Start with soil, sunlight, and the right variety for your climate

Tomatoes need six to eight hours of direct sunlight daily, well-draining soil rich in organic matter, and consistent moisture—not soggy roots. Before you plant, test your soil's pH (tomatoes prefer 6.0 to 6.8) with an inexpensive kit from any garden center. Mix in compost or aged manure a few weeks before planting to give the soil time to settle. Choose a spot where water won't pool after rain.

Pick a variety suited to your growing season. Determinate tomatoes (like Roma or Bush Early Girl) grow to a fixed size, produce most fruit at once, and work well in containers or small spaces. Indeterminate varieties (like Brandywine or Sungold) grow tall, produce fruit all season, and need staking or caging. Check your seed packet or plant label for the number of days to maturity—if your frost-free season is 100 days, choose varieties that mature in 80 to 90 days to leave a safety margin.

Key Takeaways

  • Tomatoes need at least six to eight hours of direct sun, soil with a pH between 6.0 and 6.8, and consistent watering without waterlogging.
  • Plant seedlings deeper than they grew in their pot—bury the stem up to the first true leaves to encourage a stronger root system.
  • Water at the soil level early in the morning, aiming for one to two inches per week, and avoid wetting the leaves to prevent disease.
  • Stake or cage indeterminate varieties early, before the plant is tall, to avoid damaging roots later.
  • Pinch off suckers (shoots between the main stem and branches) on indeterminate types to direct energy into fruit rather than foliage.

Planting seedlings at the right depth

Start seeds indoors six to eight weeks before your last spring frost, or buy seedlings from a nursery. Harden off seedlings by setting them outside in a sheltered spot for an hour or two, then gradually increasing exposure over five to seven days. This acclimates them to wind and direct sun.

Plant seedlings deeper than they grew in their pot—bury the stem up to the first set of true leaves (the second set of leaves that appear, not the initial seed leaves). Tomato stems buried underground will develop roots along the buried portion, creating a stronger root system. Space plants 24 to 36 inches apart, depending on the variety; indeterminate types need more room. Water gently after planting and keep the soil moist but not waterlogged for the first two weeks.

Watering and feeding through the growing season

Water at soil level in the early morning, aiming for one to two inches per week. This includes rainfall, so measure what falls naturally and add water only if needed. Inconsistent watering—dry spells followed by heavy rain—causes blossom-end rot (dark, sunken spots on the fruit) and fruit cracking. A soaker hose or drip line delivers water directly to the roots and keeps leaves dry, which reduces fungal disease.

Fertilize every two to three weeks once the plant flowers. Use a balanced fertilizer (like 5-10-10) or one higher in phosphorus and potassium to encourage fruiting rather than excessive leaf growth. Follow the package rate and water after feeding. If leaves yellow early in the season, the plant may need nitrogen; if they stay green but fruit is sparse, reduce nitrogen and increase phosphorus.

Supporting tall plants and managing growth

Install stakes or cages early, when plants are 12 inches tall, before they're heavy with fruit. Driving a stake through roots later damages them and stresses the plant. For indeterminate varieties, use a sturdy cage at least five feet tall or tie the main stem loosely to a stake with soft ties as it grows, leaving room for the stem to expand.

Pinch off suckers—the shoots that grow between the main stem and branches—on indeterminate varieties. These shoots won't produce fruit and pull energy away from the main plant. Determinate types produce less aggressively and need less pruning. Remove only the lowest leaves once the plant is established and flowering; this improves air circulation and reduces disease pressure.

Spotting and preventing common problems

Early blight appears as brown spots with concentric rings on lower leaves, usually in mid-to-late summer. Remove affected leaves and improve air circulation by spacing plants properly and pruning lower foliage. Late blight causes water-soaked spots on leaves and fruit and spreads quickly in cool, wet weather; remove infected plants entirely and don't compost them.

Powdery mildew looks like a white coating on leaves. Spray with a sulfur-based fungicide or a baking soda solution (one tablespoon per gallon of water plus a few drops of dish soap) every seven to ten days. Blossom-end rot, a dark sunken spot on the fruit bottom, signals inconsistent watering or low calcium; mulch to regulate soil moisture and avoid overhead watering.

Hornworms are large green caterpillars that eat leaves and fruit. Hand-pick them in the early morning or late evening, or spray with spinosad (an organic insecticide) if the infestation is heavy. Whiteflies and spider mites thrive in hot, dry conditions; increase humidity by misting leaves in the morning and water consistently.

Harvesting and ripening fruit

Pick tomatoes when they reach full color but are still slightly soft to the touch. Vine-ripened fruit tastes better than store-bought, but you don't have to wait for perfect ripeness—tomatoes picked at the "breaker stage" (when the first blush of color appears) will ripen indoors in a few days. Harvest regularly to encourage the plant to keep flowering and producing.

As frost approaches in fall, pick all remaining fruit, even green ones. Ripen them indoors at room temperature away from direct sun; they'll turn color in one to three weeks. Store ripe tomatoes at room temperature, not in the refrigerator, which breaks down flavor and texture. Use them within a week for best taste.

Frequently Asked Questions

Can I grow tomatoes in a pot instead of the ground?

Yes. Use a container at least five gallons for determinate varieties and ten gallons for indeterminate types. Fill it with potting soil (not garden soil), water more frequently because containers dry faster, and feed every two weeks. Place the pot where it gets six to eight hours of sun.

Why are my tomato flowers dropping without making fruit?

Flowers drop when temperatures drop below 55°F at night or exceed 90°F during the day, when the plant is stressed by inconsistent watering, or when nitrogen is too high. Check your watering schedule, avoid over-fertilizing, and wait for more stable weather. The plant will flower again once conditions improve.

How do I know when to stop pruning and let the plant focus on ripening?

Stop heavy pruning about six weeks before your first expected fall frost. The plant needs leaves to photosynthesize and ripen fruit. You can still remove diseased or damaged leaves, but leave the canopy intact so the fruit gets the energy it needs to mature before cold weather arrives.

What's the difference between a tomato cage and a stake?

A cage surrounds the plant and supports it from all sides; it's easier to use but limits pruning and air circulation. A stake takes up less space and lets you train the plant to a single stem, improving airflow and making harvesting easier. Cages work better for determinate types; stakes suit indeterminate varieties in small gardens.