Prune suckers and lower branches to direct energy into fruit
A tomato plant puts energy into three things: roots, leaves, and fruit. The more leaves you remove without killing the plant, the more energy flows to tomatoes instead of new growth. Suckers are shoots that grow in the angle between the main stem and a branch—they produce leaves and flowers but rarely fruit. Pinching them off when they are small (under 2 inches) redirects that energy downward into existing fruit clusters.
Remove the lowest 6 to 8 inches of branches once the plant is 12 inches tall. These lower leaves sit in shade, stay wet longer after rain or watering, and draw energy away from the canopy where fruit actually ripens. Prune gradually over two weeks rather than all at once; removing too much at one time stresses the plant and can reduce yield.
Determinate varieties (bush types that fruit all at once) need less pruning than indeterminate varieties (vining types that fruit all season). If you have an indeterminate plant, continue removing suckers and lower leaves throughout the growing season. Stop pruning about four weeks before your first expected frost so the plant can focus on ripening remaining fruit rather than healing wounds.
Key Takeaways
- Pinch off suckers (shoots between the main stem and branches) when they are small to redirect energy from leaf growth into fruit production.
- Remove the lowest 6 to 8 inches of branches once the plant reaches 12 inches tall to improve air flow and reduce disease pressure on developing fruit.
- Water deeply and consistently—tomatoes need 1 to 2 inches per week, and uneven watering causes blossom end rot and fruit cracking.
- Feed with a balanced fertilizer every two to three weeks once flowers appear, or use a slow-release fertilizer at planting time.
- Indeterminate (vining) tomatoes produce more fruit over a longer season than determinate (bush) varieties, so choose the type that matches your space and goals.
Water deeply and evenly to prevent fruit loss
Inconsistent watering is the single biggest reason tomato plants drop flowers and produce fewer fruit. When soil dries out between waterings, the plant shuts down flower production to conserve water. When you then water heavily, the fruit absorbs water unevenly and cracks or develops blossom end rot (a dark, sunken spot on the bottom of the fruit).
Water at the soil level, not on the leaves, and water deeply enough that moisture reaches 6 to 8 inches down where the roots are. A soaker hose or drip line is more reliable than overhead watering because it delivers water consistently and keeps foliage dry. Most tomato plants need 1 to 2 inches of water per week depending on heat and rainfall. In hot weather, this may mean watering every two to three days.
Mulch around the base with 2 to 3 inches of straw or shredded leaves to keep soil temperature steady and reduce water loss to evaporation. Avoid piling mulch against the stem, which can trap moisture and cause rot.
Feed regularly once flowers appear
A tomato plant needs nitrogen to build leaves early in the season, but too much nitrogen late in the season pushes leaf growth at the expense of fruit. Once flowers appear, switch to a fertilizer lower in nitrogen and higher in phosphorus and potassium—these nutrients support flowering and fruit development.
A balanced fertilizer like 5-10-10 or 10-10-10 applied every two to three weeks works well for most gardeners. If you used a slow-release fertilizer at planting time (one that breaks down over three to four months), you may not need to feed again until mid-season. Liquid fertilizers work faster but need to be applied more often. Granular fertilizers release slowly and need fewer applications.
Stop feeding about four weeks before your first expected frost. Late feeding encourages new growth that will not have time to mature before cold weather arrives.
Choose indeterminate varieties for a longer harvest
Determinate tomatoes (bush types) grow to a set size, flower all at once, and produce most of their fruit within a four-week window. Indeterminate tomatoes (vining types) grow continuously, flower and fruit throughout the season until frost, and can produce two to three times as much fruit per plant over the same growing season.
Common indeterminate varieties include 'Brandywine', 'Cherokee Purple', 'Sungold', and 'Early Girl'. Common determinate varieties include 'Roma', 'San Marzano', and 'Mountain Magic'. Seed packets and plant labels always state which type you are buying. If you want maximum fruit from a single plant, indeterminate is the better choice—but it also requires more pruning and staking to stay manageable.
Stake or cage plants early to keep fruit off the ground
Fruit that rests on wet soil rots faster and attracts slugs and other pests. Staking or caging also improves air flow around the plant, which reduces fungal disease. Install support when you plant, not later, so you do not damage roots.
A cage should be at least 5 feet tall for indeterminate varieties; most store-bought cages are too short and collapse under the weight of fruit. A single stake (6 to 8 feet tall) with soft ties works well for indeterminate plants if you are willing to prune and train them. Determinate plants usually do fine in a shorter cage or with a single stake.
Improve pollination by attracting bees
Tomato flowers are self-fertile and can pollinate themselves, but bees and other insects shake the flowers and move pollen more effectively. More pollen transfer means more fruit set. Plant flowers nearby—marigolds, zinnias, and borage all attract pollinators and are straightforward to grow in a vegetable garden.
Avoid spraying insecticides when flowers are open, as this kills the bees doing the pollination work. If you are hand-pollinating (tapping flowers with a small brush or vibrating the stem), do this in the morning when pollen is driest.
Harvest fruit at the right stage to encourage more blooms
Leaving ripe fruit on the plant signals to the plant that reproduction is complete, which slows new flower production. Picking tomatoes as soon as they reach full color (even if they are still slightly firm) tells the plant to keep flowering and setting new fruit. Tomatoes continue to ripen off the vine at room temperature, so this does not sacrifice flavor.
Indeterminate plants especially respond to regular harvesting by producing more flowers. If you leave fruit on the vine to fully soften, the plant will slow down new flower production and you will get fewer total tomatoes by season's end.
Frequently Asked Questions
What is the difference between a sucker and a branch I should keep?
A sucker grows in the angle (called the axil) between the main stem and a branch. A branch grows directly from the main stem. Suckers rarely produce fruit and use energy that could go to existing fruit clusters. Branches produce flowers and fruit, so keep them.
Can I use tomato fertilizer instead of a general-purpose fertilizer?
Yes. Tomato fertilizers are formulated specifically for the nutrient ratio tomatoes need at different growth stages. They work well and take the guesswork out of feeding. Follow the label instructions for timing and amount.
Will pruning reduce my total harvest?
Light pruning (removing suckers and lower leaves) increases yield by directing energy into fruit. Heavy pruning can reduce yield because you are removing too many leaves that power fruit production. Remove only 10 to 15 percent of the plant's foliage at any one time.
How do I know when to stop watering in fall?
Water normally until about four weeks before your first expected frost. After that, reduce watering gradually to slow new growth and let the plant focus on ripening remaining fruit. Stop watering once frost arrives and the plant dies back.
Do I need to remove all the suckers, or just some?
Remove all suckers on indeterminate plants if you want maximum fruit production. On determinate plants, you can leave some suckers since the plant only fruits once anyway. Experiment: leave suckers on half the plant one year and remove them from the other half to see which gives you more fruit in your garden.