Water tomatoes deeply and consistently, not daily
Tomato plants need steady moisture, but not constant wetness. Water deeply at the base of the plant two to three times a week, depending on heat and rainfall. Soil should feel damp a few inches down when you squeeze it — not soggy, not bone-dry. Inconsistent watering causes problems: too little and the plant wilts and stops producing; too much and roots rot or the fruit cracks open when it rains after a dry spell.
Water in the early morning so the soil absorbs it before the heat of the day. Wet leaves invite fungal disease, so aim the water at the soil, not the foliage. If you live in a very hot climate or have sandy soil that drains fast, you may water every other day. If you have clay soil or regular rain, you may water only once a week. The goal is consistent moisture, not a fixed schedule.
Key Takeaways
- Water at the soil level early in the morning, aiming for damp (not wet) soil a few inches down, two to three times per week.
- Pinch off suckers — the shoots that grow between the main stem and branches — on indeterminate varieties to direct energy toward fruit.
- Provide a cage or stake for support so branches do not break under the weight of fruit and air can circulate around the plant.
- Feed every two to three weeks with a balanced fertilizer once the plant flowers, or use a slow-release fertilizer at planting time.
- Watch for yellowing leaves, brown spots, or soft spots on fruit and remove affected parts when ready to stop disease spread.
Support the plant with a cage or stake as it grows
Tomato plants become heavy once fruit develops, and unsupported branches break or rest on the ground where they rot. Install a cage or stake when you plant, not later — driving a stake through roots damages them. A sturdy cage (at least 5 feet tall for most varieties) or a single stake with soft ties works well. Tie the main stem loosely to the stake every 8 to 12 inches so the plant can still move slightly in wind.
As the plant grows, tuck branches gently into the cage or tie them up. Good support also improves air circulation, which reduces fungal disease. If you use a stake, you will need to tie the plant regularly as it grows. If you use a cage, check it weekly to make sure heavy branches are not bending out of it.
Pinch off suckers on indeterminate varieties to focus growth
Suckers are shoots that grow in the angle between the main stem and a branch. They look like small stems with leaves. On indeterminate varieties (plants that keep growing taller all season), removing suckers directs the plant's energy toward fruit instead of extra foliage. On determinate varieties (compact plants bred to fruit all at once), suckers are less of a problem and you can leave them.
Pinch suckers off by hand when they are small — just snap them between your thumb and finger. Do this weekly during the growing season. You do not need to remove every single one, but removing the largest ones makes a noticeable difference in fruit size and ripeness. Stop pinching suckers in late summer so the plant can focus on ripening the fruit already on it.
Feed the plant once it flowers
Tomatoes are heavy feeders and need nutrients throughout the season. If you mixed compost or slow-release fertilizer into the soil at planting time, you may not need to feed for the first month. Once the plant flowers, feed every two to three weeks with a balanced fertilizer (equal parts nitrogen, phosphorus, and potassium) or a fertilizer formulated for tomatoes, which is usually higher in phosphorus and potassium to encourage fruiting.
Follow the label directions for the amount — too much fertilizer causes excessive foliage and fewer fruits. If leaves turn yellow, the plant may need nitrogen. If fruit is slow to ripen or small, the plant may need phosphorus or potassium. A soil test from your local extension office can tell you exactly what your soil is missing, but regular feeding usually prevents deficiencies.
Remove diseased leaves and watch for common problems
Tomato plants are prone to fungal diseases like early blight (brown spots with rings on lower leaves) and late blight (water-soaked spots on leaves and fruit). The moment you see yellowing, brown spots, or soft spots, remove the affected leaf or branch and throw it in the trash — do not compost it. Sterilize your pruning shears with rubbing alcohol between cuts so you do not spread disease from plant to plant.
Improve air circulation by removing lower leaves (the bottom 6 to 12 inches) once the plant is established, which also reduces soil splash that spreads disease. Water only at the base, never on the leaves. If disease spreads despite these steps, a fungicide labeled for tomatoes may help — your local extension office can recommend one for your area. Powdery mildew and spider mites are less common but appear as white coating or tiny yellow spots; both respond to neem oil or sulfur spray.
Harvest fruit when it reaches full color
Tomatoes continue to ripen after you pick them, so you do not have to wait for perfect color on the vine. Pick fruit when it is mostly colored (even if still slightly green at the shoulders) if you want to eat it in a few days, or wait for full color if you want maximum flavor. Ripe fruit comes off the vine with a gentle twist; if you have to pull hard, it is not quite ready.
Once you pick a tomato, store it at room temperature — refrigeration stops the ripening process and makes the flesh mealy. Use ripe tomatoes within a few days. If frost is forecast and you have green fruit still on the vine, pick all of it and ripen it indoors in a paper bag or on a windowsill. Tomatoes ripen fastest at 68 to 77 degrees Fahrenheit.
Prune the top of the plant in late summer
In late August or early September (depending on your first frost date), pinch off the top 4 to 6 inches of the main stem. This stops the plant from putting energy into new growth and flowers that will not have time to ripen before frost. The plant will focus instead on ripening the fruit already developing. This step is optional but makes a real difference in how much ripe fruit you harvest before the season ends.
You can also remove any flowers that appear after this point, since they will not mature in time. Leave the fruit on the vine as long as possible — even a few extra days of warmth ripens it further.
Frequently Asked Questions
Why are my tomato leaves turning yellow?
Lower leaves yellow naturally as the plant matures and should be removed. If upper leaves yellow, the plant likely needs nitrogen — feed it with a balanced fertilizer. If yellowing starts at the edges and moves inward, or if the plant wilts despite wet soil, the roots may be diseased or waterlogged. Check soil moisture and improve drainage if needed.
What causes blossom end rot (dark soft spots on the bottom of the fruit)?
Blossom end rot is caused by inconsistent watering, usually a dry spell followed by heavy rain or watering. The plant cannot move calcium to the developing fruit fast enough. Keep soil moisture steady and mulch around the plant to buffer moisture swings. Remove affected fruit and improve watering habits going forward.
Can I grow tomatoes in a pot?
Yes. Use a pot at least 5 gallons for determinate varieties and 10 gallons for indeterminate types. Fill it with potting soil (not garden soil), water more often since pots dry out faster, and feed every two weeks since water drains nutrients away. Pots need drainage holes and should sit in a spot with at least six hours of direct sun daily.
How do I know when to stop watering before frost?
You do not need to stop watering until the plant dies back from frost. Keep watering consistently right up until the freeze. Once frost kills the plant, pick all remaining fruit (ripe and green) and let it ripen indoors.
Should I remove all the leaves to help fruit ripen faster?
No. Leaves feed the plant and ripen the fruit through photosynthesis. Remove only diseased or damaged leaves and the lowest 6 to 12 inches once the plant is established. Stripping too many leaves stresses the plant and actually slows ripening.