Water your tomato plant deeply and consistently
Tomato plants need steady moisture, not daily sprinkles. Water at the soil level—not the leaves—once or twice a week, depending on heat and rainfall. Push your finger two inches into the soil; if it feels dry, water. If it still feels moist, wait another day or two.
In hot weather (above 85°F), you may need to water every other day. In cooler weather or after rain, you might water only once a week. The goal is soil that stays consistently moist but never waterlogged. Soggy soil invites root rot and fungal disease. A soaker hose or drip line works better than overhead watering because it keeps water off the leaves, where disease starts.
Water early in the morning so any splash dries quickly. If you water in the evening, moisture lingers on leaves overnight, creating conditions for powdery mildew and early blight.
Key Takeaways
- Water at soil level once or twice weekly, aiming for soil that stays moist but not soggy, and water in early morning to prevent leaf disease.
- Tomato plants need six to eight hours of direct sunlight daily and grow best in temperatures between 65°F and 85°F.
- Stake or cage your plant early—within two to three weeks of planting—to support the stem and keep fruit off the ground.
- Pinch off suckers (shoots that grow between the main stem and branches) on indeterminate varieties to direct energy toward fruit rather than leaves.
- Feed every two to three weeks with a balanced fertilizer once the plant flowers, or use a slow-release fertilizer at planting time.
Provide six to eight hours of direct sunlight daily
Tomato plants are sun-hungry. They need at least six hours of direct sunlight to produce fruit, and eight hours is better. Without enough light, plants grow tall and spindly, produce fewer flowers, and the fruit that does form ripens slowly.
Plant in a spot that gets morning sun—this dries dew and reduces disease. If you're growing in containers, move them throughout the day to follow the sun, or place them in a fixed spot that receives afternoon sun. In very hot climates (above 95°F regularly), afternoon shade between 2 p.m. and 4 p.m. can prevent sunscald on the fruit, but don't sacrifice total light hours.
Support the stem with a stake or cage early
Install a support system within two to three weeks of planting, before the plant gets heavy. Waiting until the plant is tall and loaded with fruit risks breaking branches and damaging roots when you drive a stake into the ground.
A tomato cage (the wire cylinder kind) works for determinate varieties, which grow to a fixed height and stop. For indeterminate varieties (which grow and produce all season), a stake or string system works better because the plant will outgrow a cage. Drive a wooden stake or metal rod at least two feet into the ground, leaving four to five feet above soil. Tie the main stem loosely to the stake every eight to twelve inches as it grows, using soft cloth strips or tomato clips so you don't cut into the stem.
Keeping fruit off the soil prevents rot and pest damage. A supported plant also dries faster after rain and is easier to harvest.
Remove suckers on indeterminate plants
On indeterminate varieties (the ones that keep growing), small shoots called suckers grow in the angle between the main stem and each branch. These shoots will become full branches if left alone, creating a dense tangle of leaves that shades fruit and wastes energy.
Pinch off suckers when they're small—one to two inches long—by snapping them off with your thumb and forefinger. Do this every week or two during the growing season. You don't need to remove suckers on determinate varieties; they're bred to grow as a bush and stop, so the extra growth is part of their natural shape.
Feed your plant every two to three weeks once it flowers
Tomato plants don't need heavy feeding early on. If you mixed compost or balanced fertilizer into the soil at planting, the plant has enough nutrients to grow for the first month. Once flowers appear, the plant is working hard to set and develop fruit, and that's when feeding matters.
Use a balanced fertilizer (equal parts nitrogen, phosphorus, and potassium—look for something like 10-10-10 on the label) every two to three weeks. Follow the package rate; too much nitrogen pushes leaf growth at the expense of fruit. Alternatively, use a slow-release fertilizer at planting time and skip weekly feeding. Water-soluble fertilizers work fastest if you need a quick boost; granular or pellet fertilizers release slowly over weeks.
Avoid high-nitrogen fertilizers (the first number much larger than the others), which produce leafy plants with few tomatoes.
Watch for common pests and diseases
Early blight appears as brown spots with concentric rings on lower leaves, usually in mid-summer. Remove affected leaves and improve air flow by pruning lower branches. Water at soil level only, never overhead.
Powdery mildew looks like a white dust on leaves. It thrives in warm, dry conditions with poor air circulation. Space plants far enough apart that air moves between them, and water in the morning so leaves dry quickly.
Hornworms are large green caterpillars that eat leaves and fruit. Hand-pick them or spray with neem oil if the infestation is heavy. Aphids cluster on new growth and suck sap; spray with water to dislodge them, or use insecticidal soap if they return.
The best defense is spacing plants 24 to 36 inches apart for air flow, removing lower leaves once the plant is established, and watering only at soil level.
Harvest fruit when it reaches full color
Tomatoes ripen from the inside out. Pick them when they're fully colored but still slightly soft—they'll taste better and continue ripening off the vine. In cool weather, pick tomatoes at the "breaker stage" (when the first blush of color appears) and let them ripen indoors on a windowsill.
If frost is coming and you have green tomatoes still on the vine, pick them all. Place them in a cardboard box with a ripe banana or apple (which release ethylene gas) and store in a cool room. They'll ripen over one to three weeks.
Frequently Asked Questions
How often should I water if it rains?
Check the soil two days after rain. If the top two inches feel moist, skip watering. If it feels dry, water as usual. Heavy rain can provide a week's worth of moisture, while a light shower may add only a day or two. Adjust based on what the soil tells you, not a fixed schedule.
Can I grow tomatoes in a pot?
Yes. Use a container at least five gallons for determinate varieties and ten gallons for indeterminate types. Fill with potting soil (not garden soil), water more often because pots dry faster than ground soil, and feed every two weeks once flowers appear. Containers need the same six to eight hours of sun and the same support system as in-ground plants.
Why are my tomatoes splitting or cracking?
Splitting happens when the fruit absorbs water too quickly after a dry spell, usually after heavy rain or a sudden increase in watering. Keep soil moisture steady rather than swinging between dry and wet. Mulch around the plant to regulate soil moisture and reduce the impact of rain.
What's the difference between determinate and indeterminate tomatoes?
Determinate varieties grow to a fixed height (usually 3 to 4 feet), produce most of their fruit at once, and stop growing. They're good for canning and small spaces. Indeterminate varieties grow continuously, produce fruit all season, and can reach 6 feet or taller. They need staking and sucker removal but produce longer.
Should I remove leaves from my tomato plant?
Yes, but selectively. Remove leaves that touch the ground or show disease. Once the plant is tall and has many branches, remove lower leaves (up to the first flower cluster) to improve air flow and reduce disease. Never strip the plant bare; leaves feed the fruit. Remove no more than one-third of the foliage at a time.