Roma tomatoes are the sauce tomato: firm, meaty, with few seeds and little juice, bred to cook down into thick sauces, pastes and salsas rather than to be eaten raw off the vine. They are determinate, which means the plant grows to a set size, sets most of its fruit in one big flush, and then stops — a habit that suits gardeners who want a glut of tomatoes to process all at once.
Because romas are determinate, they are grown differently from the tall, sprawling indeterminate tomatoes most gardeners know: less pruning, a stout cage rather than a tall stake, and a harvest that arrives in a rush. They still need the same sun, warmth and steady watering as any tomato, and they mature in 70–80 days. This guide covers starting, supporting, feeding and harvesting romas for the best possible sauce crop.
Roma Tomatoes at a glance
| Growing factor | What this crop needs |
|---|---|
| Sun | full sun |
| Soil pH | 6.0–6.8 |
| Days to germination | 7–14 |
| Days to maturity | 70–80 |
| Spacing | 24–36 inches |
| Water needs | high |
| Cold tolerance | tender |
| Family | Solanaceae |
Starting seeds
Roma Tomatoes seed is best started indoors. Sow in trays or modules filled with fine seed compost, barely covering the seed, and keep the tray warm and moist — germination takes 7–14 days. Give seedlings as much light as you can once they appear. Our seed-starting calculator can work out your sowing date from your last frost, and the germination-time calculator helps you plan around the 7–14-day germination window.
Because this is a tender crop, timing follows the frost: in Zones 3–6 start indoors and plant out only once frosts are past and the soil has warmed; in Zones 7–9 the warm season is long and a second sowing is often possible; in Zones 10–13, which are frost-free, grow it through the cooler months with afternoon shade in the hottest weather. Check your dates with our frost-date calculator or the last-first frost lookup — and when in doubt, ask your local extension service.
Start roma seed indoors, 7–14 days to germinate, in warm conditions — a heated propagator or a warm windowsill makes germination faster and more even. Sow in modules so each seedling has its own rootball, and pot on once before planting out so the plants are sturdy.
Transplanting and planting out
Harden seedlings off for a week before planting out: put them outside for a few hours a day, increasing the time and exposure, and bring them back in at night. Plant out at the final spacing of 24–36 inches apart, in holes the same depth as the pot. Water each plant in well and mulch around (not against) the stems to hold moisture. Our plant-spacing calculator shows how many plants fit your bed at 24–36-inch spacing.
Soil and feeding
Roma Tomatoes grows best in soil with a pH of 6.0–6.8, so test your soil before you plant — a cheap test kit tells you more than guessing ever will. Work in plenty of compost or well-rotted manure to improve structure and feed the soil life, and make sure the bed drains freely. Our soil-volume calculator and raised-bed soil calculator work out how much soil or compost your bed needs.
Feed generously through the season: work compost into the bed before planting and side-dress with a balanced fertiliser once plants are growing strongly. Hungry fruiting and leafy crops repay feeding with visibly bigger harvests, but too much nitrogen gives leaf at the expense of fruit, so follow the label. Our fertiliser calculator works out how much to apply.
Romas are heavy feeders, like all tomatoes: dig in plenty of compost and a handful of balanced fertiliser before planting. A mulch of straw or compost after planting keeps the soil moist and stops soil splashing onto the lower leaves, which is how blight spreads.
Watering
This is a thirsty crop. Water deeply and regularly — shallow daily sprinkles encourage shallow roots and stressed plants. Aim to keep the soil evenly moist, especially while fruit is swelling, and mulch thickly to slow evaporation. Water at the base in the morning so leaves dry by evening, which also keeps disease down. Our watering calculator gives a starting point for your bed size and soil, and the watering schedule generator can build a routine around it.
Sunlight and temperature
Give Roma Tomatoes full sun — at least six hours of direct sun a day, and more is better in most zones. Sun drives flavour and yield in this crop, and plants in shade stay leggy and unproductive. Our sunlight calculator can check whether your spot gets enough sun.
It is tender, so cold is the enemy: a single frost can finish it. Wait until frosts are past and the soil feels warm before planting out, and keep fleece or cloches handy for a late cold snap. In warm zones it will keep producing until the first cold nights of autumn.
Pests and diseases
The pests and diseases to watch for with Roma Tomatoes are aphids, hornworms, flea beetles and whiteflies.
Aphids cluster on tender new growth and under leaves, sucking sap and leaving sticky honeydew.
Hornworms are big green caterpillars that can strip a plant overnight.
Flea beetles chew tiny shot-holes in young leaves.
Whiteflies cloud up from the undersides of leaves when disturbed.
Prevention beats cure: rotate crops so the same family does not grow in the same bed year after year, clear debris at the end of the season, and inspect the undersides of leaves weekly. Our pest identifier helper can help you name a pest from its damage, and the plant-disease checker can narrow down a leaf problem.
Companion plants
Good companions for Roma Tomatoes are marigolds, basil, onions and lettuce.
Marigolds are the classic companion: their roots and scent deter several soil pests, and their flowers bring in pollinators and beneficial insects.
Basil is said to improve the flavour of its neighbours and its scent confuses some pests; it also makes good use of the same sunny, well-watered bed.
Onions help mask the scent of their neighbours from pests, and their upright leaves take little light from the plants beside them.
Lettuce is a shallow-rooted, quick crop that fills the gaps between taller plants without competing hard for nutrients.
Plant companions in the same bed rather than in a separate corner — that is how they do their work. Our companion-planting finder can suggest more pairings for your bed.
Harvesting
Romas are ready about 70–80 days after sowing, and the harvest comes in a flush: because they are determinate, most of the fruit ripens within a few weeks of each other. Pick when the fruit is fully red and slightly soft to the touch — a roma picked too early is hard and flavourless, while one left too long goes soft and splits. Twist or cut the fruit off with a little of the stem attached, and pick every few days so the plant keeps ripening the remaining fruit.
At the end of the season, pull any green fruit before the first frost and ripen them indoors in a paper bag with a banana, or use them green for chutney. Roma plants do not keep producing the way indeterminate tomatoes do, so once the flush is over, pull the plants and compost them — do not leave them to harbour blight over winter. A good roma harvest is a processing day: sauce, passata or roasted tomatoes for the freezer.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Black sunken patch on the fruit end | blossom-end rot from uneven watering | Water evenly and mulch; do not overfeed with nitrogen. |
| Fruit splits after rain | sudden uptake of water | Keep watering even and mulch; pick fruit before heavy rain if possible. |
| Dark spots spread on leaves | blight | Remove affected leaves at once, water at the base, and clear plants at season's end. |
Black sunken patch on the fruit end
Likely cause: blossom-end rot from uneven watering. Blossom-end rot is a dark, leathery patch on the blossom end of the fruit, caused by calcium failing to reach the fruit when watering is uneven. It is not a disease, and it is fixed by steady watering: mulch thickly, water deeply and regularly, and avoid letting plants wilt.
Fruit splits after rain
Likely cause: sudden uptake of water. Splitting happens when a dry plant suddenly takes up a lot of water — the skin cannot stretch fast enough. Keep watering even through dry spells, mulch to hold moisture, and pick nearly ripe fruit before a forecast downpour.
Dark spots spread on leaves
Likely cause: blight. Blight starts as dark spots on lower leaves and spreads fast in wet weather. Remove spotted leaves immediately, never compost them, water only at the base, and mulch to stop soil splashing up.
Frequently asked questions
Are Roma tomatoes determinate or indeterminate?
Roma tomatoes are determinate: the plant grows to a set size, sets most of its fruit in one flush over a few weeks, and then stops. That makes them ideal for sauce-making, when you want a big batch at once, and they need a cage rather than a tall stake and very little pruning.
How long do Roma tomatoes take to grow?
Roma tomatoes take 70–80 days from sowing to maturity. They are started indoors and planted out after the last frost, so the first ripe fruit usually arrives in midsummer, with the main flush following over the next few weeks.
Do Roma tomatoes need pruning?
Very little. Because they are determinate, you should not prune suckers the way you would an indeterminate tomato — those side shoots carry fruit.
Why do my Roma tomatoes have black bottoms?
That is blossom-end rot, caused by uneven watering stopping calcium reaching the fruit. It is not a disease.