Tomato
Solanum lycopersicum
About Tomato
The tomato is the world's most widely grown vegetable crop, cultivated across every continent except Antarctica. A warm-season crop requiring 60-90 days to fruit maturity, tomatoes are grown commercially and by smallholder farmers throughout the tropics, subtropics, and temperate regions. They are rich in lycopene, vitamins A and C, and potassium. Tomatoes can be grown in open fields, greenhouses, or containers. They are classified as determinate (bush type, sets fruit all at once) or indeterminate (vining, continuous production). Major production regions include China, India, Turkey, the United States, and Egypt. In sub-Saharan Africa, tomato is the most important vegetable crop, providing income and nutrition to millions of smallholder farming families.
Growing Conditions
Full sun — minimum 6-8 hours direct sunlight daily
Regular, consistent watering — 25-50 mm per week. Avoid overhead irrigation to reduce foliar disease. Drip irrigation ideal.
Well-drained, fertile loam with pH 6.0-6.8. Rich in organic matter. Avoid waterlogged or compacted soils.
Optimal 21-27°C daytime, 15-20°C nighttime. Fruit set fails above 35°C or below 10°C.
Moderate (50-70%). High humidity promotes foliar diseases (late blight, bacterial spot).
Warm season — plant after last frost. In tropics, can be grown year-round with irrigation.
Step-by-Step Growing Tips
Start seeds indoors 6-8 weeks before transplanting
Harden off seedlings for 7-10 days before field planting
Stake or cage indeterminate varieties for better air circulation and fruit quality
Mulch around plants to conserve moisture and reduce soil splash diseases
Prune suckers on indeterminate types for larger fruit and earlier ripening
Rotate with non-solanaceous crops for at least 3 years
Disease Risks to Watch
All diseases →Tomato early blight is caused by the fungus Alternaria solani. It produces dark brown spots with concentric rings on lower leaves, spreading upward. Manage with crop rotation, resistant varieties, mulching to prevent soil splash, and fungicide applications of chlorothalonil or copper-based products when symptoms first appear.
Tomato late blight is caused by Phytophthora infestans. It creates water-soaked gray-green lesions that rapidly turn dark brown, with white mold on leaf undersides in humid conditions. It can destroy crops in days. Apply preventive copper or mancozeb sprays, destroy infected plants immediately, and use resistant varieties like Mountain Magic or Defiant.
Tomato yellow leaf curl virus (TYLCV) is a begomovirus spread by whiteflies (Bemisia tabaci). Infected plants show upward leaf curling, yellowing leaf margins, stunted growth, and flower drop. There is no cure — management relies on resistant varieties, whitefly control with neem or imidacloprid, reflective mulches, and insect-proof netting.
Tomato Fusarium wilt (Fusarium oxysporum f. sp. lycopersici) causes yellowing starting on one side of the plant, wilting, and brown vascular discoloration in stems. The fungus persists in soil for decades. Manage with resistant varieties carrying I, I-2, I-3 genes, grafting onto resistant rootstock, crop rotation, and raising soil pH to 6.5-7.0.
Companion Planting
✅ Good Companions
❌ Avoid Nearby
Growing Zones
Frequently Asked Questions
When is the best time to plant Tomato?
Warm season — plant after last frost. In tropics, can be grown year-round with irrigation.
What soil does Tomato need?
Well-drained, fertile loam with pH 6.0-6.8. Rich in organic matter. Avoid waterlogged or compacted soils.
How much water does Tomato need?
Regular, consistent watering — 25-50 mm per week. Avoid overhead irrigation to reduce foliar disease. Drip irrigation ideal.
What are the most common diseases affecting Tomato?
The most common diseases are: tomato early blight, tomato late blight, tomato leaf curl virus, tomato fusarium wilt. Monitor regularly and practice crop rotation.
What plants grow well with Tomato?
Good companions include: basil, marigold, carrot, parsley. Avoid planting near fennel, brassicas, walnut.
Related Crops — Solanaceae
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