Start with the right variety and location for your climate
The single biggest factor in growing productive tomato plants is matching the variety to where you live and how much sun you have. Determinate varieties (bush types) grow to a fixed size and produce most of their fruit at once—good for canning or if you have limited space. Indeterminate varieties (vining types) keep growing and producing fruit all season, which means more tomatoes over time but they need staking or caging and more space.
Tomatoes need at least six to eight hours of direct sunlight daily; eight to ten hours is better. Less sun means slower growth, fewer flowers, and less fruit. Before you plant, observe your garden through the day and mark the spots that get the most unbroken sun. If you live in a very hot climate (above 90°F regularly), afternoon shade can actually help prevent sunscald and keep plants from shutting down in peak heat.
Check your USDA hardiness zone and choose varieties bred for your region. A tomato variety that thrives in cool-summer zones will struggle in the South, and vice versa. Seed catalogs and plant tags list the days to maturity—count backward from your first frost date to make sure the variety has time to produce before cold arrives.
Key Takeaways
- Plant tomatoes in soil that drains well, has been mixed with compost, and sits in at least six to eight hours of direct sun each day.
- Water deeply and consistently—about one to two inches per week depending on heat and rainfall—and water the soil, not the leaves, to prevent disease.
- Prune suckers (shoots that grow between the main stem and branches) on indeterminate varieties to direct energy into fruit instead of foliage.
- Support plants with cages or stakes from the moment you plant them, because waiting until they fall over damages roots and fruit.
- Fertilize every two to three weeks once flowers appear, using a formula higher in phosphorus and potassium than nitrogen to encourage fruiting.
Prepare soil that holds moisture but drains fast
Tomatoes are heavy feeders and need rich, well-draining soil. Before planting, work compost or aged manure into the top eight to twelve inches of soil—aim for about one-third compost by volume. This improves drainage in clay soil and water-holding capacity in sandy soil. If you are planting in containers, use a potting mix labeled for vegetables, not garden soil, which compacts in pots.
Soil pH should be between 6.0 and 6.8. If you have never tested your soil, do it now—most county extension offices offer inexpensive testing, or you can buy a kit at a garden center. Soil that is too acidic or alkaline locks up nutrients even if they are present. A straightforward test takes the guesswork out of fertilizing later.
At planting time, bury the stem deeper than it was growing in the pot—up to the first true leaves. Tomatoes will grow roots all along the buried stem, creating a stronger root system. This is one of the few times you should plant deeper than the original depth.
Water deeply and consistently, targeting the soil
Inconsistent watering is the reason most home gardeners end up with cracked fruit, blossom-end rot (dark sunken spots on the bottom of the fruit), or plants that drop flowers before they set fruit. Tomatoes need about one to two inches of water per week, including rain. In hot weather or sandy soil, you may need to water twice a week. In cool weather or clay soil, once a week may be enough.
Water early in the morning and water the soil directly at the base of the plant—never wet the leaves. Wet foliage invites fungal diseases like early blight and late blight, which spread fast and can kill a plant in days. A soaker hose or drip line delivers water exactly where it is needed and reduces disease pressure. If you must use a sprinkler, water very early so leaves dry quickly.
Stick your finger two inches into the soil. If it feels dry, water. If it feels moist, wait. This straightforward check beats any watering schedule because weather changes week to week. During fruit-set (when flowers are turning into tomatoes), consistent moisture is critical—erratic watering at this stage causes the problems listed above.
Support plants from planting day, not after they fall
Install a cage or stake the moment you plant, before the root system spreads. Waiting until the plant is large and falling over means you will damage roots trying to drive a stake in, and you risk breaking branches. For indeterminate varieties, a sturdy cage at least five feet tall or a seven-foot stake works best. For determinate varieties, a smaller cage or four-foot stake is usually enough.
Tie the main stem loosely to the support with soft ties—old cloth strips, garden twine, or commercial plant ties work well. Tie in a figure-eight pattern (loop around the support, then around the stem) so the tie does not cut into the stem as it grows. Check ties every two weeks and loosen them as the stem thickens.
As indeterminate plants grow, keep tying new growth to the support. This keeps fruit off the ground where it can rot or get eaten by slugs, improves air circulation, and makes harvesting easier. Determinate varieties need less tying because they stop growing at a set height.
Prune suckers on indeterminate varieties to focus energy on fruit
Indeterminate tomatoes grow suckers—shoots that sprout in the angle between the main stem and a branch. Left alone, these become full branches with their own flowers and fruit, which sounds good but actually divides the plant's energy. Removing suckers forces the plant to put more resources into the fruit already set, making individual tomatoes larger and the plant more productive overall.
Pinch off suckers when they are small—two to four inches long—by hand or with pruning shears. Do this every week or two during the growing season. You do not need to remove every single one, but removing the largest ones makes a real difference. Stop pruning about four weeks before your first frost date so the plant can focus on ripening the fruit already on it rather than making new flowers.
Determinate varieties do not need sucker pruning because they naturally stop growing at a set size. Pruning them actually reduces your harvest because you are removing branches that would have produced fruit.
Fertilize regularly once flowers appear
Tomatoes planted in compost-rich soil do not need fertilizer right away, but once flowers appear, they need regular feeding. Use a balanced fertilizer (like 5-10-10) or one slightly higher in phosphorus and potassium than nitrogen. Too much nitrogen pushes leafy growth at the expense of flowers and fruit. Fertilize every two to three weeks once flowering starts, following the package directions for your plant size.
Liquid fertilizers work fastest and are straightforward to explore with a watering can. Granular fertilizers release slowly and need less frequent process. Compost tea (steeped compost in water) is a gentler option if you prefer organic methods. Whichever you choose, water the plant well before fertilizing so you do not burn the roots with concentrated fertilizer on dry soil.
If leaves turn yellow or pale, the plant may need nitrogen. If flowers drop without setting fruit, the plant may be stressed by heat, inconsistent watering, or too much nitrogen. Adjust watering first—that solves most problems—before adding more fertilizer.
Harvest ripe fruit and handle green fruit before frost
Pick tomatoes when they are fully colored but still slightly soft to the touch. They will continue to ripen off the vine, and picking at this stage encourages the plant to keep flowering and setting new fruit. If you wait until they are soft on the plant, you are slowing down new production.
About four weeks before your first frost date, stop fertilizing and reduce watering slightly. This signals the plant to focus on ripening fruit rather than making new flowers. Two weeks before frost, pinch off all remaining flowers and any small fruit that will not have time to mature. This redirects energy to the fruit that will actually ripen.
When frost is one week away, pick all remaining tomatoes—ripe, turning, and even green ones. Green tomatoes will ripen indoors in a warm spot (around 70°F) over one to three weeks. Place them in a paper bag with a ripe banana or apple, which releases ethylene gas and speeds ripening. Do not refrigerate green tomatoes; cold stops the ripening process.
Frequently Asked Questions
Why are my tomato flowers dropping without making fruit?
Flowers drop when plants are stressed by heat above 90°F at night, inconsistent watering, or too much nitrogen fertilizer. Check your watering first—soil should stay consistently moist but not waterlogged. In extreme heat, afternoon shade cloth can help. If you recently fertilized heavily, hold off and let the plant recover.
What is the white powder on my tomato leaves?
That is likely powdery mildew, a fungal disease that thrives in warm, dry conditions. Remove affected leaves, improve air circulation by pruning lower branches, and water only the soil, not the leaves. Spray with sulfur or neem oil if it spreads. It rarely kills the plant but can reduce fruit production if left unchecked.
Can I grow tomatoes in containers?
Yes. Use a pot at least five gallons for determinate varieties and ten gallons for indeterminate varieties, filled with potting mix. Containers dry out faster than garden soil, so check moisture daily and water more often. Containers also warm up faster in spring, which can actually speed growth in cool climates. Support and fertilize the same way as in-ground plants.
How do I know when a tomato is ripe?
A ripe tomato is fully colored (red, pink, yellow, or whatever color the variety is) and yields slightly to gentle pressure. It should smell fragrant at the stem end. Pick it when it reaches full color but is still slightly firm—it will soften over the next day or two and taste better than one left on the vine until it is very soft.
Should I remove leaves from my tomato plant?
Remove only the lowest leaves (the first six to twelve inches from the ground) once the plant is established. These leaves are most likely to get soil-borne diseases. Remove any leaves that show spots, yellowing, or signs of disease. Do not strip the plant bare—leaves feed the fruit. Prune on a dry day to reduce disease spread.