How to Prune Tomatoes (and When Not To)

GardenDraft Team · May 18, 2026 · 6 min read

Part of: Plant Problems & Pest Guides

Pruning tomatoes is one of those jobs that sounds fussy and takes thirty seconds a week. Done right, it gives you a healthier plant, earlier ripening, and fewer disease problems. Done to the wrong type of tomato, it costs you fruit. So the first question isn't how to prune. It's whether to.

Determinate: leave it alone

Determinate ("bush") tomatoes grow to a fixed size and set nearly all their fruit at once, on a predetermined number of branches. Prune them and you simply remove fruit you'd have harvested. Beyond stripping the lowest leaves off the soil, leave determinate plants unpruned. If you're not sure which type you have, the tomato catalog page and the seed packet will tell you, and the distinction is laid out in how to grow tomatoes.

Indeterminate tomatoes: where pruning pays

Indeterminate ("vining") tomatoes grow and fruit endlessly until frost, and left alone they become a dense, sprawling thicket. Pruning them to one or two main stems concentrates energy into fruit instead of foliage, opens the plant to sun and air, and makes a staked plant manageable. This is the type worth pruning.

Know a sucker when you see one

The whole technique comes down to one structure. A sucker is the new shoot that sprouts in the crotch (the 45-degree angle) between the main stem and a leaf branch. Left to grow, each sucker becomes a whole new stem with its own suckers, which is how one plant turns into a jungle. To keep a single-stem plant, pinch out every sucker; for a two-stem plant, let the one sucker just below the first flower cluster grow into a second leader and remove the rest.

How and when

• Pinch small, pinch often. Remove suckers while they're a couple of inches long; just bend them sideways and they snap off cleanly with no tool and a wound that heals fast. A weekly walk down the row keeps it effortless.
• Strip the bottom leaves. Clear the lowest 6–12 inches of foliage as the plant grows. Those leaves are the first to catch soil-splashed disease like early blight and contribute little.
• Don't overdo it. Leaves feed the plant and shade the fruit; a plant pruned bare gets sunscalded fruit. Open it up, don't strip it.
• Top it near season's end. A few weeks before your first frost, cut off the growing tips. The plant stops making new flowers that won't have time to ripen and pours its remaining energy into finishing the fruit already on the vine.

Keep it clean

Disease moves on hands and blades, so prune when plants are dry, and if you've handled a sick-looking plant, wash up before touching healthy ones. Pruning pairs naturally with staking and support: a single-stem plant is easy to tie to a stake, and the two jobs together make for the healthiest tomatoes in the garden. Time everything to your location with the planting calendar.