How to Grow Costoluto Genovese Tomato
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Costoluto Genovese Tomato
Solanum lycopersicum 'Costoluto Genovese'
vegetableCostoluto Genovese is a heirloom Italian tomato variety prized for its deeply ridged, flattened globe shape and exceptional flavor. This determinate to semi-determinate plant produces medium-sized fruits (3-4 oz) with complex, sweet taste and is ideal for fresh eating and sauce-making. A classic cultivar from Genoa, Italy, it has been cherished by gardeners for over a century.
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Example Costoluto Genovese Tomato timeline · Pittsburgh, PA (Zone 6b)
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Plant Costoluto Genovese Tomato
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Costoluto Genovese Tomato
Around Jul 1≈ 75 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-9; can be grown in zones 3-4 with season extension techniques
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Seedling
3-4 weeksTiny plants with 2-4 true leaves, delicate and pale green
Keep soil consistently moist but not waterlogged; provide 14-16 hours of bright light; maintain 70-75°F; avoid leggy growth by keeping light source close
Vegetative
4-6 weeks post-transplantRobust growth with bushy foliage; main stem thickening and branching; no flowers yet
Harden off transplants over 7-10 days before planting; plant deep; install stakes or cages early; prune suckers if desired; maintain consistent moisture; apply mulch
Flowering
3-4 weeksSmall yellow flowers appear in clusters; plant reaches mature height; first flower clusters visible at nodes
Ensure consistent watering and full sun; avoid over-nitrogen which delays fruiting; gently shake plants when flowering for better pollination; continue staking support
Fruit Development
4-6 weeksGreen marble-sized tomatoes appear; fruit grows larger with characteristic deep ridges; fruit size increases to 3-4 oz
Maintain even moisture to prevent cracking and blossom-end rot; apply calcium if needed; reduce nitrogen; continue pruning lower foliage for air circulation; watch for pests
Ripening & Harvest
2-4 weeksFruit transitions from green to red; develop full deep ridges and characteristic flattened globe shape; intense flavor develops
Reduce watering slightly as fruit ripens; harvest when fully red and slightly soft; can pick at breaker stage and ripen indoors; continue harvesting to encourage production
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick; encourage parasitic wasps; neem oil spray; Bacillus thuringiensis (Bt)
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Yellow sticky traps; spray undersides of leaves with insecticidal soap; neem oil; reflective mulch
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Remove infected lower leaves; improve air circulation; mulch to prevent soil splash; copper fungicide; avoid overhead watering
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Remove infected foliage; fungicide spray with chlorothalonil or copper; ensure good drainage and air flow; destroy infected plants
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Remove affected leaves; improve ventilation; avoid overhead watering; copper or chlorothalonil fungicide; crop rotation
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Strong water spray; insecticidal soap; neem oil; encourage beneficial insects; reflective mulch
Uses
Fresh eating and salads
CulinaryCostoluto Genovese is renowned for its complex, balanced sweet flavor with low acidity, making it exceptional for fresh eating, slicing, and heirloom tomato salads where the texture and taste can be fully appreciated. [source]
Italian cooking and pesto base
CulinaryA classic choice for traditional Italian pasta sauces, fresh passata, and the foundation of authentic Genoese cuisine. Its meaty texture and rich flavor make it ideal for slow-cooked sauces and preserves. [source]
Juice and paste production
CulinaryThe high flesh-to-seed ratio and meaty interior make Costoluto Genovese excellent for making tomato juice, paste, and concentrated sauces with less cooking time. [source]
Canning and preservation
HouseholdWell-suited for home canning, freezing, and bottling due to its balanced acidity (pH around 4.3) and excellent keeping quality. Produces flavorful preserved products for year-round use. [source]
Beneficial insect attraction
WildlifeThe flowers attract native pollinators and beneficial insects. Companion plants like basil and borage further enhance biodiversity in the garden ecosystem. [source]
Harvest Tips
Pick tomatoes when fully red and slightly yielding to gentle pressure; usually 75-85 days after transplanting. For best flavor, harvest in morning after dew dries. Can pick at breaker stage (first blush of color) and ripen indoors at room temperature. Costoluto Genovese is best harvested fully ripe on the vine. Continue harvesting to encourage more fruit production. Store at room temperature; do not refrigerate as cold damages flavor.
Fun Facts
- 🌱 Costoluto Genovese is an Italian heirloom dating back to the 1800s, named for the city of Genoa where it originated and became a staple of Mediterranean cuisine.
- 🌱 The characteristic deep ridges (costoluto means 'ribbed' in Italian) serve both aesthetic and functional purposes—they create more surface area for flavor concentration and make slicing easier while reducing seed cavity size.
- 🌱 This variety is one of the few tomatoes that maintains exceptional flavor even when grown in cooler climates, making it a favorite of heirloom enthusiasts in northern regions.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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