Paste tomato with meaty flesh and low moisture -- ideal for sauces, canning, and drying. Reliable producer with fewer disease issues than slicers.
Plant window opens
Jan 22
Last chance to plant
Feb 12
Last frost
~Jan 15
Days to harvest
73–80 days
Difficulty
Easy
Ready to harvest — Zone 10
Harvest: Apr - May
Harvest urgency: weekly— Harvest window lasts several weeks
Planting Calendar
In Zone 10, Roma Tomato can be planted outdoors from Jan 22 — the window closes around Feb 12. Start seeds indoors around Dec 11 - Dec 18.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
plant
plant
plant
plant
plant
too late
too late
too late
harvest
harvest
harvest
plant window
harvest
too late
Cool season is primary window. Fall planting in September gives second crop through winter.
Your zone at a finer grainNOAA 1991–2020
Zone 10 is split into two subzones. The a/b distinction affects your exact last frost date by 1–2 weeks -- meaningful for heat-sensitive crops and fruit tree hardiness.
Subzone
Last frost
First fall
Season
Min temp
10a
none
none
~365 days
30 to 35°F
10b
none
none
~365 days
35 to 40°F
plant detects your subzone from your location and adjusts planting windows accordingly.
Growing Journey
Here is what to expect at each stage — and what to do when you get there.
GerminationDay 5-10
Keep soil temperature between 70-80°F. A heat mat makes a real difference. Cover with a humidity dome until sprouts appe
SeedlingDay 7-28
Remove the humidity dome the moment sprouts appear. Get them as close to your brightest light source as possible -- legg
EstablishedDay 28-56
Begin hardening off 7-10 days before your transplant date. A few hours outside each day, sheltered from wind. Plant deep
FloweringDay 45-75
Switch from a balanced feed to a high-potassium fertiliser. Gently tap the flowering stems in the morning to help pollin
HarvestDay 55-80
Pick regularly -- every tomato you harvest signals the plant to produce more. Leaving ripe fruit on the vine slows produ
End of SeasonDay 120-180
Pinch out the growing tips to direct energy into existing fruit. Bring any nearly-ripe tomatoes inside if frost threaten
What to Expect
Typical yield
8-12 lbs over the season -- compact and prolific
At peak: Roma plants tend to set a lot of fruit at once -- perfect for batch cooking and preserving
First seasons are for learning. If you get enough for a salad, that is a success. You will get more each year as you learn what your specific garden needs.
Key factorshours of direct sunlightconsistent wateringfeeding schedulestaking and airflow
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Grown Roma Tomato before?or
Care Guide
Sunlight
Full sun · 6–8 hrs/day
Watering
Moderate
Spacing
24–36 inches
Soil
Well-draining, fertile loam
Days to maturity
73–80 days
Soil pH
6.0–6.8
Plant tip · Zone 10
Cool season is primary window. Fall planting in September gives second crop through winter.
Growth habit
Determinate
Most Roma varieties are determinate -- they grow to a set height (3-4 feet), produce a concentrated crop over 2-3 weeks, then stop. Less pruning needed. Good for sauce making -- all fruit ripens at once.
How to know it's ready
Pick when deep red all over, firm but yielding to gentle squeeze. Roma skins are thicker so feel firmer than slicing tomatoes at peak ripeness.
Watering Roma Tomato
How often
Every 2-3 days in heat
How much
1-2 inches per week
Method
At soil level
Overwatering signs
Yellow leaves, cracked fruit
Underwatering signs
Wilting, blossom drop
Feeding Schedule
How often
every 2 weeks
Feed type
Tomato fertilizer
Key timing
start when first flowers appear
NPK: high K, e.g. 5-10-10
Feed regularly but avoid excess nitrogen -- Roma tomatoes need potassium for firm, meaty fruit.
Example product: Miracle-Gro Tomato Plant Food
Reminder: every 14 days after feeding
Indoors — 6 weeks before last frostHarden off required
Start indoors 6-8 weeks before last frost. Harden off over 7-10 days.
Container friendly · Minimum 10 gallons
Good container tomato. 10-gallon pot minimum. Determinate types need less support.
Companion Planting
Some plants help Roma Tomato thrive. Others compete or cause problems.
Grows well with
BasilMarigoldsCarrotsGarlic
Keep apart from
FennelBrassicas
Common Problems
Something went wrong? Here is what likely happened and what to do differently next time.
Frost or cold damage
What happened: Tomatoes are tropical plants and suffer the moment temperatures drop near freezing. Even a brief cold night can blacken leaves and kill young plants. If it happened at transplant, the plant was likely moved out too early -- soil temperature matters as much as air temperature.
Next season: Wait until both night temperatures are reliably above 50°F and soil temperature is above 60°F before transplanting. A cheap soil thermometer removes the guesswork.
Pests or disease
What happened: Tomatoes are susceptible to blight, blossom end rot, and several common pests. Blight spreads fast in wet, humid conditions and usually starts at the lower leaves. Blossom end rot is caused by calcium deficiency triggered by irregular watering -- not a nutrient problem.
Next season: Water consistently at the base -- not overhead. Remove any affected leaves immediately. Rotate tomatoes to a different bed each year and stake plants to improve airflow.
Too much water
What happened: Overwatered tomatoes show yellowing lower leaves, cracked fruit, and roots that cannot get oxygen. Inconsistent watering -- dry then suddenly wet -- causes fruit splitting and blossom end rot.
Next season: Water deeply twice a week rather than a little every day. Mulching around the base dramatically improves moisture consistency.
Too little water
What happened: Drought stress during flowering causes blossom drop -- no flowers, no fruit. During fruiting, inconsistent moisture causes blossom end rot and cracked skin.
Next season: Tomatoes need 1-2 inches of water per week. Mulch heavily to retain moisture, and water at the base never the leaves.
Not enough sun
What happened: Tomatoes need a minimum of 6-8 hours of direct sun to produce well. In shade they grow leafy but set little or no fruit, and are much more prone to disease.
Next season: Tomatoes are one of the most sun-hungry vegetables. If your current spot is marginal, prioritise this bed for tomatoes next season and move something more shade-tolerant elsewhere.
What went wrong
Something didn't work out? Here is what likely happened and what to do differently next season.
Frost or cold damage
What happened: Tomatoes are tropical plants and suffer the moment temperatures drop near freezing. Even a brief cold night can blacken leaves and kill young plants. If it happened at transplant, the plant was likely moved out too early -- soil temperature matters as much as air temperature.
Next season: Wait until both night temperatures are reliably above 50°F and soil temperature is above 60°F before transplanting. A cheap soil thermometer removes the guesswork.
Pests or disease
What happened: Tomatoes are susceptible to blight, blossom end rot, and several common pests. Blight spreads fast in wet, humid conditions and usually starts at the lower leaves. Blossom end rot is caused by calcium deficiency triggered by irregular watering -- not a nutrient problem.
Next season: Water consistently at the base -- not overhead. Remove any affected leaves immediately. Rotate tomatoes to a different bed each year and stake plants to improve airflow.
Too much water
What happened: Overwatered tomatoes show yellowing lower leaves, cracked fruit, and roots that cannot get oxygen. Inconsistent watering -- dry then suddenly wet -- causes fruit splitting and blossom end rot.
Next season: Water deeply twice a week rather than a little every day. Mulching around the base dramatically improves moisture consistency.
Too little water
What happened: Drought stress during flowering causes blossom drop -- no flowers, no fruit. During fruiting, inconsistent moisture causes blossom end rot and cracked skin.
Next season: Tomatoes need 1-2 inches of water per week. Mulch heavily to retain moisture, and water at the base never the leaves.
Not enough sun
What happened: Tomatoes need a minimum of 6-8 hours of direct sun to produce well. In shade they grow leafy but set little or no fruit, and are much more prone to disease.
Next season: Tomatoes are one of the most sun-hungry vegetables. If your current spot is marginal, prioritise this bed for tomatoes next season and move something more shade-tolerant elsewhere.
Pests & Diseases
Know what to look for before it gets out of hand — early identification is the most important step.
Aphids
pestmedium
What to look for
Clusters of tiny soft insects on new growth and leaf undersides. Leaves curl, yellow, or become sticky with honeydew. Sooty black mold may follow.
Cause
Multiple aphid species. Populations explode rapidly in warm weather.
Organic treatment
Blast off with strong water jet. Apply insecticidal soap or neem oil directly to colonies. Introduce ladybugs or lacewings.
Prevention
Plant marigolds and nasturtiums nearby. Avoid excess nitrogen fertilizer which creates soft, aphid-attractive growth. Encourage beneficial insects.
Tomato hornworm
pesthigh
What to look for
Large green caterpillars (up to 4 inches) stripping foliage. Leaves disappear rapidly. Black droppings on leaves.
Cause
Manduca quinquemaculata moth larvae. Mid to late summer pest.
Organic treatment
Hand-pick -- they are well camouflaged but easy to remove. Apply Bt (Bacillus thuringiensis) spray. If white cocoons visible on back, leave them -- parasitic wasps are doing the work.
Prevention
Till soil in autumn to kill overwintering pupae. Plant dill and basil nearby to attract predatory wasps.
Flea beetles
pestlow
What to look for
Tiny round shot-holes in leaves, especially on seedlings and young plants. Small shiny black beetles jump when disturbed.
Cause
Multiple flea beetle species. Most active in spring on young plants.
Organic treatment
Use row covers on seedlings. Apply diatomaceous earth. Neem oil spray.
Prevention
Delay transplanting until plants are large. Use transplants rather than seeds.
Spider mites
pestmedium
What to look for
Fine stippling or yellow dots on leaves. Fine webbing on leaf undersides. Leaves may bronze, dry out, and drop. Worst in hot dry weather.
Cause
Tetranychus urticae and related species. Thrives in heat and drought.
Organic treatment
Blast with water repeatedly. Apply neem oil or insecticidal soap to leaf undersides. Increase humidity around plants.
Prevention
Keep plants well-watered in hot weather. Avoid dusty conditions. Introduce predatory mites.
Early blight
diseasemedium
What to look for
Dark brown spots with concentric rings on lower leaves first. Affected leaves yellow and drop. Spreads upward through plant.
Cause
Alternaria fungus. Favoured by warm wet conditions.
Rotate tomatoes every 3-4 years. Water at soil level. Space plants for airflow. Stake to keep foliage off ground.
Blossom end rot
disordermedium
What to look for
Dark, sunken, leathery patch at the bottom (blossom end) of fruit. Affects first fruits most. Not contagious.
Cause
Calcium deficiency in developing fruit, caused by irregular watering or root damage -- not a pest or disease.
Organic treatment
Mulch to maintain even soil moisture. Water consistently. Foliar calcium spray provides some relief. Remove affected fruit.
Prevention
Consistent watering is the key prevention. Avoid root disturbance. Do not over-fertilize with nitrogen.
Septoria leaf spot
diseasemedium
What to look for
Small circular spots with dark borders and pale grey centres, starting on lower leaves. Spots may have yellow halos.
Cause
Septoria lycopersici fungus. One of the most common tomato diseases.
Organic treatment
Remove affected leaves. Apply copper fungicide. Ensure good air circulation.
Prevention
Rotate crops. Water at soil level. Mulch around plants.
Late blight
diseasehigh
What to look for
Water-soaked, rapidly expanding brown patches on leaves and stems. White fuzzy growth on undersides in humid conditions. Can destroy plants in days.
Cause
Phytophthora infestans oomycete. The same pathogen that caused the Irish potato famine. Spreads rapidly in cool wet weather.
Organic treatment
Remove and destroy all affected material immediately -- do not compost. Apply copper fungicide preventively in wet conditions.
Prevention
Plant resistant varieties. Ensure excellent airflow. Never leave tomato debris in the garden over winter.
Recommended Varieties
San Marzano (classic)
Amish Paste (heirloom)
Juliet (crack-resistant)
Heinz 1350
Juliet is technically a plum type but more crack-resistant and easier to grow than San Marzano.
Crop Rotation — rotate every 3 years
Nightshade family (Solanaceae)
Avoid planting after: Tomatoes, peppers, eggplant, potatoes -- all share blight and fusarium diseases
Good to follow: Brassicas, legumes, corn, root vegetables
Always rotate nightshades to a fresh bed -- blight and fusarium can persist in soil for years.
Storing Your Harvest
Room temp
1 week at room temperature -- never refrigerate
Fridge
Only if overripe: 1-2 days
Freezer
Core, freeze whole for sauces -- or slice and freeze flat
Roma is the paste tomato -- freeze in large batches for winter sauce.
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Weather watch
plant monitors these conditions and sends an alert the moment they are forecast for your location.
Frost Warning
Frost warning -- protect your tomatoes tonight
Temperatures are dropping close to freezing tonight. Cover plants with fleece or old bedsheets, or bring containers inside. Tomatoes are frost-tender and one cold night can end your season early.
HIGH priority
Heat Stress
Heat stress warning for your tomatoes
Several very hot days ahead. Tomato flowers can drop when temperatures stay above 95°F. Water deeply in the early morning, add mulch around the base to retain moisture, and consider shade cloth during the hottest part of the day.
MEDIUM priority
Drought
Your tomatoes need deep watering
It has been dry. Inconsistent watering at this stage causes blossom end rot and cracked fruit. Water deeply at the base -- aim for 1-2 inches this week. Mulching around the stem helps hold moisture.
MEDIUM priority
High Humidity
High humidity -- watch for blight
Humid conditions are ideal for early and late blight. Check lower leaves for dark spots with yellow halos. Remove any affected leaves immediately and do not compost them. Good airflow around the plant is your best defence.
MEDIUM priority
Heavy Rain
Heavy rain -- harvest ripe tomatoes now
A lot of rain in a short time can split ripe fruit. Pick anything that is nearly ready before it cracks, and check for soil splash on lower leaves which can spread disease.
LOW priority
Moon phase planting
Traditional growers have used lunar cycles to time planting and harvest for centuries. The moon affects moisture levels in soil and sap flow in plants.
Above-ground crop
Waxing moon -- new moon to full moon
Plant and harvest on a waxing moon. Energy draws upward into leaves, stems, and fruit. Germination is strongest in the days after the new moon.
Lunar phase guide
New moon → Full moon
Waxing phase
Best for planting above-ground crops. Sap rises, germination is stronger. Good for transplanting.
Full moon → New moon
Waning phase
Best for harvesting, pruning, and root crops. Energy draws downward. Good for dividing perennials.
Full moon
Peak moisture
Avoid planting -- seeds may rot in high-moisture conditions. Good for harvesting crops to eat fresh.
New moon
Rest period
Avoid planting or transplanting. Best for soil preparation, weeding, and composting.
Common questions
In Zone 10, start roma tomato seeds indoors around Dec 11 - Dec 18, then transplant outdoors Jan 22 - Feb 12 after your last frost around Jan 15. Cool season is primary window. Fall planting in September gives second crop through winter.
Zone 10 has an average last spring frost around Jan 15 and a first fall frost around Dec 31. These vary by location — the plant app uses your ZIP code with NOAA data for precision.
Good companions for roma tomato include Basil, Marigolds, Carrots, Garlic. Avoid planting near Fennel, Brassicas.
Roma Tomato typically takes 73–80 days to harvest in Zone 10. Expected harvest window: Apr - May.
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