Prune suckers and lower branches to direct energy to fruit

Tomato plants spend energy on three things: roots, stems and leaves, and fruit. The more you remove unnecessary growth, the more the plant can put into the tomatoes you actually want to harvest. Suckers are the shoots that grow in the V-shaped crease between the main stem and a branch — they produce leaves and flowers but rarely fruit, and they steal nutrients from the branches that do.

Remove suckers when they are small, before they woody and hard to snap off. On indeterminate varieties (the ones that keep growing all season), pinch them off with your fingers once a week. On determinate varieties (the bushy types that stop growing at a set height), you can be less aggressive — remove only the largest ones. Also remove the lowest 6 to 8 inches of branches once the plant is established; these leaves sit in shade and humidity, which invites disease and produces almost no fruit.

Stop feeding nitrogen once flowering starts

Nitrogen makes plants grow tall and leafy. If you keep feeding it after the plant flowers, you get a massive green bush with few tomatoes. Switch to a fertilizer higher in phosphorus and potassium once you see the first flowers — these nutrients push the plant to make fruit instead of leaves.

If you are using a balanced fertilizer like 10-10-10, stop using it. Move to something like 5-10-10 or 5-20-20, or use a tomato-specific formula. If you added compost or manure at planting time, you may not need to fertilize at all — test by watching the plant's growth rate. If it is still growing vigorously and producing flowers, hold off on feeding.

Water deeply and consistently, not daily

Inconsistent watering causes blossom end rot (a dark sunken spot on the bottom of the fruit) and cracks in ripe tomatoes. The plant needs steady moisture, not wet-then-dry cycles. Water deeply once or twice a week so the soil stays moist 6 to 8 inches down, rather than sprinkling every day.

Water at the soil level, not on the leaves — wet foliage invites fungal disease. In hot weather, you may need to water twice a week. In cool or rainy weather, skip a week. The goal is soil that feels like a wrung-out sponge: moist but not soggy. Mulch around the base with 2 to 3 inches of straw or wood chips to keep moisture even and reduce how often you need to water.

Provide at least 6 to 8 hours of direct sun daily

Tomatoes need light to make sugar, and sugar is what makes fruit. A plant in partial shade will flower, but the fruit stays small and ripens slowly. If your plant gets less than 6 hours of direct sun, move it to a sunnier spot or prune nearby plants that are shading it.

In very hot climates (above 90°F regularly), afternoon shade can actually help — it prevents the pollen from becoming sterile, which stops fruit set. But in most climates, more sun means more tomatoes. If you are growing in containers, you can move them to follow the sun through the day.

Thin fruit clusters to let remaining tomatoes grow larger

A tomato plant can set more fruit than it can ripen to full size. If a cluster has 5 or 6 small tomatoes, remove the smallest 1 or 2 when they are marble-sized. This sounds counterintuitive — you are throwing away tomatoes — but the remaining ones grow faster and ripen sooner. You end up with fewer but larger, sweeter tomatoes instead of many small, slow-ripening ones.

This matters most in short-season climates where you need fruit to ripen before frost. In long-season areas, you can leave more fruit on the vine. Pinch off the smallest tomato in each cluster with your fingers or use pruning shears if the stem is woody.

Pollinate flowers by hand if bees are scarce

Tomato flowers are self-fertile — they have both male and female parts — but they still need to be shaken to release pollen. Bees do this naturally, but if you have few bees in your garden, you can do it yourself. Use an electric toothbrush held against the flower stem, or tap the stem gently with your finger while the flower is open.

Do this in the morning when pollen is driest, and do it every 2 to 3 days while the plant is flowering. You will see the flower drop its petals a day or two later if pollination worked. This is especially useful in cool weather (below 60°F at night), when bees are less active and pollen is less viable.

Remove leaves and branches once fruit is set to speed ripening

Once the plant has set most of its fruit for the season, you can prune more aggressively to let light reach the developing tomatoes. Remove leaves that shade the fruit, working from the bottom up. Stop pruning 4 to 6 weeks before your first expected frost — the plant needs leaves to keep feeding the fruit as it ripens.

In late summer, you can also pinch off new flower clusters that appear after mid-August (or your region's equivalent). These flowers will not have time to ripen before cold weather, so removing them lets the plant focus on the fruit already on the vine.

Key Takeaways

  • Remove suckers and lower branches so the plant puts energy into fruit instead of unnecessary leaves and stems.
  • Switch from nitrogen-heavy fertilizer to phosphorus and potassium once the plant starts flowering, or stop fertilizing if you added compost at planting.
  • Water deeply and consistently at soil level rather than sprinkling daily, and mulch to keep moisture even.
  • Provide at least 6 to 8 hours of direct sun, and thin fruit clusters when tomatoes are small so the remaining ones grow larger and ripen faster.
  • Hand-pollinate flowers by tapping the stem in the morning if bees are scarce, and prune aggressively once fruit is set to let light reach the developing tomatoes.

Frequently Asked Questions

How many tomatoes should I leave on each branch?

Leave 3 to 5 tomatoes per cluster and space clusters 12 to 18 inches apart on the main stem. This gives each fruit room to grow and air to circulate. If you want very large tomatoes, thin to 2 or 3 per cluster. If you want many medium tomatoes, leave 4 to 5.

Can I use tomato cages instead of stakes?

Yes, but cages work best for determinate (bushy) varieties. Indeterminate varieties grow taller than most cages and will sprawl over the top. Use a tall cage (at least 5 feet) or switch to stakes and string for indeterminate plants. Either way, support matters because heavy fruit-laden branches can snap.

What temperature stops tomato pollen from working?

Pollen becomes sterile when nighttime temperatures drop below 55°F or daytime temperatures stay above 90°F. If your region has cool nights, wait until soil and air warm up before planting. If you have hot summers, choose heat-tolerant varieties and provide afternoon shade when temperatures regularly exceed 90°F.

Should I remove all the leaves to get more sun on the fruit?

No. Leaves make the sugar that ripens the fruit. Remove only the leaves that directly shade developing tomatoes, and stop pruning 4 to 6 weeks before your first frost so the plant can keep feeding the remaining fruit. Over-pruning weakens the plant and slows ripening.

When should I stop fertilizing?

Stop fertilizing once the plant is flowering heavily and fruit is setting. If you keep feeding nitrogen, the plant will keep making leaves instead of ripening fruit. If the plant looks pale or growth slows, you can give it one more dose of phosphorus-heavy fertilizer, but then stop.