Start with the right variety for your space and climate

The single biggest factor in growing great tomatoes is choosing a variety that actually works where you live. Determinate varieties (bush types) grow to a fixed size and produce most of their fruit at once—they work well in containers and small spaces. Indeterminate varieties (vining types) keep growing and producing all season, need staking or caging, and give you tomatoes from mid-summer until frost. Check your local frost dates: if your first frost comes in September, choose early-maturing varieties like 'Early Girl' or 'Siberia'. If you have a long season, you can grow slower varieties like 'Brandywine' or 'Cherokee Purple'.

Seed packets and nursery labels list days to maturity—the number of days from transplant to first ripe fruit. Add 7 to 10 days to account for the time from seed to transplant-ready seedling. If your frost date is October 15 and a variety needs 85 days to mature, you need to transplant by late July at the latest. Cherry tomatoes like 'Sungold' and paste tomatoes like 'San Marzano' are reliable producers in most climates.

Key Takeaways

  • Plant tomatoes in full sun (at least 6 to 8 hours daily) in soil rich with compost or aged manure, keeping the soil consistently moist but not waterlogged.
  • Space plants 24 to 36 inches apart depending on variety, and bury the stem deeper than it was growing in the pot to encourage a stronger root system.
  • Indeterminate varieties need staking or caging from the moment you plant them; determinate types need less support but still benefit from a cage.
  • Water deeply at the soil level early in the morning, aiming for 1 to 2 inches per week, and mulch around the base to keep roots cool and reduce disease.
  • Prune suckers (shoots growing between the main stem and branches) on indeterminate varieties to direct energy into fruit rather than foliage.

Prepare soil and location before planting

Tomatoes need full sun—at least 6 to 8 hours of direct sunlight daily. Less light means slower growth, fewer flowers, and less flavorful fruit. Choose a spot that gets morning sun; morning light dries dew and reduces fungal disease. Afternoon shade in very hot climates (above 90°F regularly) can prevent sunscald on fruit, but tomatoes still need 6 hours minimum.

Soil matters more than most gardeners realize. Tomatoes are heavy feeders and need rich, well-draining soil. Work 2 to 3 inches of compost or aged manure into the top 8 to 10 inches of soil before planting. If your soil is clay-heavy and drains poorly, build a raised bed or mound rather than planting in the ground. Tomatoes hate wet feet; soggy soil causes root rot and fungal diseases like early blight. Soil pH should be between 6.0 and 6.8—most home soils fall in this range, but if you have very acidic or alkaline soil, a straightforward test kit from a garden center will tell you whether to amend.

Plant seedlings deep and space them properly

Start seeds indoors 6 to 8 weeks before your last spring frost, or buy transplants from a nursery. When seedlings are 6 to 8 inches tall with their first true leaves (the second set of leaves that appear), they are ready to go in the ground. Harden them off first by setting them outside in a sheltered spot for a few hours each day, gradually increasing exposure over a week. This prevents transplant shock.

Bury the stem deeper than it was growing in the pot—up to the first true leaves. Tomato stems develop roots all along their buried length, creating a stronger root system that reaches deeper water and nutrients. Space plants 24 to 36 inches apart depending on variety; indeterminate types need more room because they grow larger. At planting time, install a cage or stake for indeterminate varieties. Trying to stake a plant after it is already 2 feet tall damages roots and branches.

Water consistently and deeply

Inconsistent watering is the reason most home tomatoes crack, develop blossom-end rot (dark sunken spots on the bottom of the fruit), or taste bland. Aim for 1 to 2 inches of water per week, delivered in one or two deep soakings rather than daily sprinkles. Water at soil level in the early morning—never overhead, because wet foliage invites fungal disease. If you water in the evening, leaves stay wet overnight, which is when disease spreads fastest.

Mulch around the base of each plant with 2 to 3 inches of straw or shredded leaves, keeping mulch 2 inches away from the stem. Mulch keeps soil temperature steady, reduces water loss, and prevents soil from splashing onto lower leaves (where disease spores live). In very hot climates, mulch also keeps roots cooler. During fruit set (when flowers are turning into small tomatoes), consistent water is critical—this is when blossom-end rot develops if watering is erratic.

Support indeterminate varieties and prune for better fruit

Indeterminate tomatoes grow indefinitely and need support to keep fruit off the ground and improve air circulation. Use a sturdy cage at least 5 feet tall, or drive a 6-foot stake into the ground at planting and tie the main stem loosely with soft ties every 12 inches as it grows. Determinate varieties are bushier and lower-growing; a 4-foot cage usually suffices, though some gardeners skip support entirely for determinate types.

Pruning suckers on indeterminate varieties directs energy into fruit rather than foliage. A sucker is a shoot that grows in the angle between the main stem and a branch. Pinch or cut these off when they are small (2 to 4 inches long). Do not remove the main stem or the branches that carry flowers. Stop pruning in late summer so the plant can focus on ripening the fruit already on it rather than growing new branches. Determinate varieties do not need sucker pruning because they naturally stop growing at a set height.

Manage common pests and diseases

Early blight appears as brown spots with concentric rings on lower leaves, usually starting in mid-summer when humidity is high. Remove affected leaves as soon as you see them, and do not compost them—throw them away. Water at soil level only, never overhead. Space plants far enough apart that air flows between them. If early blight spreads despite these steps, a fungicide containing copper or sulfur can slow it, but prevention is far more effective than treatment.

Hornworms are large green caterpillars that can defoliate a plant in days. Hand-pick them in early morning or late evening when they are most active. Whiteflies and spider mites appear in hot, dry conditions; a strong spray of water from the hose knocks them off, and repeating every few days controls them. Blossom-end rot (dark sunken spots on fruit) is not a disease but a calcium deficiency caused by inconsistent watering—it cannot be cured once it appears on a fruit, but consistent watering prevents it on new fruit.

Harvest ripe fruit and extend the season

Tomatoes develop full flavor only when fully ripe. A ripe tomato is deeply colored (red, pink, yellow, or whatever the variety is), yields slightly to gentle pressure, and comes off the vine with a light twist. Picking at this stage also signals the plant to keep flowering and setting new fruit. If you pick green tomatoes in late summer before frost, they will ripen indoors on a windowsill or in a paper bag with a ripe banana (the ethylene gas speeds ripening).

To extend the season into fall, pinch off new flowers in late summer so the plant stops setting new fruit and focuses energy on ripening what is already there. In early fall, when nighttime temperatures drop below 55°F, tomato plants stop ripening fruit on the vine. At that point, pick all remaining fruit—ripe, turning, or green—and ripen them indoors. A plant that produces steadily from July through September has given you far more than one that tries to set fruit until the first frost and ends up with mostly green tomatoes.

Frequently Asked Questions

Can I grow tomatoes in containers?

Yes. Use a pot at least 5 gallons for determinate varieties and 10 gallons for indeterminate types. Fill with potting mix (not garden soil), water more frequently because containers dry out faster, and feed every 2 to 3 weeks with a balanced fertilizer. Containers warm up faster in spring, so you can plant earlier, but they also dry out and heat up more in summer.

Why are my tomatoes splitting or cracking?

Cracking happens when watering is uneven—the plant gets a heavy rain or deep watering after a dry spell, and the fruit absorbs water too fast and splits. Water consistently throughout the season, mulch to keep soil moisture steady, and choose crack-resistant varieties like 'Stupice' or 'San Marzano' if you live in a rainy climate.

Do I need to fertilize tomatoes?

If your soil is rich with compost, tomatoes usually produce well without added fertilizer. If growth is slow or leaves are pale, feed every 3 to 4 weeks with a balanced fertilizer (equal nitrogen, phosphorus, and potassium) or one slightly higher in phosphorus to encourage flowering. Too much nitrogen produces leafy plants with few flowers.

What is the difference between determinate and indeterminate tomatoes?

Determinate varieties grow to a fixed size, produce most fruit at once, and stop growing. They work well in containers and small spaces. Indeterminate varieties keep growing and producing all season until frost, need staking, and give you a steady harvest over months.

When should I start seeds indoors?

Start seeds 6 to 8 weeks before your last spring frost date. Look up your frost date online using your zip code. Seeds germinate in 5 to 10 days at 70 to 75°F and are ready to transplant outdoors when they have their first true leaves and are 6 to 8 inches tall.