How to Prune Tomatoes
Strategic pruning means bigger fruit, healthier plants, and easier harvests
Know Your Tomato Type First!
Indeterminate (Vining)
Grow all season, need heavy pruning. Remove suckers to 1-2 main stems.
Determinate (Bush)
Set size, minimal pruning. Only remove suckers below first flower cluster.
How to Remove Suckers
Identify the Sucker
Look in the 'V' between the main stem and a branch. The new shoot growing there is a sucker. They appear small but grow into full branches.
Pinch When Small
Suckers under 2 inches can be pinched off with fingers. Grasp the sucker at its base and bend until it snaps. Best done in morning when plants are turgid.
Cut Larger Suckers
For suckers over 2 inches, use clean pruners to cut. Leave a small stub (1/4") rather than cutting flush - this heals better.
Check Weekly
Suckers grow fast! Check plants weekly and remove new suckers while small. Consistent pruning is easier than dealing with overgrown plants.
Other Tomato Pruning Tasks
Remove Lower Leaves
Remove leaves below the first fruit cluster. This improves airflow and prevents soil-borne diseases from splashing onto leaves.
Remove Yellow Leaves
Yellow or diseased leaves should be removed and disposed of (not composted). This slows disease spread.
Topping Late Season
4-6 weeks before first frost, cut off the growing tip of each stem. This directs energy to ripening existing fruit.
Thin Dense Foliage
Remove interior leaves blocking airflow. Good circulation prevents fungal diseases like blight.
Frequently Asked Questions
What are tomato suckers?
Suckers are shoots that grow in the 'armpit' between the main stem and a branch. Left alone, they become full branches that compete for energy. Removing them directs energy to fruit production.
Should I prune determinate or indeterminate tomatoes?
Indeterminate (vining) tomatoes benefit most from pruning - remove suckers to focus energy on fruit. Determinate (bush) tomatoes need minimal pruning; removing suckers reduces yield since they have a set number of fruit.
When should I stop pruning tomato plants?
Stop heavy pruning when plants start setting fruit. Late in the season (4-6 weeks before frost), 'top' the plant by removing the growing tip to direct all energy to ripening existing fruit.
Can you prune tomatoes too much?
Yes! Over-pruning removes too many leaves, causing sunscald on fruit and reducing photosynthesis. Keep enough foliage to shade fruit. A good rule: maintain 18-24 inches of foliage above each fruit cluster.