Beginner Seasoned
Pick your zone and the dates re-calibrate.
The Guide Crops Vol. 003

Slicing Cucumber

in Zone 9, this week

The slicing cucumber is the classic salad cucumber you eat fresh, long, smooth, and dark green, rather than one you turn into pickles. It is an easy, fast summer vegetable that grows as a long vine or a compact bush and makes a lot of fruit in a short time. Pick the cucumbers while they are young and shiny, around 6 to 8 inches; if you leave one on too long it gets fat, yellow, and seedy, and the plant stops making more. Growing the vines up a trellis keeps the long fruit straight and clean and helps the plant stay healthy. The slicing cucumber is the standard American salad cucumber, a fast warm-season cucurbit (Cucumis sativus) grown for long, smooth, dark-green fruit eaten fresh rather than pickled. Vines are vigorous and tendrilled, running long or forming compact bushes, and they crop heavily over a short summer window once soil and air warm. Slicers are picked young, at about 6 to 8 inches, while the skin is glossy and the seeds soft; a slicer left on the vine goes fat, seedy, and yellow, and new set slows. Most garden slicers are monoecious open-pollinated standards such as Marketmore 76 and Straight Eight, though gynoecious hybrids and seedless parthenocarpic types are widely sold. Grown up a trellis, the long fruit hangs straight and clean and the foliage stays drier against disease.

Slicing Cucumber mature plant
Fig. 01 · Slicing Cucumber, mature Zone 9
Mature in
55-70d
from transplant
Sunlight
Full sun
6-10 hrs daily
Water
Moderate
1 inch / week
Spacing
24 in
between plants
Soil pH
6-6.5
slightly acidic
Today · in your zone

What's happening right now

October 21 · Zone 9 · Stage 01 · Germination

Off-season for slicing cucumber in zone 9.

Seasoned
Microclimate · Zone 9a vs 9b

Your zone, at a finer grain

Zone 9 averages a last frost around March 1. Within Zone 9, the colder half (9a, winters down to 20°F) runs about a week later. The warmer half (9b, winters down to 25°F) runs about a week earlier. The plant app picks your subzone from your ZIP.

SubzoneLast springFirst fallGrowing daysWinter minFruits reliably
9aMar 8Nov 24~26120-25°FYes · two seasons
9bFeb 28Nov 30~27525-30°FYes · two seasons

Averages from 8 weather stations per subzone, drawn from NOAA 1991-2020 Climate Normals. Your actual frost date can vary by up to two weeks based on elevation, proximity to water, and local topography.

Source: NOAA 1991-2020 Climate Normals Methodology
Your climate region in Zone 9
The season at a glance

Planting calendar

In Zone 9, slicing cucumber can be planted March through July. Start indoors Feb 15 - Mar 15. Harvest runs May through November.

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
plant
too cold
indoors
plant
plant
plant
plant
plant
too late
too late
too late
too early
too cold
harvest
harvest
harvest
harvest
harvest
harvest
harvest
harvest
indoors
plant out
harvest
Seasoned
Stagger your sowings

Succession planting

Slicing cucumbers produce heavily for a few weeks, then slow down, so plant a few seeds now and a few more about three weeks later for a steadier supply. A second planting in summer is a smart backup, since pests and mildew often wear out the first plants by late summer.Slicing cucumbers crop hard for a few weeks and then tire, so succession sowing keeps the supply steady instead of feast-then-famine. A first sowing after your last frost, then a second about three weeks later, spreads the harvest and keeps vigorous plants coming as the originals fade. The real payoff is late season: cucumber beetle, bacterial wilt, and powdery and downy mildew often take down the first planting by midsummer, so a replacement sown in early to midsummer, counting back from your first fall frost so it has time to mature, frequently outproduces the spring crop on cleaner, less stressed plants.

Every 3 weeks · sow a short new rowUp to 12 sowings a season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
sow
harvest
keep sowing
continuous harvest
The season, mapped

Seed to garden

The easiest way to grow slicing cucumbers is to sow seeds right where they will grow, once the soil is warm (about 70°F). Plant a few seeds 1 inch deep in each spot and keep the strongest. Start seeds indoors only if your season is short, about three weeks before planting out, ideally in peat pots you can plant whole, and move them outside while they are still small.Because cucurbits resent root disturbance, direct sowing once the soil is reliably warm (at least 70°F at 1 inch; seed will not germinate below about 50°F) is the simplest, most reliable method, and direct-sown slicers quickly catch up. Sow several seeds about 1 inch deep per hill or station and thin to the strongest. Start seeds indoors only to gain two to three weeks in a short season, sowing in peat pots three to four weeks before planting out and setting them out before they outgrow the pot.

  1. 01
    Sow indoors →
    Feb 15 - Mar 15
    Start about 3 weeks before your last frost
  2. 02
    Transplant out →
    Mar 15 - Jul 1
    After hardening off
  3. 03
    First harvest
    From May 17
    55-70 days from transplant
Start method
Both
Soil temp
70-95°F
Hardening off
7-10 days
If you started seedlings indoors, set them outside for a little longer each day over about a week so they get used to sun and wind. Be gentle with the roots when you plant, since cucumbers do not like having their roots disturbed. Peat pots you can plant whole help a lot.
From seed to fruit

The growing journey

Stage 01 · Germination
01
Germination
Days 3-10 · current stage
In warm soil, seeds sprout in about a week. Two seed leaves push up first. If the soil is cold, seeds rot instead of sprouting.Seeds sprout in about 4 to 10 days in warm soil (70 to 95°F is ideal); cold soil below about 50°F rots seed rather than germinating it.
Plant seeds 1 inch deep once the soil is warm. Keep the soil damp until they sprout. If several come up together, keep the strongest one.Sow 1 inch deep in warm soil, keeping it evenly moist but not soggy. If you sowed several seeds per spot, thin to the strongest seedling once true leaves appear.
FROM PLANT · Wait for warm soil before sowing. Cucumber seeds rot in cold ground but sprout fast once it warms up.Soil temperature, not the calendar, governs cucumber germination. Wait until soil is at least 70°F at 1 inch; seed sown in cold ground below about 50°F rots before it sprouts.
02
Seedling
Days 10-21
After the first two rounded leaves, true leaves appear and the plant grows quickly. Watch for striped or spotted beetles chewing the young leaves.Cotyledons followed by the first true leaves; growth is fast once warm. Watch for cucumber beetles, which target young plants and can transmit bacterial wilt, to which slicing cucumbers are very susceptible.
Keep an eye out for beetles on young plants. Set up a trellis now if your cucumbers climb. Water regularly and keep weeds down. A light row cover protects seedlings, but remove it once flowers form.Protect from cucumber beetles, with row cover if needed (remove it at flowering for pollination). Get a trellis up early for vining types, and keep the plants evenly watered and weed-free.
FROM PLANT · Protect young plants from beetles. A light cover helps, but take it off once flowers appear so bees can reach them.Cucumber beetles swarm young plants and spread bacterial wilt, which slicing cucumbers catch easily. A floating row cover protects seedlings, but pull it off at flowering so bees can pollinate.
03
Established and vining
Days 21-35
The plant grows fast, sending out vines and curling tendrils that grab onto a trellis. This is when you feed it and make sure it has something to climb.Rapid leafy growth and lengthening vines that throw tendrils and begin to climb. This is the window to side-dress and to get the trellis in place before the long vines sprawl, and to keep scouting for beetles and aphids.
Give the plant a light feeding of nitrogen now. Guide the vines onto their trellis. Add mulch to keep the soil evenly moist, which keeps the fruit from going bitter.Side-dress lightly with nitrogen as flowering nears. Train vines onto the trellis so the long fruit will hang straight. Mulch to hold even moisture, which prevents bitterness, and keep scouting for cucumber beetles and aphids.
FROM PLANT · Give your cucumbers something to climb. Grown up a trellis, the long fruit is straighter and cleaner and the plant gets less disease.Get the trellis in early. Slicing cucumbers grown up a trellis make straighter, cleaner fruit, dry faster, suffer less disease, and are far easier to pick than sprawling vines.
FROM PLANT · Keep the soil evenly moist and mulched. Letting cucumbers dry out, then soaking them, is what makes them taste bitter.Even moisture is the anti-bitterness habit. Mulch and water steadily; the drought and heat swings that stress the plant are exactly what drive the bitter compound into the fruit, worst at the stem end and skin.
04
Flowering
Days 32-48
Yellow flowers open. The first flowers are usually male and fall off, which is normal. Female flowers have a tiny cucumber at their base.Yellow flowers open. Most slicing cucumbers are monoecious, so male flowers (on thin stalks) usually open first and drop, which is normal; female flowers carry a tiny cucumber behind the bloom. Gynoecious and parthenocarpic types behave differently.
Let the bees do their work and do not spray the flowers. If tiny cucumbers turn yellow and shrivel, the flowers were not pollinated, and you can hand-pollinate with a small brush. Keep watering steadily.Encourage pollinators and avoid spraying open blooms, since fruit set depends on repeated bee visits. If small fruit yellow and shrivel, pollination is poor; hand-pollinate in the morning. Keep moisture steady now to avoid bitterness.
FROM PLANT · The first flowers often fall off without making cucumbers, that is normal. Real trouble is when tiny cucumbers turn yellow and shrivel, which means poor pollination.Early male flowers opening and dropping with no fruit is normal; females, each with a tiny cucumber behind the bloom, come a little later. Judge pollination by whether small fruit size up or yellow and shrivel.
FROM PLANT · If cucumbers are not forming, you can hand-pollinate. In the morning, pick a male flower, peel off the petals, and gently touch it to the center of a female flower.If set is poor in cool or pollinator-scarce conditions, hand-pollinate in the morning: pick a male flower, strip the petals, and dab pollen onto the center of each open female. Parthenocarpic types skip this entirely.
05
Harvest
Days 55-70
Shiny, firm cucumbers reaching about 6 to 8 inches. They grow fast, so they are ready before you expect.Glossy, firm, deep-green fruit reaching slicing size, about 6 to 8 inches for most varieties, sizing up fast, often noticeably bigger day to day at peak.
Check every day or two and pick the cucumbers while they are firm and shiny. Cut the stem rather than pulling. Picking often keeps more coming, and remove any big yellow ones you missed.Pick every 1 to 2 days, cutting or clipping the stem. Harvest young for tenderness and to keep the plant producing; remove any oversized or yellowed fruit you missed, since they shut down new set and turn bitter.
FROM PLANT · Pick cucumbers while firm and shiny and check every day or two, they grow fast. Picking often keeps more cucumbers coming.Pick young and pick often. At peak, slicing fruit sizes up fast, so check every 1 to 2 days; harvesting promptly keeps the plant setting new fruit instead of slowing down, and young fruit is the most tender.
FROM PLANT · If a cucumber got big and yellow, pick it off anyway. Leaving over-ripe fruit on the plant makes it stop producing.Missed one and it turned yellow and seedy? Cut it off and compost it; leaving mature, seedy fruit on the vine tells the plant to stop setting, and over-ripe slicers turn bitter anyway.
06
End of season
Days 75-110
The plant slows down and the leaves may get powdery and white or yellow and spotted, or it wilts suddenly from disease. Frost kills it.Declining production, spreading powdery or downy mildew, or sudden wilting from bacterial wilt. The first frost kills the plant outright.
Pull out finished plants and clear them away at the end of the season. This helps prevent pests and disease next year. A second planting made in summer often keeps producing after the first one is done.Pull and remove spent vines rather than tilling them in, to cut overwintering pest and disease sites. A summer-sown succession often crops cleanly after the first planting fades to mildew or wilt.
FROM PLANT · At the end of the season, pull up old vines and clear them away. This cuts down on pests and disease next year.Pull spent vines and remove them rather than tilling them under, which buries overwintering beetles and disease residue. Clean beds now mean fewer pests and less angular leaf spot and anthracnose next season.
Beginner
Know your soil

Your soil

Identify yours

Not sure what soil you have? Grab a small handful of damp soil from your garden bed and squeeze it. If it crumbles apart easily, it's sandy. If it holds together but breaks when you poke it, it's loam (what most vegetables want). If it stays in a hard, slippery ball, it's clay.

What this crop wants

Plant slicing cucumbers in rich, well-drained soil with plenty of compost mixed in. They grow fast and have shallow roots, so they like soil that stays evenly moist but never soggy, which also keeps the fruit from tasting bitter. Many gardeners plant them on low hills or mounds that warm up quicker and drain better, and growing them up a trellis keeps the long fruit clean and straight. If your soil is heavy or stays wet, build up mounds or use raised beds so the roots do not sit in water.

What's a hill? A hill is a small group of seeds planted together in one spot. Once the seedlings come up, you remove the weaker ones and keep the strongest one to three plants. Snip or pinch off the extras instead of pulling them, so you don't disturb the roots of the plants you keep. Some guides raise the soil into a low mound for each hill so extra water drains away. Others treat a hill as just the group of plants, with no mound. The distance between hills is measured from one planted group to the next.

If your soil doesn't match

You have sandy soil

Mix 2-3 inches of compost into the top 6 inches of your bed before planting. Compost holds moisture (which sandy soil drains too fast) and adds the nutrients sandy soil tends to lack. Repeat each season. Compost breaks down over time.

You have clay soil

Mix 2-3 inches of compost AND a few inches of coarse sand or perlite into the top 6 inches of your bed. The compost feeds the plants; the sand breaks up the clay so air and water can move through. Don't add sand without compost. It can compact like concrete.

Containers and raised beds

If amending your soil sounds like too much work, or if your soil is heavy clay, full of rocks, or contaminated, build over it. A raised bed at least 12 inches deep filled with a 50/50 mix of compost and sandy loam gives you ideal growing soil with no battles. A 5-gallon container with quality potting mix does the same for one plant at a time. Both bypass your native soil entirely.

Learn more about your soil
The specs

Care guide

The numbers that matter, at a glance.

Sunlight
Full sun · 6-10 hrs/day
Water
moderate
Spacing
24 inches
Soil
loam
Days to maturity
55-70 days from transplant
Soil pH
6 to 6.5
Container OK?
Yes · 5+ gal pot
Germination temp
70-95°F
In a pot

Yes, 5 gallons and up

Slicing cucumbers grow well in a container if you pick a compact or bush variety and give it a big enough pot, at least 5 gallons and 12 inches deep, with a small trellis or cage for the vines. Put it in full sun, keep it well watered (pots dry out fast, and dry cucumbers turn bitter), and feed it regularly. Water the soil, not the leaves, to help avoid mildew.Slicing cucumbers are one of the better container cucurbits, especially compact or bush types such as Spacemaster, Bush Champion, or Salad Bush, and the parthenocarpic types that fruit without pollinators suit a balcony well. They still want a real pot: at least 5 gallons and 12 inches deep, larger is better, with a trellis or cage so the vines climb and the long fruit hangs straight. Give it full sun, water at the base daily in heat (a dry pot makes bitter fruit), and feed regularly, since a small soil volume dries and depletes fast over the short, fast season. The container figures here follow general container-vegetable guidance; cucumber-specific container numbers are modeled.

Pot size
5 gallons and up; 10 gallons is comfortable
Drainage
Drainage holes are a must. Skip the gravel layer. If you use a saucer, empty it after watering. Cucumbers will not tolerate sitting in standing water, which invites root and stem rot.
Watering
Pots dry out much faster than garden beds. In summer a potted cucumber may need water every day, sometimes twice. Check daily and water until it drains from the bottom, since drying out makes cucumbers bitter.Containers dry far faster than beds, and a cucumber in a pot can need water once or even twice a day in summer heat. Check daily by feeling the top inch of mix, and water until it runs from the drainage holes; even moisture prevents the bitter, misshapen fruit that water swings cause.
Depth and shape
At least 12 inches deep. A container slicing cucumber needs a deep, sturdy pot, at least 12 inches deep and 5 gallons or more, with a trellis or cage so the vines climb rather than sprawl over the rim. Trellising in a pot keeps the long fruit straight and the foliage open against mildew. Choose compact, bush, or parthenocarpic types for containers rather than long sprawling vining kinds.
Self-watering pot
Yes. A self-watering container suits a potted slicing cucumber well, smoothing the moisture swings this thirsty, bitterness-prone plant dislikes. Keep the reservoir topped up in heat, still water from below to keep foliage dry, and use a large enough planter that the roots are not constantly waterlogged.
Mix
Use a rich, free-draining peat- or coir-based potting mix, not garden soil, which compacts and drains poorly in a container. Blend in about a third compost plus a slow-release balanced fertilizer at planting. Because frequent watering flushes nutrients, plan to feed a container cucumber more regularly than one in the ground.
Feeding
Feed container cucumbers more often than in-ground ones, since steady watering leaches nutrients. After the slow-release charge at planting, add a balanced liquid feed every 2 to 3 weeks, keeping nitrogen moderate once fruit sets.
One to try

SpacemasterCompact bush slicer on short vines; one of the best choices for containers and small beds while still yielding full-size fruit.

4 more compact types

Bush Champion

Salad Bush

Patio Snacker

Fanfare

Pot safety

Ask what your balcony or roof can carry

A balcony or roof can only hold so much weight. Before you set heavy pots there, ask a building architect what it can safely carry.Illinois Extension's guidance is to consult a building architect about weight limits before placing heavy pots on a balcony or rooftop garden. It gives no weight figure.

Never grow food in a container with anything toxic in it

Many kinds of containers can be used. Whatever you choose, keep anything toxic out of it, especially if you are growing food.Colorado State accepts nearly any container material but warns against using a container that holds toxic materials, especially for edible plants. Illinois adds that a vegetable container should be free of chemicals toxic to plants or people, and urges caution with treated lumber when growing food. If you cannot account for what a repurposed container once held, that alone is a reason to keep food out of it.

Secure hanging containers well

Fasten hanging baskets and window or rail boxes securely. Think about what is below them too, since they can drip on people or things underneath.Illinois Extension asks growers to secure hanging containers well and to think through the safety issues of hanging them. Placement matters too, since a hanging container can drip onto people or belongings below.

Soil chemistry

Soil pH for slicing cucumber

Preferred
6 to 6.5
Tolerated
5.5 to 7

Slicing cucumbers like soil that is slightly acidic to neutral, about pH 6.0 to 6.5, and most garden soil is already close. An inexpensive soil test tells you where you stand and whether you need to adjust before planting.Slicing cucumbers do best in slightly acidic to near-neutral soil, about pH 6.0 to 6.5. They still crop across a wider band, roughly 5.5 to 7.0, but nutrient uptake tightens as the soil turns alkaline. Test before planting, and lime or add sulfur only on the test's advice rather than by guess.

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Steady hand on the hose

Watering

When & how much
Frequency
Give slicing cucumbers about 1 inch of water a week, more when it is hot and dry. Water deeply rather than a little every day, and try to keep it steady so the fruit does not turn bitter.Aim for about 1 inch of water per week, more in heat or sandy soil, delivered deeply and less often rather than in light daily sprinkles. Even, steady moisture is what keeps slicing cucumbers from turning bitter and misshapen.
Amount
About 1 inch of water a week is a good target, more while the plant is flowering and the cucumbers are growing. Cucumbers are mostly water, so do not let them dry out.Around 1 inch per week is the working range, leaning higher during flowering and fruit sizing and through hot, dry spells. Cucumbers are over 95 percent water and have shallow roots, so they show drought stress fast: uneven or short water gives bitter, pinched, or curled slicing fruit.
Method
Water the soil, not the leaves, using a soaker hose or watering wand at the base. Keeping the leaves dry helps prevent the leaf diseases cucumbers are prone to, and a layer of mulch keeps the soil evenly moist so the fruit stays sweet.Water at the base with drip or a soaker hose, keeping the foliage as dry as possible, since wet leaves invite powdery and downy mildew and angular leaf spot on an already disease-prone crop. A 2 to 3 inch mulch holds soil moisture even, which directly reduces bitterness, and keeps soil from splashing onto the leaves.
Signs of trouble
Too much water
If lower leaves yellow, the plant wilts even though the soil is wet, or the base gets soft and mushy, it is getting too much water or the soil drains poorly.Yellowing lower leaves, wilting even when the soil is wet, and soft, rotting stems at the base point to overwatering or poor drainage. Saturated soil invites root and fruit rot, especially on heavy ground.
Too little water
Some midday wilting in hot weather is normal and passes by evening. Leaves that stay wilted mean the plant is too dry, and drought while fruit is forming gives bitter, misshapen cucumbers.Midday wilting that recovers overnight is normal in heat, but leaves that stay limp and dull signal real drought. The clearest fruit-stage tell is bitter, pinched, or curled slicing cucumbers, which trace directly to inadequate or uneven water during sizing.
Feeding rhythm

Feeding

Frequency
At planting, then side-dress once or twice
Type
balanced at planting, then nitrogen side-dress
When to start
Work into the bed before planting, then side-dress about a week after flowering begins and again 3 weeks later

Slicing cucumbers grow fast and need a moderate amount of feeding, not a lot. Mix a balanced fertilizer or compost into the soil before planting, then feed with a little nitrogen about a week after the flowers start, and again a few weeks later if the plants look pale. Do not overdo the nitrogen, since too much makes leafy vines instead of cucumbers. Keep the plants evenly watered too, because feeding only helps a well-watered plant.Slicing cucumbers are moderate feeders over a short, fast season. Work a balanced fertilizer or several inches of compost into the bed before planting, then side-dress with a little nitrogen about a week after flowering starts and again roughly three weeks later if the plants look pale. The classic pitfall is too much nitrogen, which drives lush vine and leaf at the expense of fruit and pulls in aphids and disease. Pair feeding with steady, even moisture, because the nutrients only help a plant that is not also drought-stressed, and drought stress is exactly what turns a slicing cucumber bitter.

N · P · K = 5-10-10

Use a balanced or low-nitrogen fertilizer, such as 5-10-10, at planting, then a little nitrogen once flowers appear. Avoid high-nitrogen lawn fertilizer.A modest starter such as 5-10-10 worked in at planting suits slicing cucumbers, followed by a light nitrogen side-dress once they flower. Avoid high-nitrogen lawn-type fertilizers, which push foliage at the expense of fruit.

Try balanced 5-10-10 at planting, then a nitrogen source such as blood meal
Who grows well together

Companion planting

The most useful slicing cucumber companions are flowers that bring in bees, since cucumbers need bee visits to set fruit, plants like radish and nasturtium that lure pest beetles away, and beans that feed the soil. Sunflowers or corn can act as a natural trellis. The one rule that really matters is to keep cucumbers away from other squash, melons, and pumpkins, which all share the same pests and diseases. Slicing cucumber companions earn their place by drawing pests off, bringing in bees, or feeding the soil, not by crowding the bed. Give the long vines room or a trellis and use companions as a border or light interplanting. The signature pest is the cucumber beetle, which also vectors bacterial wilt, so radish and nasturtium are traditionally interplanted to lure or deter beetles, and a row of sunflowers or corn can double as a living trellis and windbreak. Because slicing cucumbers are insect-pollinated, flowers like borage and dill keep bees working the blooms and help the long fruit fill out. Beans fix nitrogen for the moderately hungry vines. Most of these pairings are traditional or mechanistic rather than trial-proven, and are labeled accordingly. The firmest rule is a rotation one: keep cucumbers away from other cucurbits, which share the whole pest and disease complex.

Other
Radish
Radishes are often planted among slicing cucumbers to lure cucumber beetles, the cucumber's worst pest, away from the vines. They grow fast and are pulled before they crowd anything. A popular, low-risk traditional pairing.A long-standing trap and deterrent planting for cucumber beetles, the pest that also spreads bacterial wilt to highly susceptible cucumbers. Radishes are quick, cheap, and gone before they compete, an easy interplant even though the beetle-reduction effect is traditional rather than trial-isolated. Traditional
Nasturtium
Nasturtiums lure cucumber beetles and aphids away from cucumbers, and their flowers bring in bees. An easy, edible-flowered neighbor.Often planted near cucurbits to trap and deter cucumber beetles and aphids, and its flowers draw the bees slicing cucumbers depend on for fruit set. Trap cropping is a documented principle, but the specific nasturtium-cucumber effect is not formally isolated, so treat it as a plausible aid. Well-grounded
Beans
Beans pull nitrogen from the air into the soil, which the fast-growing cucumber appreciates, and they do not share its pests. A good, traditional neighbor.Pole or bush beans fix nitrogen that benefits the moderately heavy-feeding cucumber, and they share none of the cucurbit pests. Most of the nitrogen reaches neighbors after the beans break down, so treat it as season-long soil-building rather than an instant feed, but the mechanism is sound. Well-grounded
Sunflower
A row of sunflowers gives cucumber vines something to climb and a little shade, and the blooms bring in bees. A practical, traditional support plant.Tall sunflowers can serve slicing cucumbers as a living trellis and light windbreak, lifting the long vines off the ground for cleaner, straighter fruit and better airflow, while their flowers recruit pollinators. The structural benefit is real and practical; the pairing is traditional rather than a measured yield effect. Traditional
Borage
Borage flowers are loved by bees, and cucumbers need bee visits to set fruit, so a few borage plants nearby can help pollination. Mainly grown to bring in bees.A strong bee magnet whose flowers recruit the pollinators slicing-cucumber fruit set depends on, since each female flower needs repeated bee visits to size a full-length fruit. Pollinator-habitat value is well grounded; the specific borage-cucumber pairing is traditional rather than trial-tested. Well-grounded
Herb
Dill
Dill flowers draw hoverflies, lacewings, and parasitic wasps that prey on aphids, and it is a classic kitchen partner for cucumbers. The beneficial-insect draw is mechanistically sound; the specific cucumber pairing is traditional. Let some plants flower for the benefit. Well-grounded
interplant nearby
Keep apart from
Other cucurbits Keep slicing cucumbers away from other squash, melons, and pumpkins. They all get the same pests and diseases, so planting them together makes those problems worse.Summer and winter squash, melon, and pumpkin share the slicing cucumber's whole pest and disease complex, including cucumber beetle with the bacterial wilt it spreads (to which cucumber is especially susceptible), squash bug, powdery and downy mildew, angular leaf spot, and anthracnose. Grouping them concentrates that pressure and lets problems build. A real epidemiology and rotation principle rather than a tested adjacency effect: spread cucurbits out and rotate them. Well-grounded
Potatoes Some gardeners keep potatoes and cucumbers apart, since both are hungry plants and potatoes can bring their own diseases. This is more tradition than a proven rule.A traditional caution that potatoes and cucumbers compete for the same nutrients and that potatoes can harbor blight and attract pests near the vines. There is no strong T1 mechanism for the specific pairing, so it persists mostly as garden lore. Traditional
Provenance tagged inline · see methodology for the labeling system Key
Harvest signals

When to pick

Pick slicing cucumbers while they are young, firm, shiny, and deep green, usually around 6 to 8 inches long. The exact size is up to you, but younger cucumbers are more tender. Cut or clip the stem instead of pulling, so you do not tear the vine. Check every day or two, because cucumbers grow fast and one left too long turns yellow, seedy, and bitter while the plant slows down.Pick slicing cucumbers young, while the skin is glossy and firm, the color deep green, and the seeds still soft, generally at about 6 to 8 inches for the variety. Earlier is more tender; a slicer left to over-size dulls, yellows at the tip, turns bitter and seedy, and tells the plant to stop setting. Cut or clip the stem rather than pulling, to spare the brittle vine. At peak in warm weather the fruit sizes up fast, so check every 1 to 2 days and pick often to keep new fruit coming.

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Yield

What to expect

One slicing cucumber plant produces a lot over the season, often a dozen or more cucumbers. Two or three plants are plenty for fresh eating.A healthy slicing plant yields heavily over its short season, commonly 10 or more full-size cucumbers per vine, often 5 pounds or more in a long, warm climate. A few plants are plenty for fresh salad use; scale up only if you want a steady daily supply.

At its peak, a cucumber plant makes fruit fast. Pick every day or two, since picking often actually keeps more cucumbers coming.At peak in warm weather a plant sets fruit quickly, and slicers size up so fast that picking every 1 to 2 days is essential. Frequent harvest at this stage actually keeps the plant producing; leaving a mature, seedy fruit on the vine signals it to slow down or stop. Slicing cucumber is one of the easier crops for beginners. The two things that catch people out are bitter fruit from letting the plants get dry, and plants suddenly wilting from a beetle-spread disease. Water steadily and watch for beetles early.Slicing cucumber is forgiving and productive even for a first-time grower; the usual first-year surprises are bitterness from letting the plants dry out, and a sudden mid-season collapse from beetle-spread bacterial wilt. Steady water and early beetle control head off both.

What changes yield
Even moisture: steady water through fruit set drives sweet, well-formed slicers; drought and heat swings cause bitterness and misshapen fruit.Harvest frequency: picking young and often keeps a plant productive; letting fruit oversize and seed-up slows or stops new set.Pollination: poor pollination in cool or pollinator-scarce conditions causes small fruit to abort; parthenocarpic types are exempt.Pest and disease pressure: cucumber beetle and the bacterial wilt it vectors, plus powdery and downy mildew, commonly end the first planting.Season length and heat: warm seasons extend the productive window, but extreme heat stalls set and drives bitterness; a frost ends it.
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Pick your variety

Recommended varieties

Pick a slicing cucumber to match your garden. Marketmore 76 and Straight Eight are dependable all-rounders for fresh eating, Poinsett 76 and Ashley handle hot, humid weather and disease better, and burpless or seedless types like Sweet Slice and Sweet Success are mild and easy to digest. If you only have a pot or a small bed, choose a compact bush type like Spacemaster. Disease-resistant varieties are worth seeking out, and milder, less-bitter kinds also attract fewer pest beetles.Choose a slicing cucumber by climate and space. Marketmore 76 and Straight Eight are the reliable open-pollinated, monoecious standards, while Poinsett 76 and Ashley are bred for the disease pressure of humid Southern heat. Gynoecious hybrids like Dasher II set heavily but usually want a pollenizer plant nearby, and burpless or parthenocarpic types such as Sweet Slice and Sweet Success are mild, thin-skinned, and, in the seedless kinds, fruit without bees, which suits covered and container growing. Compact bush types like Spacemaster fit small beds and pots. Where disease pressure is high, lead with mildew- and wilt-tolerant varieties, and remember that less-bitter varieties also attract fewer cucumber beetles.

Marketmore 76
The standard open-pollinated slicing cucumber: straight, dark-green, 8 to 9 inch fruit on disease-tolerant, monoecious vines, about 65 days. Bred at Cornell, dependable and widely adapted, with resistance to several common diseases.
Straight Eight
Classic heirloom slicer with straight, smooth 8 inch fruit in about 58 days; an All-America Selections winner and a reliable garden standard.
Poinsett 76
Open-pollinated slicer, about 63 days, bred for hot, humid regions with resistance to downy and powdery mildew, anthracnose, and angular leaf spot.
Dasher II
Gynoecious (nearly all-female) hybrid slicer, about 58 days, very dark green and high-yielding with good disease tolerance; sets heavily but appreciates a pollenizer in the row.
Sweet Slice
Burpless hybrid with long, mild, thin-skinned fruit that is gentle on digestion; best trellised so the long slicers hang straight.
Sweet Success
Parthenocarpic (seedless, burpless) hybrid slicer, an All-America Selections winner that sets long, thin-skinned, bitter-free fruit without pollination; excellent under cover or in containers.
Ashley
Southern heirloom slicer developed at Clemson, about 65 days, tolerant of downy mildew and productive in humid heat.
Spacemaster
Compact bush slicer on short vines; one of the best choices for containers and small beds while still yielding full-size fruit.
Off the vine

Storing your harvest

Room temp
Slicing cucumbers do not keep long at room temperature, just a day or two. Use them soon or put them in the fridge, but not the coldest part.Slicing cucumbers are tender and short-lived off the vine. At room temperature they keep only a day or two before softening, so use them quickly or refrigerate, with the caveat that cucumbers are chilling-sensitive and do not love a very cold fridge either.
Fridge
Keep slicing cucumbers in the fridge for about a week, in the warmer crisper drawer rather than the coldest spot, since too-cold storage causes soft, pitted spots. Keep them away from apples and tomatoes, which make them go bad faster.Stored in the warmest part of the refrigerator, ideally around 45 to 50°F at high humidity, slicing cucumbers keep about a week. They are chilling-sensitive below about 50°F, where prolonged cold causes pitting, water-soaked spots, and faster breakdown, so they store neither as long nor as cold as hardy vegetables. Keep them away from apples, tomatoes, and other ethylene producers, which hasten yellowing.
Freezer
Slicing cucumbers do not freeze well, since they are mostly water and turn mushy. The best way to keep extra cucumbers is to eat them fresh, share them, or make quick pickles.Slicing cucumbers do not freeze well for fresh use, turning limp and watery because of their high water content. A glut is better kept by quick-pickling; freezing is only worth it for blended uses like soups or smoothies.
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From the garden to the kitchen

Recipes to try

Preserves & Condiments

Tzatziki

Preserves & Condiments · 10m · Serves 6
Salads

Cucumber & Dill Summer Salad

Salads · 10m · Serves 4
Smoothies

Cucumber & Mint Cooler

Smoothies · 5m · Serves 2
More recipes
arriving with the harvest
When something goes wrong

Common problems

The cucumbers were bitterSlicing cucumbers tasted bitter
01 of 04
What happened The plant got stressed, usually by hot, dry, or uneven conditions, which makes cucumbers bitter. The bitterness sits mostly in the skin and the stem end.Stress, usually heat or uneven water, drove up the plant's natural bitter compound (cucurbitacin), which concentrates in the skin and at the stem end. Wide temperature swings, drought, and poor nutrition all bring it on, and some varieties are inherently more bitter than others. Next season Keep the plants evenly watered and mulched so they do not dry out, pick the cucumbers young, and try a burpless or non-bitter variety. Peeling and cutting off the stem end takes most of the bitterness out.Water steadily and mulch to keep soil moisture even, harvest before fruit oversizes, and grow non-bitter or burpless varieties. Peeling and cutting off the stem end removes most of the bitterness from a fruit you have already picked.
Tiny cucumbers turned yellow and shriveledSmall fruit yellowed and shriveled instead of sizing up
02 of 04
What happened The flower was not pollinated well, so the little cucumber died instead of growing. This often happens in cool or rainy weather, or when there are few bees.Poor pollination. Each female cucumber flower needs several bee visits to set; without enough pollen the young fruit aborts, yellowing and shriveling at the tip rather than sizing up. Common in cool, wet, or pollinator-scarce conditions and early in the season. Next season Grow some flowers nearby for the bees, and hand-pollinate early cucumbers if needed. It usually gets better as more flowers open and bees get active, or grow a seedless variety that does not need bees.Plant flowers to draw pollinators, avoid spraying open blooms, and hand-pollinate in the morning if early set is poor. Parthenocarpic varieties set fruit without pollination and sidestep the problem entirely.
Plant suddenly wilted and diedHealthy vine wilted and collapsed in midsummer
03 of 04
What happened Usually bacterial wilt, a disease cucumber beetles spread that cucumbers catch easily. It clogs the plant's water pipes so the vine wilts even when watered. Cut a wilted stem and pull it apart slowly to see sticky white strings.Most likely bacterial wilt, to which slicing cucumbers are highly susceptible: cucumber beetles infected the plant, and the bacterium clogged its water-conducting tissue, collapsing a previously vigorous vine. The sap-string test confirms it. Squash bug feeding can cause similar wilting. Next season Keep cucumber beetles down, since they spread the disease there is no cure for. Cover young plants until they flower, and pull any plant that wilts and shows the sticky-string sign.Control cucumber beetles from the seedling stage with row cover until flowering, keep young plants vigorous, grow less-bitter varieties that draw fewer beetles, and remove infected plants promptly. There is no cure once a plant is infected.
Leaves got white and powdery and the plant died backLeaves turned white and powdery, then the plant faded early
04 of 04
What happened Powdery mildew, a white coating on the leaves, spread until the leaves died and the plant stopped early. Downy mildew, with yellow patches and fuzzy gray undersides, does similar damage in damp weather.Powdery mildew defoliated the plant ahead of schedule. The white fungal coating spread across the leaves until they browned and died, cutting the productive season short and exposing fruit to sunscald. Downy mildew (yellow vein-bounded blotches with gray underside) does the same in humid weather. Next season Pick resistant varieties, give plants room and a trellis for air flow, water the soil not the leaves, and treat early spots. A second planting helps too.Choose resistant varieties, space and trellis plants for airflow, water at the base, and treat at the first spots. A summer-sown succession can carry harvest past the worst of it.
The usual suspects

Pests & diseases

Pests
Cucumber beetles
P · 01
Symptoms Small yellow beetles with stripes or spots chew the leaves and flowers, especially on young plants. Worse, they spread bacterial wilt, a disease that makes cucumber vines suddenly wilt and die.Small yellow beetles, striped (three black stripes, Acalymma vittatum) or spotted (eleven black spots, Diabrotica undecimpunctata howardi), chew young leaves, stems, flowers, and the skin of slicing fruit. The bigger threat is indirect: both kinds transmit bacterial wilt, to which cucumbers are highly susceptible, so beetle feeding on seedlings can be followed weeks later by sudden, runaway vine wilt and collapse. Cause Cucumber beetles feed on the plants and carry the germ that causes bacterial wilt, infecting cucumbers as they chew. Young seedlings are most at risk, and cucumbers catch the wilt easily.Striped and spotted cucumber beetles feed on cucurbits and carry the wilt bacterium in their gut, infecting plants as they feed; they can even enter the soil to feed on seedlings below the surface. Slicing cucumber is more susceptible to the wilt than squash or pumpkin, so even light beetle pressure on seedlings can be costly, and bitter-fruited plants attract more beetles. Organic treatment Cover young plants with row cover (take it off when flowers open so bees can get in), pick the beetles off in the morning when they are slow, and use yellow sticky traps. Keeping the beetles down is the best way to avoid the wilt disease they spread.Protect seedlings with row cover removed at flowering, hand-pick beetles in the cool morning, and set yellow sticky traps to monitor and thin numbers. Where bacterial wilt is a known problem, controlling the beetles is the only effective control of the disease, since there is no cure once a plant is infected. Prevention Cover seedlings until they flower, keep them growing strong, clear away weeds and old plants, and do not plant where squash-family crops grew last year.Exclude beetles from seedlings with row cover, keep young plants vigorous so they grow past the vulnerable stage, choose non-bitter varieties that attract fewer beetles, clear weeds and debris, and rotate away from where cucurbits grew. Aim control at the early-season colonizers that vector the wilt.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Resistant varieties

    Bitter-tasting plants pull in more beetles, so look for a variety described as non-bitter when you order seed. It is a decision you make once, before anything is in the ground.Bitter-fruited plants attract more beetles, so a non-bitter variety lowers the early colonizing pressure; a seed-order call, not an in-season one.

  2. Crop rotation

    Do not plant where squash-family crops such as squash or pumpkins grew last year. Starting in fresh ground puts distance between your seedlings and the beetles that spent the winter near the old bed.Rotating away from ground that carried cucurbits last season is the baseline; point the effort at the first colonizers of the season, the ones that deliver the wilt.

  3. Garden sanitation

    Clear weeds and spent plants from around the patch. Left standing, they give beetles cover and something to feed on right next to your cucumbers.Clearing weeds and crop debris strips shelter and alternate feeding sites adjacent to the planting, trimming the population that shows up first.

  4. Floating row cover

    Cover the seedlings with row cover, a light fabric laid over the bed, from the day they come up. Take it off once the flowers open so bees can get in.Exclusion through the seedling stage covers the window where feeding also delivers the wilt bacterium, including beetles that work below the soil surface on emerging plants; lift the cover at flowering for pollination.

  5. Handpicking

    Pick the beetles off by hand in the morning, while the cool air still has them moving slowly, and destroy what you collect.Hand-collect in the cool morning while adults are sluggish. It pays off most on seedlings, where even light beetle pressure can be costly because of what they carry.

  6. Yellow sticky traps

    Yellow sticky traps set among the plants catch beetles and show you how many are around, which tells you whether the steps above are keeping up.Sticky traps do double duty, monitoring arrival and thinning adult numbers; read them as a scouting signal rather than as stand-alone control.

No spray for this one. Prevention is the control.

Squash bug
P · 02
Symptoms Leaves get yellow spots, then brown and wilt, and you find clusters of shield-shaped gray-brown bugs and their bronze eggs on the undersides of leaves near the base of the plant.Leaves develop yellow specks that brown and wilt, and heavily fed vines wilt fast and turn brittle. Flat bronze to brick-red egg clusters appear on leaf undersides along the veins, and gray-brown adults (Anasa tristis) and pale nymphs cluster near the crown and under debris. Cause Squash bugs pierce the leaves and stems and suck out the juices, which makes the vines wilt. They breed through the summer and hide in plant debris over winter.The squash bug feeds with piercing-sucking mouthparts on cucurbit foliage and stems, injecting saliva that wilts and browns the vines. It is primarily a squash pest but will feed on cucumber; populations build through the season and are hardest to control once nymphs are large, and the adults overwinter in garden debris. Organic treatment Pick the bugs off by hand and scrape off the egg clusters under the leaves. A board laid on the ground overnight draws them underneath; lift it in the morning and destroy them. Treat the young bugs with insecticidal soap.Hand-pick adults, crush the egg masses on leaf undersides, and trap bugs by laying a board near the plants overnight, then lifting it in the morning and destroying the cluster underneath. Target young nymphs with insecticidal soap, since large nymphs and adults are tough to kill. Prevention Cover young plants until they flower, check under the leaves for eggs early in the season, and clean up old vines after harvest so the bugs have nowhere to overwinter.Use row cover on young plants until flowering, clean up vines and debris at season's end to cut overwintering sites, and rotate cucurbits. Scout leaf undersides for the bronze egg clusters from early in the season and act before nymphs mature.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Crop rotation

    Move squash-family crops to a different spot each year. Squash bugs are mainly a squash pest, though they will feed on cucumber too, so rotating breaks up the ground they build on.Rotating cucurbits denies overwintered adults a familiar bed. The primary host is squash and cucumber is a secondary one it will still feed on, which shapes how much effort this deserves.

  2. Garden sanitation

    Clean up old vines and debris after harvest. The adults spend the winter tucked into that litter, so clearing it leaves them fewer places to shelter.End-of-season removal of vines and debris cuts overwintering refuges and lowers the adult population that colonizes the following spring.

  3. Floating row cover

    Cover young plants with row cover, a light fabric laid over the bed, until they flower. Take it off at flowering so bees can reach the blossoms.Row cover on young plants blocks the first adults from laying; lift it at flowering for pollination, after which scouting takes over.

  4. Handpicking

    Pick the adults off by hand and scrape the bronze egg clusters off the undersides of the leaves. A board laid on the soil overnight draws the bugs underneath, so you can lift it in the morning and destroy the cluster you find.Hand-removal of adults plus crushing egg masses on leaf undersides is the core of it, with a board laid overnight to concentrate bugs for collection at first light. Scout undersides from early season, since control gets harder once nymphs are large.

  5. Insecticidal soap

    Insecticidal soap works on the young bugs, the small pale ones, when you spray them directly. Large ones and adults are tough to kill, so catching them young is what makes the spray worth doing.Soap is a contact material aimed at young nymphs; large nymphs and adults tolerate it, so timing to the early instars, not coverage alone, decides whether it accomplishes anything.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Aphids
P · 03
Symptoms Tiny soft insects gather on the undersides of leaves and on new growth, making leaves curl and turn yellow, often with a sticky film. They can also spread viruses to your cucumbers.Colonies of small soft-bodied insects, often melon aphid (Aphis gossypii), cluster on leaf undersides and growing tips, curling, puckering, and yellowing leaves, with sticky honeydew and sooty mold following. Beyond direct feeding, melon aphids transmit cucumber mosaic and other viruses that mottle and distort foliage and fruit and cut fruit quality. Cause Aphids are small insects that suck the plant's juices and multiply fast, especially on soft, over-fed growth. The sticky honeydew they leave behind grows black mold.Melon and other aphids suck sap and reproduce rapidly in warm weather, building fast on stressed or over-fertilized plants. The honeydew they excrete fosters sooty mold, and several aphid species spread cucumber mosaic virus. Organic treatment Blast them off with a strong spray of water and treat the undersides of the leaves with insecticidal soap, repeating every few days. Ladybugs and other helpful insects eat aphids, so welcome them.Knock colonies off with a strong jet of water and spray insecticidal soap or horticultural oil with thorough coverage of leaf undersides, repeating every few days. Conserve ladybugs, lacewings, and parasitic wasps, which usually bring aphids under control; reflective or aluminum-foil mulch deters them from young plants. Prevention Do not over-fertilize with nitrogen, check the undersides of leaves regularly, and let helpful insects do their work instead of spraying everything.Avoid excess nitrogen, which drives the soft growth aphids favor, scout leaf undersides and growing tips, and support natural enemies rather than spraying broadly. Reflective mulch deters aphids from young plants.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Balanced nitrogen feeding

    Go easy on nitrogen fertilizer. Heavy feeding pushes out soft new growth, and that is what aphids settle on first.Excess nitrogen drives the succulent flush aphids favor; restrained feeding removes the condition that lets colonies build fastest on an otherwise healthy vine.

  2. Reflective mulch

    Lay reflective or aluminum-foil mulch on the bed while the plants are still small. The bright surface discourages aphids from settling on young plants.Reflective or foil mulch deters incoming aphids while the canopy is open and plants are small, which is worth having down early given that several aphid species here also spread cucumber mosaic virus.

  3. Water spray

    Knock the colonies off with a strong jet of water from the hose, aimed at the undersides of the leaves where they gather.A forceful jet dislodges established colonies on sturdy vines and buys time before any spray; repeat as colonies rebuild.

  4. Beneficial predators

    Ladybugs, lacewings, and tiny parasitic wasps eat aphids and usually bring them under control on their own. Make room for them by not spraying broadly.Resident lady beetles, lacewings and parasitic wasps usually regulate aphid numbers; broad sprays that remove them are what let colonies run, so conserve first and keep any spray narrow.

  5. Insecticidal soap

    If colonies keep building, spray insecticidal soap and coat the undersides of the leaves thoroughly, since it kills only what it wets. Repeat every few days.Soap is contact-only, so leaf-underside coverage and repeat applications every few days carry it, with little residue standing in the way of returning natural enemies.

  6. Horticultural oil

    Horticultural oil is the other option for the same job, sprayed for full coverage of the leaf undersides and repeated every few days.Oil is an alternative contact material where soap alone is not holding; the limiting factor is identical, thorough underside coverage repeated on a several-day interval.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Spider mites
P · 04
Symptoms Tiny specks and a dusty, stippled look on the leaves, sometimes with fine webbing underneath, mostly in hot, dry weather. The leaves can dry out and die fast.Fine pale yellow and reddish-brown stippling on the upper leaf surface, often with faint webbing beneath, in hot, dry weather. Damage develops very fast: leaves bronze, dry, and drop, and a heavy infestation of two-spotted spider mite (Tetranychus urticae) can stunt or kill a plant. Cause Spider mites are tiny relatives of spiders that suck the juice from leaf cells. They love hot, dry, dusty conditions and breed very fast.Two-spotted spider mites feed on the contents of individual leaf cells and multiply explosively in hot, dry, dusty conditions, especially on water-stressed plants. They are not insects, so many insecticides do not touch them. Organic treatment Spray the undersides of the leaves with a strong jet of water, and treat with insecticidal soap, repeating in about five days. Keeping the plants watered and the area free of dust helps a lot.Knock mites off with a strong spray of water to the leaf undersides, and treat with insecticidal soap or horticultural oil twice, about five days apart, covering the undersides well. Conserve predatory mites, ladybugs, and minute pirate bugs, the main natural controls. Prevention Keep cucumbers well watered, since dry, dusty plants attract mites. Rinse the leaves in hot weather and avoid spraying broad insecticides that kill the helpful bugs.Keep plants well watered and avoid drought stress, since mites flare on dry, dusty plants. Hose down foliage in hot spells, avoid broad-spectrum insecticides that kill the mites' natural enemies, and scout leaf undersides in hot weather.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Even watering

    Keep the plants steadily watered. Mites build up fastest on plants that are dry and stressed, so not letting them go short is the first line of defense.Mites flare on drought-stressed foliage in hot, dry, dusty conditions; steady soil moisture removes the stress that drives the fastest population growth.

  2. Water spray

    Aim a strong jet of water at the leaf undersides. It knocks mites off and rinses away the dust they thrive in, and hosing the foliage down during hot spells helps as well.A forceful underside rinse dislodges mites and knocks back the dust film that favors them; treat it as a repeated habit through hot spells rather than a single pass.

  3. Beneficial predators

    Predatory mites, ladybugs, and minute pirate bugs feed on spider mites and are the main thing holding them down. Avoid broad insecticides, which kill those helpers.Predatory mites, lady beetles and minute pirate bugs are the principal natural controls here; broad-spectrum insecticides remove them, which is why they are worth avoiding even when something else is the target.

  4. Insecticidal soap

    Insecticidal soap works if you coat the undersides of the leaves well, and it takes two rounds about five days apart to catch what hatches after the first spray.Two applications roughly five days apart with thorough underside coverage. Worth remembering that mites are not insects, which is why a good many insecticides have no effect on them.

  5. Horticultural oil

    Horticultural oil does the same job as soap and goes on the same way, covering the leaf undersides and repeating in about five days.Oil on the same two-pass, five-day interval; coverage of the lower leaf surface is what decides the outcome, since both materials act only where they land.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Diseases
Powdery mildew
D · 01
Symptoms A white, powdery coating spreads over the leaves until they turn yellow and brown and die. The plant fades early and the cucumbers may not size up well.White, powdery patches spread over upper and lower leaf surfaces and stems until leaves yellow, brown, and die back ahead of schedule. Early defoliation shortens the season, cuts yield, and leaves slicing fruit exposed to sunscald. Cause A fungus that spreads on warm days with high humidity, especially where plants are crowded and air does not move well. It does not need wet leaves to take hold.Powdery mildew fungi thrive between about 50 and 90°F in dry weather with high humidity, and unlike most leaf diseases they do not need leaf wetness to infect. Crowded plantings, poor airflow, and shade worsen it, and it is one of the most common late-season cucumber diseases. Organic treatment Treat early, at the first white spots, with a labeled fungicide like sulfur or horticultural oil, and remove badly affected leaves. Water the soil, not the leaves. Once it covers the plant it is hard to stop.Treat at the first spots, before it spreads, with a labeled fungicide such as sulfur, potassium bicarbonate, neem, or horticultural oil, covering both leaf surfaces, and remove the worst leaves. Avoid overhead watering. Once it is widespread, control is mostly damage limitation. Prevention Pick resistant varieties, give plants plenty of room so air moves between them, plant in full sun, and water at the base. Start checking in midsummer and act at the first white spots.Choose resistant varieties, space plants generously for airflow, plant in full sun, and avoid excess nitrogen and overhead watering. Scout from midsummer and treat at the first sign, since prevention and early action beat rescue.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Resistant varieties

    Start with a variety labeled resistant. It takes most of the pressure off, and this disease is hard to stop once it has covered a plant.Resistant cultivars are the highest-leverage choice against a disease that ranks among the most common on cucumber late in the season, and the choice is made at seed-buying time, before anything else on this list applies.

  2. Airflow and spacing

    Give the plants plenty of room and put them in full sun. Crowded, shaded plantings where the air sits still are where this one takes hold first.Generous spacing and a full-sun site cut the crowding, shade and poor air movement that worsen infection; layout is fixed at planting and cannot be corrected later in the season.

  3. Water at the base

    Water the soil rather than the leaves. This mildew can get going without wet leaves, so this one matters less here than for other leaf diseases, but overhead watering is still worth avoiding.Skip overhead irrigation. Unlike most foliar diseases powdery mildew does not need leaf wetness to infect, so read this as a supporting habit rather than the main lever.

  4. Garden sanitation

    Pull off the worst-coated leaves as you find them. It will not clear the plant, but it takes out the heaviest patches.Removing the most heavily coated foliage lowers local inoculum, the spore load sitting in the planting; once the disease is widespread the realistic aim is limiting damage rather than clearing it.

  5. Sulfur

    Sulfur is a labeled fungicide for this. Spray at the first white spots, before it spreads, and cover both the tops and the undersides of the leaves. Waiting until the plant is coated is too late for it to do much.Sulfur is a protectant applied at first symptom with coverage on both leaf surfaces; scouting from midsummer is what makes that timing possible, since after the canopy is colonized any treatment is mostly damage limitation.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Downy mildew
D · 02
Symptoms Yellow patches show on top of the leaves, often boxed in by the veins, with fuzzy gray growth underneath in damp weather. The spots brown and spread until the leaves die. Cucumbers catch it easily.Angular yellow blotches, bounded by the leaf veins, appear on the upper surface, with grayish or purplish fuzzy growth on the underside in humid weather. Spots brown and run together, and severe infection rapidly defoliates the vines. Cucumber is one of the most susceptible cucurbits. Cause A mold-like disease that spreads in wet, humid weather and needs wet leaves to infect. It can move through a planting very quickly, and cucumbers are especially prone to it.A fungus-like water mold (Pseudoperonospora cubensis) spread on wind-borne spores that needs leaf wetness and humidity to infect, so it flares in wet, humid, dewy spells. It moves fast once established and is favored by crowding and prolonged leaf wetness. Organic treatment Open up the planting so leaves dry faster, remove the worst leaves, and use a labeled fungicide when wet weather sets in. Do not water over the leaves.Improve airflow, let foliage dry, remove badly affected leaves, and apply a labeled fungicide such as copper or chlorothalonil, covering leaf undersides, when conditions favor the disease. Avoid overhead irrigation, which keeps leaves wet and feeds the infection. Prevention Give plants room so air moves between them, water at the base, and watch closely in humid weather. Choose resistant varieties if downy mildew is common where you live.Space for airflow, water at the soil line rather than overhead, choose resistant varieties where available, and avoid working among wet vines. Scout closely in humid weather, when the disease can appear and spread quickly.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Resistant varieties

    Choose a resistant variety where one is available, especially if downy mildew turns up most years where you garden.Resistant cultivars where available. Cucumber is among the most susceptible cucurbits, so variety choice carries real weight rather than being a nicety.

  2. Airflow and spacing

    Space the plants so air moves between them and the leaves dry quickly after rain or dew. Opening up a crowded planting slows this one down.Spacing shortens the leaf-wetness periods this pathogen needs to infect; crowding and prolonged wetness are the two conditions that let it run through a planting.

  3. Water at the base

    Water at the soil line instead of over the top of the plants, and stay out of the patch while the vines are wet.Overhead irrigation sustains the leaf wetness infection requires, so water at the soil line and keep out of wet vines.

  4. Garden sanitation

    Take off the badly spotted leaves once they appear, so the plant is not carrying the heaviest infection along with everything else.Removing badly affected foliage trims inoculum, the spore load in the planting, but treat it as a supporting step: once established this one moves quickly.

  5. Copper fungicide

    A labeled copper fungicide helps when wet, humid weather sets in. Put it on as the weather turns rather than after the spots have taken over, and cover the undersides of the leaves.Copper applied when conditions favor the disease, with coverage on leaf undersides where the fuzzy growth develops; a protectant timed to humid, dewy spells rather than a rescue.

  6. Chlorothalonil Rescue only

    If downy mildew keeps moving after the copper, chlorothalonil is the other fungicide this crop's guidance names for it. Cover the undersides of the leaves, since that is the surface it has to protect, and start when the weather turns to what the disease likes rather than once the leaves are already covered. Read this one's warnings before you decide: it is the heaviest thing in this guide, and stopping at the copper is a real choice.The second material named for this disease alongside copper, and applied on the same terms: undersides covered, begun as conditions turn favorable rather than after lesions are established. Protectant only, so it defends clean tissue and does nothing for what is already infected. Weigh the method's own cautions, which are the heaviest carried by anything in this catalog, against stopping one rung lower.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Bacterial wilt
D · 03
Symptoms Vines wilt and die even though the soil is wet. If you cut a wilted stem and pull the two ends apart slowly, infected sap stretches into sticky white strings. Cucumbers get this disease easily.Individual leaves, then whole vines, wilt and collapse even though the soil is moist, often until the plant dies. A field test helps confirm it: cut a wilted stem and slowly draw the cut ends apart, and infected sap pulls into thin, sticky white strands. Slicing cucumber is especially susceptible. Cause A germ spread by cucumber beetles as they feed. It blocks the plant's water pipes, so the vine wilts even when watered. Cucumbers are very prone to it.A bacterium (Erwinia tracheiphila) spread by striped and spotted cucumber beetles, which carry it in their gut and infect plants as they feed. It clogs the water-conducting tissue, so the plant wilts despite adequate water. Cucumber and muskmelon are far more susceptible than squash and pumpkin. Organic treatment There is no cure once a plant has it, so pull and destroy infected plants. The real fix is keeping cucumber beetles down, since they spread it.There is no cure once a plant is infected; remove and destroy wilting plants to limit spread. Control is really beetle control, so management aims at keeping cucumber beetle numbers down, especially early in the season. Prevention Keep cucumber beetles under control, since they spread the disease. Cover young plants until they flower, and pull any plant that wilts and tests positive with the sap-string check.Manage cucumber beetles from the seedling stage with row cover removed at flowering, keep young plants vigorous, choose less-bitter varieties that attract fewer beetles, and remove infected plants promptly. Controlling the beetle vector is the only effective control of the disease.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Garden sanitation

    Pull and destroy any vine that wilts, once the cut-stem check confirms it: cut a wilted stem, draw the two ends slowly apart, and look for sticky white strands of sap. Nothing cures a plant that already has it, so removing it is about limiting spread.Rogue symptomatic plants as soon as the stringing-sap test confirms them. There is no cure once the bacterium is in the vascular tissue, so prompt removal limits spread rather than rescuing the plant.

  2. Floating row cover

    Cover young plants with row cover, a light fabric laid over the bed, and uncover them once the flowers open so bees can work them. Keeping cucumber beetles off the seedlings is the real defense, since they are what spread the disease.Exclusion from the seedling stage aims at the vector, which is where control actually happens: the beetles carry the bacterium and infect as they feed, so early-season protection outweighs anything attempted after symptoms show. Remove the cover at flowering for pollination.

No spray for this one. Prevention is the control.

Angular leaf spot
D · 04
Symptoms Small water-soaked spots on the leaves, bounded by the veins so they look angular. In damp weather a white crust forms underneath, and the dried spots tear out, leaving ragged holes in the leaves.Small, water-soaked spots on the leaves expand until they are boxed in by the larger veins, giving them an angular shape. In humid weather a milky bacterial ooze dries to a thin white crust on the underside, and as the spots dry they tear away, leaving ragged holes. Fruit can develop small, sunken, water-soaked spots. Cause A bacterial disease carried on seed and spread by splashing water and wet hands. It is worst in warm, rainy weather and survives the winter in old plant debris.A seedborne bacterium (Pseudomonas syringae pv. lachrymans) spread by splashing water, rain, and handling wet plants, and it overwinters in crop residue. It is most damaging in warm, wet weather, roughly 75 to 82°F with frequent rain. Organic treatment There is no cure, so remove the worst leaves, stay out of the patch when the plants are wet, and use a labeled copper spray early if it is spreading. Water the soil, not the leaves.There is no rescue spray that cures it; remove badly affected leaves, avoid working among wet plants, and apply a labeled copper bactericide at the first sign to slow spread. Water at the base to keep foliage dry. Prevention Buy clean seed and resistant varieties, water at the base, stay out of the patch when it is wet, and clean up old vines at the end of the season. Move cucumbers to a new spot each year.Plant certified disease-free seed and resistant varieties, do not work among wet vines, water at the soil line rather than overhead, rotate cucurbits on a three to four year cycle, and remove crop debris after harvest.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Clean planting stock

    Start with certified disease-free seed. This one rides on the seed itself, so clean seed is what keeps it out of a bed that does not already have it.The bacterium is seedborne, so certified clean seed closes the most direct route of introduction; the highest-value decision before anything in-season.

  2. Resistant varieties

    Choose a resistant variety alongside the clean seed, especially if angular leaf spot has shown up in your patch before.Resistant cultivars paired with clean seed. Both are seed-order decisions, and neither is recoverable once the crop is in the ground.

  3. Crop rotation

    Move cucumbers to a new spot and keep squash-family crops off that ground for three to four years. The bacteria live on in the old vines and stubble left behind.A three to four year cucurbit rotation outlasts survival in crop residue, which is where the bacterium overwinters.

  4. Water at the base

    Water the soil rather than the leaves, and keep out of the rows while the vines are still wet. Splashing water and wet hands are how the spots travel from leaf to leaf.Splash dispersal and handling wet foliage are the movement mechanisms, and base watering plus keeping out of wet vines addresses both. Warm, wet weather around 75 to 82°F with frequent rain is when the discipline matters most.

  5. Garden sanitation

    Take off the worst-spotted leaves, and clear the old vines out after harvest so the bacteria have less to overwinter in.In-season removal of heavily spotted foliage plus post-harvest residue removal; residue is the overwintering site, so the fall cleanup is what carries into next season.

  6. Copper fungicide

    A labeled copper spray at the first sign can slow the spread, but there is no cure for this one, so treat it as a way to buy time rather than a fix.Fixed copper applied at first symptom slows spread without curing. There is no rescue material for a bacterial leaf spot, so it backs up the cultural steps rather than replacing any of them.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Anthracnose
D · 05
Symptoms Brown or black spots on the leaves that can fall out and leave holes, and dark, sunken, circular spots on the cucumbers themselves that rot in wet weather.Yellowish or water-soaked leaf spots that turn brown to black and may drop out, giving a shot-hole look, plus elongated tan lesions on stems and dark, circular, sunken cankers on the fruit. In wet weather the fruit cankers ooze a pinkish spore mass and rot. Cause A fungus that spreads in warm, rainy weather and splashing water, and survives on old plant debris and infected seed.A fungus (Colletotrichum orbiculare) that needs several days of rainy, warm weather to infect and spreads in splashing water. It survives on old cucurbit residue and on infected seed. Organic treatment Remove infected leaves and fruit, water at the base, and use a labeled fungicide in long wet spells. Do not save seed from sick plants.Remove infected leaves and fruit, avoid overhead watering, and apply a labeled fungicide such as chlorothalonil preventatively in wet spells. Do not save seed from infected plants. Prevention Start with clean seed, rotate cucumbers to a new spot for a few years, clean up old vines after harvest, and water the soil rather than the leaves.Use disease-free seed and resistant varieties, rotate out of cucurbits for three years, remove and destroy old vines and residue after harvest, and water at the soil line to keep foliage dry.
The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

  1. Clean planting stock

    Start with disease-free seed, and do not save seed off a plant that had the disease, since this fungus travels on seed.The fungus survives on infected seed as well as on residue, so clean seed plus a rule against saving from symptomatic plants closes that route.

  2. Resistant varieties

    Pick a resistant variety when you are choosing seed, if one is offered in the type you want to grow.Resistant cultivars alongside clean seed; one seed-order decision covering both, since the sourcing question comes up at the same moment.

  3. Crop rotation

    Keep cucumbers and other squash-family crops out of that bed for three years. The fungus lives on in the old vines left behind.A three-year rotation out of cucurbits outlasts survival on residue, the main carryover alongside seed.

  4. Water at the base

    Water the soil rather than the leaves. The spores move in splashing water, so keeping the foliage dry cuts how far they get.Splashing water disperses the spores, and infection takes several days of warm, rainy weather, so base watering removes the one wetness source you control.

  5. Garden sanitation

    Take off infected leaves and fruit as you find them, and clear away the old vines after harvest.In-season removal of spotted leaves and sunken, cankered fruit plus destruction of residue after harvest; residue is where it carries over to the next crop.

  6. Chlorothalonil Rescue only

    This is the only spray this crop's guidance names for anthracnose, and it is meant preventively: it goes on ahead of a wet spell rather than after spots show. Notice the gap below it. There is no gentler spray listed for this disease on this crop, so the step under this one is the cleanup, and declining to go further is a reasonable place to stop rather than a rung skipped. Read this method's warnings before you take it, because it is a long way up from the step below.The only material this crop's guidance names for anthracnose, specified preventively in wet spells, which is when the infection periods fall. The escalation runs straight from sanitation to a conventional here because the source offers nothing between the two, so the jump is a property of the evidence rather than a gap in the ladder. Declining it leaves the cultural program as the whole of the control, which is what the source describes for a home crop.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Verified · 2 sources View
Seasoned
Where to plant next year

Crop rotation

Try not to grow cucumbers or their relatives in the same spot more than once every 3 years or so. Moving them around the garden each year helps avoid a buildup of pests and disease. Clean up old vines at the end of the season too.Rotate cucurbits on a 3 year cycle, and a 3 to 4 year break where angular leaf spot or anthracnose has been a problem, since both persist on residue. The point is to break the buildup of cucumber beetle, beetle-vectored wilt, and soilborne and seedborne disease. Clear and remove spent vines at season's end rather than tilling them in, which cuts overwintering pest and disease sites and makes rotation more effective.

Family
Cucurbitaceae
Years between
3 years
in the same bed
Avoid following
Do not plant slicing cucumbers where you grew squash, melons, pumpkins, or other cucumbers in the last few years. They get the same pests and diseases, which build up in the soil.Avoid planting slicing cucumbers where another cucurbit grew in the last few years, including squash, melon, pumpkin, and other cucumbers. They share cucumber beetle with the bacterial wilt it spreads, squash bug, powdery and downy mildew, angular leaf spot, and anthracnose, all of which build up in the soil and on debris.
Plant after
Legumes such as beans and peas, sweet corn, leafy greens, or alliums like onions and garlic make good preceding crops, since they do not share the cucurbit pest and disease complex, and a legume leaves nitrogen behind for the moderately hungry cucumber.
Verified · 2 sources View
In the app · pre-launch

When plant taps you on the shoulder

The plant app sends a timely reminder at every critical moment of your slicing cucumber season. The wording adjusts to whichever you pick: beginner or seasoned. Here are three you'll see in Zone 9.

p
plant
Time to watch for beetles Start scouting for cucumber beetles
Your young cucumbers are up. Check for small striped or spotted yellow beetles, which spread a wilt disease cucumbers catch easily, and cover the plants until they flower. Your slicing cucumber seedlings are up, which is when cucumber beetles colonize and can infect highly susceptible plants with bacterial wilt. Scout daily and protect young plants with row cover until flowering.
p
plant
Plant a second cucumber now Sow your backup slicing cucumbers
Now is a good time to plant a second cucumber as a backup. Pests and mildew often wear out the first plants by late summer, so a fresh planting keeps cucumbers coming. Time to sow a succession planting. A fresh sowing now, counted back from your first fall frost, often outproduces the spring crop on cleaner plants once beetles and mildew wear the first planting down.
p
plant
Check for ready cucumbers Check your slicing cucumbers, they size up fast
Your cucumbers are making fruit. Check every day or two and pick them while firm and shiny, they grow fast. Your slicing cucumbers are fruiting. At peak they size up fast, so check every 1 to 2 days and pick young. Frequent picking keeps the plant producing; a fruit left to oversize turns bitter and stops new set.
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Methodology & sources

Every date, temperature, spacing, and recommendation on this page is sourced from university cooperative extension publications, peer-reviewed agricultural research, NOAA climate data, and direct extension calendars. Where claims are softer (traditional gardening wisdom not formally documented), we say so.

Research-backed Documented in cooperative extension publications or peer-reviewed research
Well-grounded A known agronomic principle, but not formally tested for this specific pair
Traditional Time-tested gardening wisdom, limited formal research support
Last reviewed
July 2, 2026
Data version
crops_data_final · v1.0 · schema 2.9
Sources cited on this page
16 publications
Verified entries
Companion-planting claims tagged inline · zone dates verified against 5+ extensions
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  • University of Minnesota Extension umn_ext
  • University of Maryland Extension umd_ext
  • Cornell Cooperative Extension cornell_ext
  • Iowa State University Extension iastate_ext
  • Michigan State University Extension msu_ext
  • NC State Extension ncsu_ext
  • Penn State Extension psu_ext
  • U. of Illinois Urbana-Champaign Extension uiuc_ext
  • UC Davis Postharvest Center ucd_postharvest
  • Texas A&M AgriLife Extension tamu_agrilife
  • Virginia Cooperative Extension 426-331 vce_426_331
  • Piedmont Master Gardeners piedmont_mg
  • UGA Vegetable Garden Calendar uga_calendar
  • Clemson Home & Garden Information Center clemson_hgic
  • UC IPM Statewide IPM Program uc_ipm
  • NOAA 1991-2020 Climate Normals noaa_normals

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Vol. 003 · Slicing Cucumber · plant.lifestyle

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