Roma Tomato

A paste-type tomato with thick, meaty walls and few seeds, ideal for making sauces, pastes, and canning. Roma types are typically determinate, producing their crop over a concentrated period which is convenient for batch processing. The firm flesh holds up well when cooked down and develops a rich, concentrated flavor. Stake plants and allow fruits to ripen fully on the vine for the deepest red color and best cooking quality.

Start Roma tomato seeds indoors 6-8 weeks before the last frost. Sow 6mm (1/4 inch) deep in moist seed-starting mix at 24-29°C (75-85°F). Germination takes 5-10 days. Provide 14-16 hours of strong light daily from grow lights. Pot up to 10 cm containers when first true leaves appear. Begin hardening off 7-10 days before transplanting. Set transplants deeply, burying the stem up to the lowest leaves for stronger root development. Roma tomatoes are not typically direct-sown due to their 75-day maturity requirement. For continuous sauce supply, make two plantings 2-3 weeks apart so determinate crops mature in sequence rather than all at once.

Roma tomatoes are the go-to paste and sauce tomato, bred specifically for thick-walled, meaty flesh with low moisture content and few seeds. Most Roma varieties are determinate, meaning they grow to a fixed height (90-120 cm), set a large crop over 2-3 weeks, then decline — this concentrated harvest is ideal for batch canning and sauce-making. Start seeds indoors 6-8 weeks before the last frost, sowing 6mm deep at 24-29°C (75-85°F).

Transplant outdoors after all frost danger has passed, spacing determinate varieties 45-60 cm apart with 90 cm between rows. Determinate Romas need less pruning than indeterminate types — remove suckers only below the first flower cluster and let the plant branch naturally above. Provide moderate support with a short stake or cage to keep fruit off the ground, as the concentrated fruit load can topple unsupported plants.

Water consistently at the base, providing 2.5-5 cm per week. Roma types are somewhat more susceptible to blossom end rot than cherry tomatoes, so maintaining even moisture is critical. Reduce watering slightly as fruits approach full ripeness to concentrate flavors — this is especially important for sauce-making quality. Allow fruits to ripen fully on the vine until deep red for the highest sugar content and thickest flesh. The determinate habit makes Romas excellent for regions with shorter growing seasons, as the entire crop matures before early fall frosts.

Basil is the essential Roma tomato companion — the aromatic oils may improve tomato flavor and help repel aphids, whiteflies, and mosquitoes. Parsley attracts beneficial hoverflies that prey on aphid populations. Garlic planted nearby deters red spider mites. Avoid planting near cabbage family crops, which are allelopathically incompatible with tomatoes. Fennel inhibits tomato growth and should be planted far away. Marigolds suppress root-knot nematodes in the soil. Asparagus and tomatoes have a beneficial mutual companion relationship.

Roma tomatoes need rich, well-drained soil with a pH of 6.2-6.8. Incorporate compost and a slow-release tomato fertilizer at planting. Because determinate varieties set their entire crop at once, they benefit from a higher phosphorus fertilizer (5-10-10) that supports heavy fruit set. Side-dress with balanced fertilizer when fruits begin forming. Calcium is especially critical for Roma types, which are more prone to blossom end rot than other tomatoes — apply gypsum or calcium sulfate if soil tests show deficiency. Avoid excessive nitrogen, which delays ripening and produces watery flesh unsuitable for sauce-making. Consistent moisture via drip irrigation is the single most important factor for quality paste tomatoes.

Ideal Temperature

Hardiness Zone Compatibility

Allow Roma tomatoes to ripen fully on the vine until deep, uniform red for the best sauce-making quality — underripe fruits lack the sugar concentration needed for rich sauces. Ripe Romas feel slightly firm with a little give when gently squeezed. Since determinate varieties ripen their crop over a concentrated 2-3 week period, plan to process large batches at once. Harvest with a gentle twist or cut the stem with pruners, leaving a small stem cap attached. If frost threatens before full ripeness, harvest entire plants and hang upside down indoors where green fruits will ripen slowly. Roma tomatoes are less prone to cracking than other types due to their thick walls.

Storage & Preservation

Roma tomatoes are bred for preservation. For canning, blanch in boiling water for 30-60 seconds, peel, and process in a water bath with added lemon juice or citric acid for safe acidity. Their low moisture content makes them ideal for oven-dried or sun-dried tomatoes — halve, seed lightly, and dry at 93°C (200°F) for 6-8 hours. Freezing is the simplest method: wash, core, and freeze whole on baking sheets, then bag — skins slip off easily when partially thawed. Roma sauce freezes beautifully for up to 12 months. Fresh Romas store at room temperature for 5-7 days. Tomato paste made from concentrated Roma puree freezes in ice cube trays for convenient portioned use.

Troubleshooting Common Problems

Blossom end rot is the most common Roma tomato complaint — the thick-walled fruits are particularly prone to calcium deficiency caused by irregular watering. Maintain consistent deep watering and mulch heavily. Determinate varieties produce their entire crop at once, which can overwhelm home canners — stagger plantings 2 weeks apart for a more manageable harvest. Cracked or split fruit occurs from heavy rain after drought but is less severe in Romas than slicing types. Low sugar content or bland flavor results from overwatering or harvesting before full vine-ripeness. Gray wall (uneven internal ripening) occurs in cool, cloudy weather.

Growing Tips

1. Bury transplants deeply — remove the lower leaves and bury two-thirds of the stem underground. Every buried node produces new roots, creating a massively stronger root system that improves water and nutrient uptake throughout the season.
2. Water at the base only, never overhead. Wet foliage is the primary driver of fungal diseases like early blight and septoria leaf spot. Drip irrigation or soaker hoses are ideal. Water in the morning so any splash dries quickly.
3. Mulch heavily with 8-10 cm of straw or shredded leaves once the soil has warmed. Mulch suppresses weeds, conserves moisture, moderates soil temperature, and — critically — prevents rain from splashing soil-borne disease spores onto lower leaves.
4. For determinate Romas, only remove suckers below the first flower cluster. Unlike indeterminate tomatoes that benefit from aggressive pruning, determinate plants need their upper branches to produce the concentrated fruit load that defines their growth habit.
5. Calcium availability is the key to preventing blossom end rot, and consistent watering is the key to calcium availability. The calcium is in your soil — the plant just cannot transport it when moisture fluctuates. Even, deep watering solves most blossom end rot problems.
6. Stagger plantings by 2-3 weeks for a more manageable harvest. Since determinate Romas ripen their entire crop at once, a single planting can overwhelm even experienced canners. Two plantings spaced apart give you two manageable processing sessions instead of one enormous one.
7. Remove all lower leaves up to the first fruit cluster once fruits begin to form. This improves air circulation around the base of the plant and eliminates the leaves most likely to harbor early blight and septoria leaf spot from soil splash.
8. Stop fertilizing once fruits begin to ripen. Late nitrogen causes watery, bland tomatoes and delays ripening — exactly the opposite of what you want for sauce-quality Romas. Let the plant focus its energy on concentrating sugars and flavor in the existing fruit.