Determinate Roma
Solanum lycopersicum 'Determinate Roma'
The gold standard for paste tomatoes, Roma produces abundant crops of meaty, egg-shaped fruits perfect for sauces, canning, and preserving. This determinate variety ripens most of its fruit within a concentrated period, making it ideal for gardeners who want to process large quantities at once. With excellent disease resistance and reliable production, it's a workhorse variety every serious gardener should grow.
Harvest
75-80d
Days to harvest
Sun
Full sun
Zones
10–11
USDA hardiness
Height
1-10 feet
Planting Timeline
Showing dates for Determinate Roma in USDA Zone 7
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Determinate Roma · Zones 10–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 1 | May – May | July – August | — | October – August |
| Zone 2 | April – May | June – July | — | September – September |
| Zone 11 | January – January | January – February | — | April – June |
| Zone 12 | January – January | January – February | — | April – June |
| Zone 13 | January – January | January – February | — | April – June |
| Zone 3 | April – April | June – July | — | September – October |
| Zone 4 | March – April | June – June | — | August – October |
| Zone 5 | March – March | May – June | — | August – October |
| Zone 6 | March – March | May – June | — | August – October |
| Zone 7 | February – March | April – May | — | July – September |
| Zone 8 | February – February | April – May | — | July – September |
| Zone 9 | January – January | March – April | — | June – August |
| Zone 10 | January – January | February – March | — | May – July |
Succession Planting
Roma tomatoes are determinate, meaning each plant flowers and sets fruit in a compressed 2–3 week window, then winds down — you don't replant every few weeks the way you would with lettuce. One transplant date per bed is the right call. If you want to spread out that concentrated harvest — useful if you're canning sauce and don't want 40 pounds of fruit dropping on the same day — stagger transplant dates by 10–14 days across two or three separate beds rather than replanting the same spot.
What matters more for Romas is what comes after them. NC State Extension's organic gardening guidance recommends a 3–4 year rotation by crop type (fruit → root → stem → leaf), and the IPM section notes that some tomato diseases — including southern bacterial wilt and early blight (Alternaria solani) — can persist in the soil long enough to warrant a 5–7 year gap before putting nightshades back in the same bed. A workable sequence: Romas one year, then beets, then chard or celery, then spinach.
Complete Growing Guide
The concentrated ripening window of Determinate Roma demands strategic timing—plant in succession every two weeks if you want staggered harvests rather than one massive glut. This variety thrives in full sun with consistently moist soil and benefits from calcium supplementation to prevent blossom-end rot, a common issue in paste tomatoes. Unlike indeterminate varieties, Determinate Roma stops growing at a predetermined height and produces most fruit simultaneously, so minimal pruning is necessary; excessive leaf removal can expose fruit to sunscald. Watch for early blight and fusarium wilt, which this variety resists moderately but doesn't eliminate entirely—improve air circulation and avoid overhead watering. A practical tip: since all fruit matures within 75-80 days, plan your preservation schedule before planting, ensuring you have time, equipment, and recipes ready for a sudden abundance of ripe tomatoes.
Light: Full sun (6 or more hours of direct sunlight a day). Soil: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 10 ft. 0 in.. Spread: 1 ft. 0 in. - 4 ft. 0 in.. Spacing: 3 feet-6 feet. Growth rate: Rapid. Maintenance: High. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.
Harvesting
Determinate Roma tomatoes reach peak harvest readiness when they display a deep, glossy red color throughout the fruit and yield slightly to gentle hand pressure, signaling optimal ripeness for processing. Unlike indeterminate varieties that produce fruit continuously, Determinate Roma concentrates its mature crop within a narrow window of two to three weeks, allowing gardeners to harvest most fruits simultaneously for efficient canning or sauce-making. Watch for the characteristic egg shape to feel full and substantial in your palm, and plan your harvest for early morning when fruits are coolest and firmest, ensuring maximum juice content and flavor concentration for preservation projects.
The fruits are smooth, shiny, glossy, and are classified as berries. The size, shape, and color will vary depending on the variety or cultivar. The color of the fruits may be red, yellow, orange, green, purple, or pink. The fruits may contain over 100 yellow to light brown seeds.
Color: Gold/Yellow, Green, Orange, Pink, Purple/Lavender, Red/Burgundy, Variegated. Type: Berry. Length: > 3 inches. Width: > 3 inches.
Garden value: Edible, Showy
Harvest time: Fall, Summer
Edibility: The fruits or berries of the tomato are edible. They may be eaten raw, cooked, dried, or processed. They are a rich source of Vitamin A, Vitamin C, folic acid, and antioxidants. Lycopene is an antioxidant that gives the tomato its rich red color. Many plants will drop fruit when ripe or the fruit will come off easily. Tomatoes will continue to ripen once picked. Store them at room temperature.
Storage & Preservation
Store freshly harvested Determinate Roma tomatoes at room temperature (68-72°F) away from direct sunlight until fully ripe, which develops their characteristic rich flavor. Once ripe, they'll keep for 5-7 days at room temperature, or up to two weeks in the refrigerator at 50-55°F, though cold storage may dull their taste slightly. These tomatoes excel in preservation due to their meaty texture and low seed count. Canning whole or as sauce yields excellent results—their natural acidity supports safe water-bath processing. Freezing works well for cooking applications: simply halve, freeze on trays, then bag for later use in sauces and soups. Drying produces concentrated flavor; slice lengthwise to minimize seed loss and dry at 200°F until leathery. Because these are determinate varieties, plan a bulk harvest window; processing several pounds at once makes canning and sauce-making most efficient and economical.
History & Origin
Roma tomato originated in the United States during the 1950s, developed by the USDA and introduced by the Harris Seed Company as an improved paste tomato for commercial and home gardeners. The variety emerged from breeding programs focused on creating determinate plants with concentrated ripening cycles, ideal for mechanical harvesting and processing operations that dominated mid-century American agriculture. While the exact parentage remains poorly documented in accessible sources, Roma descended from Italian paste tomato traditions adapted through American breeding methodology. The determinate growth habit—which became the cultivar's defining characteristic—was deliberately selected to enhance predictable, simultaneous fruit maturation, a significant advancement over indeterminate varieties. Roma quickly became the industry standard for sauce production and home canning.
Origin: Peru
Advantages
- +Concentrated ripening window makes harvesting and processing efficient and manageable.
- +Meaty, low-seed flesh is ideal for sauces, paste, and canning applications.
- +Determinate growth habit requires minimal pruning compared to indeterminate varieties.
- +Excellent disease resistance provides reliable production with less fungicide intervention needed.
- +Compact plant size fits well in smaller garden spaces without sprawling.
Considerations
- -Susceptible to early and late blight, especially in humid or wet climates.
- -Single concentrated harvest means all fruit ripens at once, requiring immediate processing.
- -Blossom end rot risk requires consistent calcium availability and soil moisture management.
- -Multiple pest vulnerabilities including fruitworms and spider mites demand regular monitoring.
Companion Plants
Basil and French marigolds (Tagetes patula) are the two I'd put in without much debate. Basil's volatile oils seem to confuse aphids and whiteflies in the immediate vicinity — both show up reliably on Romas mid-summer — and it fills that 18-inch understory gap without competing for deep water. French marigolds specifically exude thiophenes from their roots, which suppress soil nematodes in roughly the top 6–8 inches where Roma's feeder roots do most of their work. Nasturtiums are worth squeezing in at the bed edge: they act as a trap crop, pulling aphid colonies onto themselves and off your fruit-set plants.
Fennel and Black Walnut are the two to keep well away. Fennel produces anethole, an allelopathic compound that stunts nightshades even at a few feet's distance — it's one of those plants that genuinely has no place in a mixed kitchen garden. Black Walnut releases juglone through its root system, and in our zone 7 Georgia gardens, a mature walnut tree can affect soil 50 feet or more from the trunk; Solanum lycopersicum is among the more sensitive species to it. Brassicas are a subtler problem — they're heavy feeders pulling hard on the same calcium reserves your Romas need during fruit set, and crowding them together shortchanges both crops.
Plant Together
Basil
Repels aphids, whiteflies, and hornworms while potentially improving tomato flavor
Marigold
Deters nematodes, aphids, and whiteflies with natural compounds
Parsley
Attracts beneficial insects like hoverflies and parasitic wasps
Carrots
Loosens soil for tomato roots and doesn't compete for nutrients
Nasturtium
Acts as trap crop for aphids and cucumber beetles
Oregano
Repels pests and may enhance tomato flavor through aromatic compounds
Peppers
Similar growing requirements and may deter some common pests
Lettuce
Utilizes space efficiently as ground cover and matures before tomatoes peak
Keep Apart
Black Walnut
Produces juglone toxin that causes wilting and stunted growth in tomatoes
Fennel
Inhibits tomato growth through allelopathic compounds
Brassicas
Compete for nutrients and may stunt tomato growth when planted nearby
Corn
Both attract similar pests like corn earworm and compete for nitrogen
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #321360)
Pests & Disease Resistance
Resistance
Good resistance to verticillium wilt, fusarium wilt, and tobacco mosaic virus (VFN).
Common Pests
Aphids, whiteflies, tomato fruitworm, spider mites
Diseases
Early blight, late blight, bacterial spot, blossom end rot
Troubleshooting Determinate Roma
What you'll see, why it happens, and what to do about it.
Large gray-green patches of foliage collapsing fast — sometimes overnight — with dark, water-soaked rotted spots appearing on fruit at the same time
Likely Causes
- Late blight (Phytophthora infestans) — a water mold that spreads aggressively in cool, wet weather, especially when nights drop below 65°F and humidity stays high
- Crowded canopy that traps moisture and slows leaf drying
What to Do
- 1.Pull and bag infected plants immediately — do not compost them; late blight spreads fast enough to take out neighboring rows within days
- 2.Apply a copper-based fungicide (copper hydroxide or copper sulfate) on any plants that still look clean; reapply every 7 days if wet weather continues
- 3.NC State's Plant Disease and Insect Clinic monitors late blight statewide — timing of first appearance varies year to year, so check their updates before the season starts rather than waiting for symptoms
Flat, leathery brown or black patch on the blossom end of fruit, usually showing up on the first heavy set
Likely Causes
- Blossom end rot — calcium deficiency in the developing fruit, typically caused by uneven soil moisture rather than a true shortage of calcium in the ground
- Letting the soil dry out too far between waterings during fruit set, which shuts down calcium uptake even when Ca is present
What to Do
- 1.Mulch the bed with 3–4 inches of straw to buffer soil moisture swings — this does more than any spray-on calcium product
- 2.Water consistently: Roma tomatoes need roughly 1–1.5 inches per week and don't tolerate boom-or-bust irrigation cycles
- 3.If your soil pH sits below 6.0, lime it into the 6.0–7.0 range; low pH ties up calcium regardless of how much is in the ground
Frequently Asked Questions
How long does determinate Roma tomato take to grow?▼
Is Roma tomato good for beginners?▼
Can you grow Roma tomatoes in containers?▼
What does Roma tomato taste like?▼
When should I plant Roma tomato seeds?▼
Roma vs San Marzano tomatoes - what's the difference?▼
Growing Guides from Wind River Greens
Where to Buy Seeds
Sources & References
External authority sources used in compiling this guide.
See the Methodology page for how this data is sourced, what's AI-assisted, and known limitations.