Calibrated to Pick your zone and the dates re-calibrate.

The Guide Flowers Vol. 003

Marigold

in Zone 9, this week

Marigolds are easy, cheerful flowers and the classic companion plant, grown for blooms rather than food. They love heat and full sun, handle poor soil and dry spells, and bloom from summer until the first fall frost. There are three main kinds: small bushy French marigolds, tall big-flowered African (or American) marigolds, and tiny lacy Signet marigolds with edible petals. Plant the seeds outside after your last frost once the soil is warm, and you get flowers in about two months. Keep snipping off faded blooms to get more. Their most proven garden trick is fighting soil nematodes: grow a thick patch of French marigolds and dig them in before planting vegetables that nematodes attack. Marigold (Tagetes species) is a warm-season, frost-tender annual in the Asteraceae family, native to Mexico and Central America. It is grown for showy blooms and as the classic companion plant, in three main types: compact French marigolds (Tagetes patula), tall large-pompon African or American marigolds (Tagetes erecta), and petite, lacy, edible-flowered Signet marigolds (Tagetes tenuifolia). Sown into warm soil after frost, it reaches first bloom in roughly 7 to 9 weeks and flowers continuously from summer until the first fall frost. It thrives in heat, full sun, and even poor soil, and is notably drought-tolerant once established. Its best-supported pest function is nematode suppression: French marigolds grown as a dense cover stand and incorporated lower root-knot nematode populations for the following crop.

Fig. 01 · Marigold, mature Zone 9

Mature in

50-70d

from transplant

Sunlight

Full sun

6-8 hrs daily

Water

Moderate

Spacing

8 to 16 in

between plants

Soil pH

6-7

slightly acidic

Today · in your zone

What's happening right now

October 21 · Zone 9 · Stage 01 · Germination

Off-season for marigold 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.

Subzone	Last spring	First fall	Growing days	Winter min	Fruits reliably
9a	Mar 8	Nov 24	~261	20-25°F	Yes · two seasons
9b	Feb 28	Nov 30	~275	25-30°F	Yes · 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, marigold can be planted March through September. Start indoors Jan 31 - Feb 14. In bloom May through November.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

plant

indoors

plant

too late

too cold

bloom

indoors

plant out

bloom

Keep them blooming Deadhead spent blooms through the bloom window to keep new flowers coming.

Seasoned

Stagger your sowings

Succession planting

For flowers all season, plant a new small batch of seeds every 2 to 3 weeks from after the last frost into midsummer. Fresh young plants give the best flowers late in the season. Unlike cool-season crops, marigolds love the heat, so you do not stop for summer.Sow successively every 2 to 3 weeks from after last frost through midsummer to keep fresh, vigorous plants coming; older plantings tire as the season wears on. There is no heat pause: marigolds thrive through peak summer.

Every 2 weeks · sow a short new rowUp to 12 sowings a season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

sow

bloom

keep sowing

continuous bloom

The season, mapped

Seed to garden

The easiest way is to sow marigold seeds straight into warm garden soil (about 65 to 70 °F) after your last frost, a quarter inch deep; they sprout in under a week. For a head start, or for the tall African types, start them indoors 4 to 6 weeks before the last frost (about 8 weeks for African) and move them outside afterward. You can pinch the tops of tall types once to make them bushier.Marigolds direct-sow readily into warm soil (about 65 to 70 °F) at 1/4 in depth and germinate in 5 to 8 days, the simplest method in long-season areas. To gain weeks or for the slow-developing tall African types, start indoors 4 to 6 weeks before last frost (up to 8 weeks for African) and transplant after frost. Pinch tall African types once to encourage branching; French and Signet types need no pinching.

01
Sow indoors →
Jan 31 - Feb 14

Start about 5 weeks before your last frost
02
Transplant out →
Mar 14 - Jun 6

After hardening off
03

First harvest

From May 13

50-70 days from transplant

Start method

Both

Soil temp

70-75°F

Hardening off

7-10 days

If you started plants indoors, harden them off first: set them outside for a little longer each day over about a week so they get used to sun and wind before you plant them out.

From seed to fruit

The growing journey

Stage 01 · Germination

Germination

Days 5-10 · current stage

The first little leaves push up through the soil in under a week.Seed leaves (cotyledons) emerge from warm soil within roughly 5 to 8 days.

Keep the soil warm and damp until the seedlings come up.Keep soil warm (near 70 °F) and evenly moist; do not let it crust or dry out during emergence.

FROM PLANT · Plant seeds outside only once the soil is warm, around 65 to 70 °F. Cold, wet soil makes seeds rot instead of sprout. In warm soil they come up in under a week.Direct-sow once soil is near 65 to 70 °F; warmth, not the calendar date, is the germination trigger, and seed sown into cold, wet soil rots or damps off. In warm soil, marigolds sprout in 5 to 8 days.

FROM PLANT · Plant the seeds about a quarter inch deep. In warm soil they sprout fast, so planting straight in the ground works well.Sow at about 1/4 in depth; marigolds germinate quickly and reliably in warm soil, which makes direct sowing the simplest method in long-season areas.

Seedling

Days 10-24

Real, ferny leaves appear and the little plant starts to settle in.First true, finely divided leaves develop; the plant is small and establishing roots.

Space plants out (small types 8 to 10 inches, tall types about a foot) and water the soil, not the leaves.Thin or space French and Signet to 8 to 10 in, African to 12 to 16 in; water at the base to keep foliage dry and watch for slugs.

FROM PLANT · Once seedlings have a few real leaves, space them out: small types about 8 to 10 inches apart, tall types about a foot. Room for air to move helps prevent mold.Thin or space seedlings by type once they have a few true leaves: French and Signet to 8 to 10 in, tall African to 12 to 16 in. Generous spacing for airflow is a primary cultural defense against gray mold and leaf spot.

FROM PLANT · Keep an eye on young marigolds for slugs and snails, which chew tender seedlings in damp weather. Hand-pick them at night or use a pet-safe iron-phosphate bait.Watch young marigolds for slugs and snails in damp weather; seedlings are a frequent target. Reduce mulch harborage, hand-pick at night, or use iron-phosphate bait, and water at the base.

Established / vegetative

Days 22-40

The plant gets bigger and bushier with more leaves.Plant grows bushier with several leaf sets and begins branching; tall African types gain height.

For tall types, pinch off the top once to make them branch out; small types do this on their own.Pinch tall African types once to force branching; French and Signet branch naturally and need no pinching. Maintain spacing and airflow.

FROM PLANT · If you are growing tall marigolds, pinch off the top once to make them bushier with more flowers. Small types do this by themselves. Go easy on fertilizer so you get flowers, not just leaves.Pinch the growing tip of tall African types once to force branching and more, sturdier stems; French and Signet types branch naturally and need no pinching. Keep nitrogen modest so plants flower rather than run to foliage.

FROM PLANT · As plants grow, keep air moving between them and water the soil, not the leaves. Full sun, space, and dry leaves are what keep mold away, especially in humid areas.Maintain airflow and water at the base as plants fill in; full sun, spacing, and dry foliage keep gray mold and leaf spot in check, sharpest where humidity is high.

Budding

Days 38-58

Flower buds start to form at the tops of the stems.Flower buds form at stem tips; stems lengthen toward bloom.

Keep the soil evenly moist and start checking for tiny mites and mold.Keep moisture even at bud point; begin scouting for spider mites and, in damp weather, gray mold.

FROM PLANT · Keep the soil evenly moist when the first flower buds appear, but not soggy. Too dry means smaller flowers; too wet rots the plant.Keep moisture even as the first buds form; drought stress at bud point reduces flower size and count, but never let the soil stay wet, which rots roots and buds.

FROM PLANT · As buds form, check for tiny spider mites in hot, dry weather and for gray mold on the buds in damp weather. Catching crowding and watering problems early keeps both down.Scout for spider mites in hot, dry spells (marigold's most characteristic pest) and for gray mold on dense buds in damp weather; addressing crowding and dryness early limits both.

Flowering

Days 50-70

Flowers open, about two months after planting, and keep coming until frost.Blooms open and continue; first bloom is roughly 7 to 9 weeks from sowing (French sooner, African later) and continues to first frost.

Snip off faded flowers (or cut some for a vase) to get more blooms.Deadhead spent blooms, or cut for the vase, to sustain bloom; water at the base and keep heads dry.

FROM PLANT · Snip off faded flowers back to the next set of leaves (or cut fresh ones for a vase) to get more blooms until the first fall frost. The small French types keep blooming on their own, but the big types flower more if you deadhead.Deadhead spent blooms back to the next leaf node, or cut for the vase, to redirect energy from seed set into new flowers and sustain bloom to first frost. French types rebloom well even without deadheading; African types benefit most from it.

FROM PLANT · If you want marigolds to fight soil nematodes, the method that works is to grow a thick patch of French marigolds in the problem bed for about two months, then dig them in, before planting vegetables there. Just scattering a few among your crops does not do it.For a documented nematode benefit, treat French marigolds as a cover crop, not a casual interplant: grow a dense, weed-free solid stand for about two months in the target bed, then incorporate it, ahead of the susceptible crop. Interplanting a few among vegetables has not been shown to reduce nematodes.

Seed saving (optional)

Days 72-105

A few flowers left on the plant dry out and form seeds.Selected heads left on the plant dry to brown and set viable seed.

Let a few flowers dry out fully on the plant before collecting their seeds.Leave chosen heads to dry fully before collecting seed; expect hybrids (most bedding series) not to come true.

FROM PLANT · To save seeds, leave a few flowers on the plant and let them dry and turn brown before picking them. Note that seeds from hybrid marigolds will not grow into the same flower next year.To save seed, leave some heads on the plant to dry fully to brown before collecting; most modern bedding marigolds are hybrids, so their seed will not come true to type.

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

Marigolds are not fussy and grow in most ordinary garden soil as long as water drains away and does not pool. Soil that is moderately fertile and well drained is ideal; very rich soil grows lots of leaves and fewer flowers. Avoid soggy ground, which rots the roots. If your soil is very acidic, the leaves can speckle bronze, so a normal garden range works best.

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 · 6-8 hrs/day

Water

moderate

Spacing

8 to 16 inches

Soil

loam, sandy loam

Days to maturity

50-70 days from transplant

Soil pH

6 to 7

Container OK?

Yes · 1+ gal pot

Germination temp

70-75°F

In a pot

Yes, 1 gallon and up

Compact French and Signet marigolds are excellent in pots, window boxes, and on balconies. Use a pot with drainage holes, a well-draining potting mix, and full sun. Tall African types need a larger, deeper pot. Do not let pots stay soggy, since marigolds rot in wet soil.Dwarf and compact French and Signet series are the container performers, thriving in window boxes, edging pots, and balcony containers; full sun and a free-draining mix are essential, since marigolds rot in saturated pots. Tall African types are workable in large, deep containers but want room and may need staking.

Pot size: 1 gallon and up; 2 gallons is comfortable
Mature size: 1 to 4 feet tall, 6 to 12 inches wide
Drainage: Drainage holes are a must.
Watering: Pots dry out faster than the garden, so check them in hot weather. Water when the top inch of soil feels dry, and let the extra drain out the bottom. Do not let the pot stay soggy, and try not to wet the leaves.Containers dry faster than ground beds, so check in heat and water when the top inch is dry, letting excess drain freely; never let the mix stay constantly wet, which rots roots. Water at the base to keep foliage dry.
Depth and shape: At least 6 inches deep.
Self-watering pot: Yes. Self-watering containers work for marigolds only if the surface dries between top-ups; keep the wick reservoir from saturating the root zone, since constant moisture undercuts their drought-adapted roots and rots dwarf types.
Mix: General-purpose well-draining potting mix. A free-draining mix is the priority; blend in perlite or coarse sand if the base mix holds too much water, and a modest amount of compost for fertility. Avoid heavy, water-retentive mixes that keep the root zone saturated, since dwarf French types rot readily.
Feeding: Frequent watering leaches nutrients from containers, so a light feeding every few weeks with a balanced fertilizer through the bloom season suits potted marigolds; keep nitrogen modest to favor flowers over foliage.

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 marigold

Preferred

6 to 7

Tolerated

5.5 to 7.5

Marigolds are not picky about soil pH (how acidic or alkaline the soil is). A normal garden range around 6.0 to 7.0 is ideal, and you usually do not need to change anything. Only very acidic soil, below about 5.5, can cause speckled, bronze-looking leaves.Marigolds perform best across roughly 6.0 to 7.0 and tolerate a little outside that. No pH adjustment is typically warranted, but strongly acidic soil (below about 5.5) can trigger manganese or iron toxicity that bronze-speckles the foliage, so favor a near-neutral bed.

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Steady hand on the hose

Watering

When & how much

Frequency

Keep the soil damp while seeds sprout and plants get going. After that, water deeply but less often. Grown marigolds handle dry spells well, so you do not need to water every day, and soggy soil does more harm than dryness.Keep soil evenly moist through germination and establishment, then water deeply but less often; established marigolds are notably drought-tolerant, and over-frequent shallow watering invites root rot and foliar disease.

Amount

Marigolds like about one inch of water a week, counting rain. Water deeply once or twice a week instead of a little every day, and let the soil dry out a bit between waterings. Once established, they handle dry spells well.Aim for roughly one inch of water per week from rain plus irrigation during active growth, applied deeply and less often rather than in frequent shallow doses; let the soil dry somewhat between waterings. Established and especially African and Signet plantings tolerate less.

Method

Water the ground around the plant, not the leaves. A soaker hose or watering can at the base works best. Tall marigolds especially can flop or rot if you spray water over the top, so keep the flowers dry; if leaves get wet, water in the morning so they dry by midday.Water at the base with drip or a soaker hose and avoid overhead wetting; on the tall African types in particular, overhead watering breaks stems and leaves the dense blooms wet, which invites gray mold. If you must use a sprinkler, water in the morning so foliage dries fast.

Signs of trouble

Too much water

If lower leaves turn yellow, the plant wilts even though the soil is wet, or the base looks soft and mushy, you are likely overwatering or the soil drains poorly. Wet flowers also turn moldy.Yellowing lower leaves, wilting despite wet soil, and soft, rotting stems or crowns signal overwatering or poor drainage; persistently wet, dense blooms also raise gray-mold pressure. Dwarf French types rot readily if kept saturated.

Too little water

Marigolds that are too dry wilt in the afternoon heat, look dull, and make smaller flowers. They are thirstiest right after planting and when the first buds form, but established plants bounce back from short dry spells.Wilting in the heat of the day that recovers by evening, dulling leaf color, and reduced flower size at bud point indicate underwatering, most critically during establishment and at first bloom; established plants are forgiving of short dry spells.

Feeding rhythm

Feeding

Frequency

light

Type

Balanced or low-nitrogen

When to start

At planting, then sparingly

Marigolds do not need much feeding. Mix a little balanced fertilizer or compost into the soil before planting and that is usually plenty. Too much fertilizer, especially the high-nitrogen kind, gives you leaves instead of flowers, so go light.Marigolds are light feeders; a modest balanced dose worked into the soil at planting is usually all they need. Excess nitrogen pushes soft, leafy growth and suppresses bloom, so favor a balanced or slightly lower-nitrogen feed over a high-nitrogen one, and skip routine feeding once established.

N · P · K = 10-10-10

The three numbers on fertilizer (N-P-K) are nitrogen, phosphorus, and potassium. For marigolds, pick a balanced one like 10-10-10 rather than a high first-number (nitrogen) lawn feed, which gives leaves instead of flowers.A balanced ratio such as 10-10-10 worked in at planting suits marigolds better than a high-nitrogen lawn-type feed, which favors foliage over flowers.

Flower care

Deadheading marigold

Flower form

single to fully double, daisy- to carnation- and pompon-form

Deadheading means snipping off flowers once they fade. Do it regularly: cut the old bloom back to the next set of leaves, and the plant makes more flowers instead of going to seed. Cutting fresh flowers for a vase does the same job. The small French and Signet marigolds keep blooming even if you skip it, but the big African types flower a lot more if you deadhead. Pinch the tops of tall types once when young to make them bushier.Deadhead spent blooms back to the next leaf node through the season to redirect energy from seed set into new flowers and sustain bloom to first frost; cutting for the vase serves the same function. French and Signet types rebloom well even with little deadheading, while the tall African doubles benefit most from it. Pinch tall African types once when young to force branching and more, sturdier stems.

Who grows well together

Companion planting

Marigolds are the classic companion plant, grown to help the rest of the garden more than for themselves. The one pest benefit that research actually supports is against root-knot nematodes (tiny soil worms that damage roots): if you grow a thick, solid patch of French marigolds in a problem bed for about two months and then dig them in, before planting a crop that nematodes attack, they can lower the nematode numbers. Just dotting a few marigolds among your vegetables has not been shown to do this. The old idea that their strong smell drives away insects, rabbits, and deer is traditional belief, sometimes helpful but not reliable. What marigolds clearly do is bring in bees and helpful insects, so they are a cheerful, useful edge or border plant almost anywhere. There is no plant you must keep them away from; just give them room and sun. Marigold inverts the usual companion framing: it is the plant you place to benefit others. Its one research-supported pest function is nematode suppression, and only in a specific form: French marigolds (Tagetes patula) grown as a dense, weed-free solid stand for about two months in the target bed and then incorporated, ahead of a susceptible crop, can reduce root-knot and lesion nematode populations via root-released alpha-terthienyl. UF/IFAS is explicit that simply interplanting a few marigolds among vegetables has not been shown to reduce nematodes, and the African types are less effective than French for this. The broader reputation, that marigold scent repels insects, rabbits, and deer, is traditional companion lore: sometimes borne out, not reliably documented. What is solid is that marigold is a strong pollinator and beneficial-insect draw, so it earns its place as an insectary edge or border. There is no biologically antagonistic companion to avoid; site for sun and airflow.

Other

Vegetable beds with a nematode problem (French marigold as a cover crop)

If a bed has root-knot nematodes, grow a thick patch of French marigolds there for about two months, then dig them in, before planting vegetables that nematodes attack. This is the marigold trick that research actually backs.This is marigold's evidence-based pest function. French marigolds planted as a dense, weed-free solid stand for about two months and then incorporated, ahead of the susceptible crop, reduce root-knot and lesion nematode populations through root-released alpha-terthienyl. It is a sequential, whole-bed treatment, not a concurrent interplant: keep the stand free of grass and weeds (so nematodes cannot feed on other roots) and follow with the vegetable crop the next season. African types are less effective than French. Research-backed

Tomatoes and peppers

Marigolds are traditionally planted with tomatoes and peppers, and they do draw in bees and helpful predator insects. The idea that their smell repels pests is folklore, so enjoy the flowers and beneficial bugs and do not count on them as bug spray.A traditional pairing whose real, defensible benefit is beneficial-insect habitat rather than pest repellence. Marigold nectar and pollen draw hoverflies, lacewings, ladybugs, and parasitic wasps whose larvae prey on aphids and other soft-bodied pests of tomatoes and peppers. Note the honest limits: the popular claims that marigold scent repels pests, and that interplanting a few marigolds controls the nematodes that bother tomatoes, are not supported by extension trials. Plant them as an insectary edge for predator support and color, not as a substitute for pest control. Traditional

Cucurbits (squash, melon, cucumber)

Squash, melons, and cucumbers need insects to move pollen to set fruit. Marigolds bloom a long time and bring in the bees that do that job.A well-grounded pollinator pairing. Cucurbits depend on insect pollination, with several bee visits needed per flower for proper fruit set, and marigold is a reliable, long-blooming pollinator magnet across the cucurbit fruiting window. More pollinator traffic plausibly means better set and fewer aborted fruits. Plant marigolds in nearby rows so the pollinators they draw spill onto the crop; this is a visitation benefit, not a pest-control one. Well-grounded

Brassicas and beans

Marigolds add color and bring in helpful bugs alongside cabbage-family crops and beans without crowding them for food. Traditionally they are also planted to deter pests, though that part is folklore.A habitat-level pairing. Marigold adds beneficial-insect and pollinator habitat alongside cabbage-family crops and beans with low nutrient competition, and the flowers support parasitic wasps and predators that help manage aphids and caterpillars. The traditional claim that marigold scent deters cabbage pests and bean beetles is not extension-verified; treat it as a loose, garden-ecosystem pairing, kept to the edges so it does not shade lower crops. Traditional

Provenance tagged inline · see methodology for the labeling system Key

Cutting for the vase

When to cut

Marigolds are mostly for garden color and helping the garden, but you can cut them for a vase when the flowers are fully open and the stem feels firm. Cut in the morning and put them straight into clean water, pulling off the smelly lower leaves first. Snip off faded flowers through the season to keep more coming.Marigold is grown for garden display, companion value, and cutting; cut blooms for the vase when flowers are fully open and the stem is firm just below the head, in the cool of the morning into clean water. Strip the strongly scented lower leaves below the waterline. Deadhead spent blooms throughout the season to sustain flowering to frost.

Bloom yield

What to expect

One marigold gives you lots of flowers over the summer. The small French and Signet types make many small blooms at once, while the tall African types make fewer but big, showy flowers good for cutting. Keep picking faded flowers and they keep coming until frost.A single marigold blooms profusely over a season; French and Signet types carry dozens of small to medium flowers continuously, while the tall African types produce fewer but much larger pompon blooms well suited to cutting. Deadheading or cutting sustains production to frost.

Marigolds flower the same year you plant them, usually about two months after sowing. There is no waiting year. Plant in spring and you will have flowers from summer until the first frost.Marigolds bloom the first season from seed, roughly 7 to 9 weeks after sowing (French sooner, African later), so there is no establishment year; a spring sowing flowers from early summer to first frost.

What changes yield

Type: French and Signet types yield many small flowers for color and edging; tall African types yield fewer, larger blooms for cutting.Deadheading and cutting cadence: regular deadheading or cutting sustains bloom; neglected African plants set seed and slow, though French types rebloom well on their own.Pinching: pinching tall African types produces more, sturdier flowering stems.Spacing and airflow: adequate spacing sustains healthy foliage and longer productive life by limiting gray mold and leaf spot.Season length: a longer frost-free season and successive sowings extend total bloom into fall.

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Pick your variety

Recommended varieties

Pick the type for your spot. French marigolds are small, bushy, and bloom for a long time, perfect for beds, pots, and edging, and they are the type that suppresses soil nematodes when planted thickly. African marigolds are the tall ones with big round pompon flowers, good at the back of a bed and for cutting. Signet marigolds are tiny, lacy plants covered in small flowers, very tough in heat and drought, with petals you can eat. Open, single flowers are best for bees and butterflies.Choose by type and purpose. French marigolds (Tagetes patula) are the compact, bushy, long-blooming bedding and edging workhorses and the type to use for root-knot nematode cover plantings (cultivars such as 'Single Gold' and 'Tangerine' are the trialed performers). African or American marigolds (Tagetes erecta) are the tall, large-pompon types for the back of the border and for cutting; they benefit most from deadheading and staking. Signet marigolds (Tagetes tenuifolia) are the petite, lacy, heat- and drought-tough edgers, smothered in small single flowers whose petals are edible. Single, open-faced flowers serve pollinators better than the densest doubles.

Bonanza / Durango

French, Tagetes patula; compact double bedding types, early and uniform

Janie series

French, dwarf, very early, container and edging

Single Gold / 'Nema-Gold'

French, single-flowered; the cultivar trialed for root-knot nematode suppression

Queen Sophia / Sophia series

French, large crested double blooms, bicolor

Crackerjack / Inca II

African, Tagetes erecta; tall, large pompon cut-flower blooms

Antigua series

African, compact large-flowered, uniform bedding

Lemon Gem / Tangerine Gem

Signet, Tagetes tenuifolia; lacy foliage, masses of small edible single flowers

In the vase

Vase life

Marigolds are flowers for the garden and the vase, not food to store, so there is nothing to refrigerate or freeze. To make cut flowers last, trim the stems, pull off the smelly lower leaves that would sit underwater, and use a clean vase with fresh water. They usually stay nice for several days to a week. The small Signet marigolds have edible petals with a spicy, tarragon-like flavor, used fresh.Marigold is grown for bloom and companion value, not as a stored edible, so the refrigerate and freeze fields do not apply. For cut flowers, recut stems and strip the strongly scented lower leaves below the waterline (they foul vase water fast), use clean water with floral preservative, and keep blooms out of direct sun. Vase life is several days to about a week. The Signet types have edible, spicy-tarragon petals used fresh as a garnish.

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When something goes wrong

Common problems

Flowers turned mushy with gray fuzzFlowers and buds rotting with gray fuzz (gray mold)

01 of 06

What happened A mold called gray mold (Botrytis) rotted the flowers, usually because the air was humid, plants were crowded, or the blooms stayed wet.Botrytis gray mold took hold, favored by humidity, crowding, and overhead wetness; the dense double African blooms rot from the center. Next season Give plants more room next time, water the soil instead of the flowers, plant in full sun, and pick off faded blooms before they rot.Space plants for airflow, water at the base, site in full sun, and remove spent or rotted heads promptly; favor single-flowered or French types in humid sites.

Plants grew tall and leafy with few flowersTall, leafy plants with few blooms

02 of 06

What happened The plants got too much high-nitrogen feed or too much shade, so they grew leafy instead of flowery.Too much nitrogen or too much shade drove leafy growth at the expense of bloom; unpinched tall types also grow tall and sparse. Next season Next time, go easy on fertilizer, plant in full sun, and pinch the tops of tall types to make them bushy.Keep nitrogen modest, grow in full sun, and pinch tall African types once to force branching.

Young plants fell over, or the base rottedSeedlings collapsed or plants rotted at the base

03 of 06

What happened A rot at the base, from cold or soggy soil, killed the plants. Overwatering is the usual cause.Damping-off and root or stem rot struck plants in cold, wet soil or kept too wet; dwarf French types are especially prone in saturated soil. Next season Wait until the soil is warm before planting, make sure it drains well, and do not keep it soggy.Wait for warm soil (about 65 to 70 °F) before sowing, ensure good drainage, and water less, letting the soil dry between waterings.

Frost killed or damaged the plantsPlants blackened by frost

04 of 06

What happened Marigolds cannot handle frost. A late spring frost or the first fall frost will damage or kill them.Marigold is frost-tender; frost at either end of the season, planting out too early in spring or the first frost in fall, kills or damages plants. Next season Plant only after your last frost in spring, and know that the first frost in fall ends the marigold season.Direct-sow or transplant only after all frost danger has passed, and expect plants to end with the first fall frost.

Leaves looked speckled and dusty with fine websSpeckled, dusty-looking leaves with fine webbing (spider mites)

05 of 06

What happened Tiny spider mites, which love hot and dry weather, speckled the leaves and spun fine webs. Marigolds get them easily in midsummer.Spider mites built up in hot, dry, dusty conditions, marigold's most characteristic pest, stippling leaves and webbing the foliage in midsummer. Next season Keep plants watered and spray the leaves with water to knock mites off. For bad cases, use insecticidal soap.Keep plants watered, raise humidity around foliage with base watering, and dislodge mites with water sprays; use insecticidal soap or a miticide for heavy infestations.

Few or no seeds sproutedSeeds failed to come up

06 of 06

What happened Cold soil is usually why marigold seeds do not sprout well. Planted too early in cool soil, they come up poorly or rot.Cold soil is the usual cause; seed sown before soil reaches about 65 to 70 °F germinates slowly, erratically, or rots. Next season Wait for warm soil, plant a quarter inch deep, and keep it damp until they sprout.Wait for warm soil (about 65 to 70 °F), sow at 1/4 in, and keep evenly moist during emergence.

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The usual suspects

Pests & diseases

Pests

Spider mites

P · 01

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.

Even watering

Keep marigolds steadily watered through hot, dry spells. Mites (very tiny sap-feeding pests, smaller than insects) build up fastest on plants that have been left thirsty and stressed, and marigolds in midsummer are exactly the plants they go for.Consistent soil moisture is the base of the program: this pest is worst on stressed and container plants in hot, dry, dusty stretches, so plants that are not drought-stressed give it much less to work with.
Water spray

Spray the plants with a jet of water, hitting the undersides of the leaves where the fine speckling and webbing show up. This knocks the mites off and helps counter the hot, dusty conditions they thrive in.Regular forceful water sprays dislodge mites and break up the dry, dusty leaf environment that favors them; direct the spray at the stippled undersides. Often enough on its own for light midsummer pressure.
Insecticidal soap

If the speckling and webbing keep spreading despite watering and spraying, treat with insecticidal soap, a mild soap-based spray that works on contact. Coat the leaf undersides thoroughly, since it only kills what it touches.For a heavy infestation the water rungs have not held, insecticidal soap with thorough underside coverage is the escalation this crop's guidance points to. Avoid spraying drought-stressed plants and repeat as needed for coverage.

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

Aphids

P · 02

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.

Water spray

A strong spray of water knocks the clusters off new growth and buds, and that is usually all these soft little insects need. Repeat if they regroup.Hose colonies off tender growth and buds as a first knock-back; on marigold this is typically sufficient, since populations rarely build far here.
Beneficial predators

Mostly, just let the good bugs work. Marigold flowers draw ladybugs and hoverflies, which are beneficials (helpful insects that eat pests), and they tend to clean up aphid clusters on their own if you hold off on sprays.The flowers recruit their own natural enemies: ladybugs and hoverflies drawn to the blooms usually hold aphids in check without intervention. Avoid broad sprays that would take out the predators doing this work.
Insecticidal soap

If clusters keep building anyway, insecticidal soap, a mild soap-based contact spray, usually handles them. Spray only the shoots where aphids actually are, so you spare the ladybugs and hoverflies.Reserve insecticidal soap for populations that build despite the resident predators; treat infested shoots directly rather than blanketing the planting, since the beneficials this crop attracts are the main long-term control.

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

Slugs and snails

P · 03

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.

Garden sanitation

Clear away the damp hiding places, such as loose mulch, boards, and plant debris near the bed, where slugs and snails wait out the day. Fewer shelters means fewer of them reaching your seedlings at night.Reduce harborage around the planting: thin out mulch and clear debris that shelters them by day. Marigold seedlings are a frequent target in damp conditions, so tighten this up before wet spells.
Handpicking

Go out at night with a flashlight and pick off the slugs and snails you find. They feed after dark, which is why the ragged holes appear on plants that looked fine in the afternoon.Regular night handpicking during damp weather keeps numbers down on young plants and lower foliage, where the ragged feeding concentrates. Most worthwhile while seedlings are small and vulnerable.
Iron phosphate slug bait

If picking and cleanup are not keeping up, scatter iron phosphate slug bait, a lower-risk pellet bait, on the soil around the plants rather than on the plants themselves, and follow the label.Iron phosphate bait backs up sanitation and handpicking when pressure stays high in damp conditions; apply to the soil surface around vulnerable seedlings per the label.

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

Japanese beetles

P · 04

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.

Handpicking

In the morning, while the beetles are still sluggish, knock or pick these shiny copper-and-green beetles off the flowers and leaves into a container of soapy water. Early-to-midsummer is when they show up, so make it part of your morning walk then.Dawn handpicking into soapy water is the whole program here: beetles are torpid early and drop readily. Skip pheromone traps, which draw in and concentrate more beetles than they catch. Feeding runs early-to-midsummer, on blooms and as skeletonized foliage.

No spray for this one. Prevention is the control.

Diseases

Botrytis blight (gray mold)

D · 01

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.

Airflow and spacing

Give plants generous room in full sun so air moves through and the blooms dry out. This mold takes hold in cool, damp, crowded plantings, and the big double African marigolds are the most at risk because their dense flowers trap moisture.Site and spacing are the primary controls: full sun and wide spacing keep the canopy and blooms drying fast, denying Botrytis the sustained wetness it needs. The dense double African types, which tend to rot from the center of the bloom, benefit most from the extra room.
Water at the base

Water at the soil, not over the flowers. Wetting those dense blooms from above gives the gray fuzz exactly the damp conditions it needs to rot buds and petals.Base watering keeps overhead wetness off the flower heads, which is where this disease does its damage in humid, crowded conditions. Pair it with the spacing rung; the two together remove most of the moisture the mold depends on.
Garden sanitation

Pick off spent and rotting flowers promptly, since a moldy bloom left on the plant spreads the problem. Throw infected material in the trash rather than the compost.Prompt removal of spent and rotted heads takes the sporulating tissue out of the planting before it seeds new infections. Do not compost infected debris; destroy or discard it.

No spray for this one. Prevention is the control.

Leaf spots and powdery mildew

D · 02

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.

Airflow and spacing

Space plants out so air can move between them. Both the dark leaf spots and the white powdery film show up most in damp, humid weather on crowded plantings, so room to dry is the first defense.Crowding and humidity drive both the foliar spotting and the occasional powdery mildew here; generous spacing for airflow shortens leaf wetness and lowers the canopy humidity both depend on.
Water at the base

Keep the leaves dry by watering at the soil instead of overhead. If you have no choice but to sprinkle from above, do it in the morning so foliage dries during the day.The spots spread by overhead wetness and splash, so base watering removes the main dispersal route. Where overhead irrigation is unavoidable, run it in the morning so leaves dry quickly.
Garden sanitation

Pick off badly spotted leaves as you see them, and clean up infected fallen leaves so the problem does not keep reseeding itself.Remove heavily affected leaves during the season and clear infected debris; sanitation plus the two watering and spacing rungs is the whole program this crop's guidance lays out.

No spray for this one. Prevention is the control.

Root, stem, and crown rot (damping-off)

D · 03

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.

Improve drainage

Plant marigolds in soil that drains well. Wet, poorly drained ground rots the roots and stem bases, and no amount of care later makes up for a waterlogged spot.Well-drained soil is the foundation: these soilborne rots are driven by poor drainage and standing wetness at the roots and crowns. On heavy or low ground, fix the drainage before planting rather than fighting rot afterward.
Sound sowing practice

Wait for the soil to warm before sowing, and water with a light hand. Damping-off (young seedlings suddenly collapsing at the soil line) hits seed sown into cold, wet ground, and overwatering rots older plants too, especially the small French types.Warm-soil sowing plus restrained watering is the prevention program; this crop's guidance frames these rots as something you prevent rather than treat. Cold, wet seedbeds drive damping-off, and dwarf French types are prone to rotting whenever they are kept too wet.

No spray for this one. Prevention is the control.

Aster yellows

D · 04

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.

Garden sanitation

There is no cure for this one. When a plant shows yellowed, distorted growth or flowers turning green and deformed, pull it up and throw it away, not in the compost, so the disease is not passed along by the leafhoppers that spread it.Rogue out symptomatic plants promptly and discard them; a phytoplasma infection is incurable, so removal is the control. Prompt pulling limits the reservoir leafhoppers can acquire it from as they move through the aster family.

No spray for this one. Prevention is the control.

Seasoned

Where to plant next year

Crop rotation

Rotating marigolds is not as important as it is for vegetables, but it still helps. Plant them in a different spot each year if you can, and clean up old, diseased leaves at the end of the season. Used on purpose, a thick patch of French marigolds grown for a couple of months and then dug in is a real way to cut down soil nematodes before you plant vegetables there.Rotation matters less for a fast-growing ornamental annual than for heavy-feeding vegetables, but moving marigolds to a fresh bed each year and clearing infected debris at season end limits carryover of gray-mold and leaf-spot inoculum. Used deliberately, a two-month French marigold cover stand turned under is a documented preceding-crop treatment for root-knot nematodes.

Family

Asteraceae

Years between

1 years

in the same bed

Avoid following

Marigolds are in the daisy family (Asteraceae). If they had a lot of disease, do not plant them, or other daisy-family flowers, in the same spot the very next season. On the flip side, a thick planting of French marigolds is actually a good thing to grow before nematode-prone vegetables, because it lowers the nematodes in that soil.As an aster-family (Asteraceae) annual, avoid following marigold immediately with other susceptible asters where soilborne or foliar disease has built up; rotate the bed to an unrelated family for a season if gray mold or leaf spot was heavy. Note the inverse: a French marigold stand is itself a beneficial rotation tool, lowering root-knot nematode pressure for the crop that follows.

Plant after

legumesleafy greens

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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 marigold season. The wording adjusts to whichever you pick: beginner or seasoned. Here are three you'll see in Zone 9.

plant

Last frost arrives

Time to plant marigolds Time to sow marigolds

Your last frost has passed, so you can plant marigold seeds or transplants outside once the soil feels warm, about a quarter inch deep for seeds. Soil should be warm enough now. Direct-sow at about 65 to 70 °F, a quarter inch deep, after frost danger has passed, or set out transplants.

plant

Established arrives

Pinch tall marigolds (optional) Pinch tall marigolds

If you are growing the tall type of marigold, pinch off the top once now so it grows bushier. The small types do not need this. Tall African types branch and bloom better if pinched once now; French and Signet types need no pinching.

plant

Flowering arrives

Time to deadhead and cut Start deadheading and cutting

Your first flowers are opening. Snip off faded ones (or cut some for a vase) to keep more blooms coming all season. First blooms are opening. Deadhead spent flowers, or cut for the vase, regularly to sustain bloom through to first frost.

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Seasoned

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How we built this guide

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

June 29, 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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