Start with the right soil and sunlight

Tomatoes need at least six to eight hours of direct sunlight each day to produce fruit and develop flavor. Plant them in a spot that gets morning sun — this dries dew off the leaves and reduces disease. If your yard has less light, choose determinate varieties (bush types that fruit all at once) rather than indeterminate ones (vining types that produce all season), since bush tomatoes are more forgiving in partial shade.

Use soil that drains well. Tomatoes rot if water sits around their roots. Mix compost or aged manure into garden soil before planting, or use a potting mix rated for vegetables if you are growing in containers. The soil should feel crumbly and dark, not dense or clay-heavy. If your garden soil is mostly clay, build a raised bed or mound instead of digging a hole.

Key Takeaways

  • Plant tomatoes in soil that drains well and gets six to eight hours of direct sun each day.
  • Bury the stem deeper than it was in the pot — roots will form along the buried stem and strengthen the plant.
  • Water at the soil level, not on the leaves, and keep the soil consistently moist but not waterlogged.
  • Prune suckers (shoots that grow between the main stem and branches) on indeterminate varieties to direct energy into fruit instead of leaves.
  • Harvest tomatoes when they are fully colored but still slightly firm — they will continue to ripen off the vine.

Plant deeper than the nursery pot

When you set the tomato in the ground, bury it deeper than it was growing in its container. Bury the stem up to the lowest set of leaves. Roots will form all along the buried stem, creating a stronger root system that can reach deeper water during dry spells. This is one of the most important steps and makes a real difference in how well the plant handles heat and drought later in the season.

Space plants two to three feet apart — they need air circulation to stay healthy. If you are planting indeterminate varieties that will grow tall, set a cage or stake in the ground at planting time rather than later, when you risk damaging roots. Determinate bush types need less support but still benefit from a cage to keep fruit off the soil.

Water consistently at soil level

Tomatoes need steady moisture. Water deeply at the base of the plant, not on the leaves — wet foliage invites fungal diseases like early blight and powdery mildew. The soil should feel moist two inches down, but not soggy. In hot weather, this usually means watering every two to three days. In cooler weather or after rain, check the soil before watering again.

Inconsistent watering causes problems. If the soil dries out and then gets soaked, the fruit cracks or develops blossom end rot (a dark, sunken spot on the bottom of the tomato). Mulch around the base with two inches of straw or shredded leaves to keep soil temperature steady and reduce how often you need to water. Keep mulch a few inches away from the stem to prevent rot.

Prune suckers on vining tomatoes

Indeterminate tomatoes (the tall, vining kinds) grow suckers — shoots that sprout between the main stem and the branches. These suckers will grow into full branches if you leave them, which means more leaves but fewer tomatoes. Pinch off suckers when they are small, leaving just the main stem and the main branches. This redirects the plant's energy into fruit instead of foliage.

Determinate bush tomatoes do not need this pruning — they are bred to grow as a compact plant and produce most of their fruit at once. If you are unsure which type you have, check the seed packet or plant label. Indeterminate varieties will say "vining" or list a height of five feet or more. Determinate types will say "bush" or "compact" and reach three to four feet tall.

Recognize and treat common problems

Early blight appears as brown spots with concentric rings on lower leaves, usually in mid to late summer. Remove the affected leaves and improve air circulation by pruning lower branches. Water only at soil level, never on leaves. If the problem spreads, spray with a fungicide labeled for tomatoes — sulfur or copper-based products work well and are available at garden centers.

Blossom end rot shows as a dark, sunken spot on the bottom of the fruit. It is caused by inconsistent watering and low calcium. Water deeply and regularly, and mulch to keep soil moisture steady. Affected fruit cannot be saved, but new fruit forming higher on the plant will be fine if you fix the watering pattern. Powdery mildew (a white coating on leaves) also improves with better air circulation and consistent watering at the soil level.

Know when and how to harvest

Pick tomatoes when they are fully colored but still slightly firm to the touch. A ripe tomato should yield a little when you squeeze it gently, but not be mushy. Tomatoes picked at this stage will continue to ripen off the vine and develop full flavor. Leaving them on the plant until they are very soft makes them more likely to split or crack, especially if rain comes after a dry spell.

In late summer, when frost is coming in four to six weeks, pinch off new flower clusters so the plant puts energy into ripening the fruit already on the vine rather than starting new fruit that will not mature. If frost arrives before all your tomatoes ripen, pick the mature green ones (full-sized but still green) and set them on a windowsill indoors — they will ripen slowly over two to three weeks.

Frequently Asked Questions

Can I grow tomatoes in a pot?

Yes. Use a pot at least five gallons for determinate varieties and ten gallons for indeterminate types. Fill it with potting mix, not garden soil. Containers dry out faster than garden beds, so check the soil daily and water when the top inch feels dry. Tomatoes in pots need the same sunlight and feeding as garden plants.

Why are my tomatoes not flowering?

Too much nitrogen fertilizer causes lush leaves but few flowers. Switch to a fertilizer higher in phosphorus and potassium (the second and third numbers on the label). Too much shade also prevents flowering — tomatoes need six to eight hours of direct sun. If your plant is young, it may straightforward need more time; most varieties start flowering four to six weeks after planting.

What is the difference between determinate and indeterminate tomatoes?

Determinate (bush) tomatoes grow to a set height, usually three to four feet, and produce most of their fruit within a short window. Indeterminate (vining) tomatoes keep growing taller all season and produce fruit continuously until frost. Determinate types are good for canning because the harvest is concentrated; indeterminate types are better for fresh eating because they produce steadily.

How do I know if my tomato is ripe?

A ripe tomato is fully colored (red, pink, yellow, or orange depending on variety) and yields slightly when you squeeze it gently. It should smell fragrant near the stem. If it is hard and bright colored, it needs more time. If it is very soft or has wrinkled skin, it is overripe and may taste mealy.