Water deeply and regularly, but let the soil dry between waterings
Tomato plants need consistent moisture, but not soggy soil. Water at the base of the plant — not the leaves — once or twice a week depending on heat and rainfall. Stick your finger two inches into the soil; if it feels dry, water. If it still feels wet, wait another day or two.
In hot weather, daily watering may be necessary. In cool weather or after rain, you may skip a day. The goal is soil that stays moist but drains well. Wet leaves invite disease, so always water the ground around the plant, not the foliage itself.
Key Takeaways
- Water at the base of the plant once or twice weekly, checking soil moisture with your finger before watering again.
- Place your tomato plant where it gets at least six to eight hours of direct sunlight each day.
- Support the plant with a cage or stake early, before it grows tall and heavy with fruit.
- Pinch off the bottom leaves once the plant is established to reduce disease and improve air flow.
- Pick ripe tomatoes regularly to encourage the plant to keep producing fruit throughout the season.
Give your plant six to eight hours of direct sun daily
Tomatoes are sun-hungry plants. They need at least six hours of direct sunlight to produce sweet, flavorful fruit. Eight hours or more is even better. If your plant sits in shade for part of the day, it will grow slowly and produce fewer tomatoes.
If you are growing in a container, you can move it to follow the sun. If it is planted in the ground, choose a spot that gets morning sun — this also helps dry the leaves and reduce fungal disease. Avoid planting near walls or trees that block light in the afternoon.
Support the plant with a cage or stake before it gets heavy
Tomato plants grow tall and heavy once fruit appears. Install a support system early — when the plant is still young and small — rather than waiting until it flops over. A tomato cage (the wire cylinder kind) works well for determinate varieties that stay compact. A stake (a wooden or metal rod driven into the ground) works better for indeterminate varieties that grow tall all season.
Tie the main stem loosely to the stake with soft string or cloth strips, leaving room for the stem to grow thicker. Check the ties every two weeks and loosen them if they are cutting into the plant. A plant that falls over can break branches and expose fruit to disease and pests.
Prune lower leaves and remove suckers to improve air flow
Once your tomato plant is about two feet tall and producing flowers, pinch off the lowest leaves — the ones touching or near the soil. These leaves are most likely to develop fungal disease like early blight. Removing them improves air circulation around the base of the plant and reduces moisture buildup.
On indeterminate varieties (the tall ones that grow all season), you can also remove suckers — the small shoots that grow in the angle between the main stem and a branch. Removing suckers directs the plant's energy into fruit rather than extra foliage. On determinate varieties (the compact bush types), leave the suckers alone; they produce fruit.
Fertilize every two to three weeks once flowers appear
Tomato plants need nutrients to produce fruit. Use 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 flowering and fruiting. Follow the label instructions for how much to use.
Start fertilizing once the plant has flowers, not before. Over-fertilizing early in the season produces lots of leaves but few tomatoes. A light feeding every two to three weeks during the growing season is better than one heavy dose. If you planted in rich soil, you may need less fertilizer than the label suggests.
Watch for common pests and diseases
Tomato plants attract hornworms (large green caterpillars), whiteflies, and spider mites. Check the undersides of leaves weekly for insects or sticky residue. If you spot pests, spray the plant with water to knock them off, or use insecticidal soap if the problem is severe.
Fungal diseases like early blight (brown spots on lower leaves) and powdery mildew (white coating on leaves) are common in humid conditions. Remove affected leaves when ready, water only at the base, and improve air flow by pruning. If disease spreads, a fungicide labeled for tomatoes may help, but prevention through good air circulation is more effective than treatment.
Harvest ripe tomatoes regularly to keep the plant producing
Pick tomatoes when they are fully colored but still slightly soft to the touch. A ripe tomato comes off the vine with a gentle twist. Harvesting regularly signals the plant to keep flowering and setting new fruit. If you leave ripe tomatoes on the vine too long, the plant slows production.
If frost is coming and you have green tomatoes still on the plant, pick them and ripen them indoors on a windowsill or in a paper bag with a ripe banana or apple. The ethylene gas from the fruit speeds ripening. You can also leave the entire plant in a cool garage or basement and pick tomatoes as they ripen over the next few weeks.
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 ones. Fill it with potting soil (not garden soil), water more often because pots dry faster, and place it where it gets six to eight hours of sun. Container tomatoes need the same support, pruning, and fertilizing as ground-planted ones.
Why are my tomatoes splitting or cracking?
Splitting happens when the plant gets too much water too fast, usually after a dry spell followed by heavy rain or overwatering. Keep soil moisture steady rather than letting it swing between wet and dry. Mulch around the base to help soil retain moisture evenly, and water deeply but less frequently rather than shallow daily watering.
What does blossom end rot look like?
Blossom end rot appears as a dark, sunken spot on the bottom of the tomato. It is caused by calcium deficiency, usually from inconsistent watering. Keep soil moisture steady, mulch to regulate moisture, and avoid over-fertilizing with nitrogen, which can interfere with calcium uptake. Affected tomatoes cannot be saved, but consistent watering prevents it on new fruit.
When should I stop fertilizing?
Stop fertilizing about four weeks before your first expected frost. Late-season fertilizing pushes new growth that will not have time to mature and can delay ripening of existing fruit. Focus on harvesting what you have rather than encouraging new flowers and fruit.
How long does a tomato plant produce fruit?
Determinate varieties produce most of their fruit over four to six weeks, then slow down. Indeterminate varieties keep flowering and producing until frost kills them, often from mid-summer through fall. Consistent harvesting, pruning, and fertilizing extend the productive season for indeterminate types.