How to Prune Potato Plants

Solanum tuberosum

Reviewed by Kiersten Rankel M.S.

Quick Answer

Prune potato plants during the growing season by pinching off flowers and removing excess suckers that compete for energy. Focus pruning in early to mid-summer when plants are actively growing. Don't remove more than a quarter of the foliage at once, since the leaves fuel tuber development underground.

When is the best time to prune?

Potatoes are warm-season annuals that grow quickly from planting to harvest, so any pruning should happen during the active growing window before plants begin to die back naturally.

Pacific

May–Jul

Mountain

Jun–Aug

Midwest

Jun–Aug

Northeast

Jun–Aug

Southeast

Apr–Jun

Stay on top of plant care

Get seasonal reminders for watering and fertilizing — personalized for your plants.

Try Greg Free

Why Should I Prune My Potato Plants?

Most gardeners never think about pruning potatoes, but a little selective trimming can help your plants put more energy into tuber production. The main targets are flowers, excessive suckers, and any diseased foliage.

When potato plants flower, they're trying to set seed (those small green tomato-like fruits). Pinching flowers off redirects that energy into the tubers underground. Some varieties flower heavily and others barely at all, so this matters more for prolific bloomers.

If your potato plants are very bushy with lots of side shoots, thinning out a few of the weaker ones improves air circulation and reduces disease pressure, especially for late blight. Remove suckers that are growing from the base and competing with the main stems.

Don't go overboard. The leaves are the engine that drives tuber growth through photosynthesis. Removing too much foliage will give you smaller potatoes. The plant will naturally die back as the tubers mature, and that's your signal to stop any maintenance and prepare for harvest.

Know Before You Cut

Difficulty Easy

Max removal 1/4 of foliage at a time

Growth pattern Bushy annual

Tools Pruners or pinching by hand

What Should I Remove?

Pinch off flowers as they appear

Remove weak suckers at the base

Cut out any leaves with blight spots immediately

Thin crowded stems for better airflow

Don't remove more than 1/4 of foliage at once

Don't prune after plants start yellowing naturally

Don't cut the main stems

How Do I Prune Step by Step?

Pinch off flower buds

As soon as you see flower buds forming, pinch them off between your fingers. This is the simplest and highest-impact pruning you can do.

Identify weak or crowded stems

Look at the base of each plant. If more than 4–5 stems are growing from one seed potato, the weakest ones can be removed to reduce competition.

Remove suckers at the base

Pull or cut small side shoots growing from the base. Take only the thinnest ones and leave the strongest 3–4 stems per plant.

Remove diseased foliage promptly

Cut off any leaves showing brown or black spots immediately and dispose of them away from the garden. Don't compost them. This slows the spread of blight.

Stop pruning when plants yellow

When the foliage starts dying back on its own, the tubers are maturing. Leave the plant alone and wait 2–3 weeks after complete dieback before harvesting.

Got More Questions?

Do I really need to remove potato flowers?

It's optional but helpful. Removing flowers redirects a small amount of energy to tuber production. The difference is modest, but it's easy to do and has no downside.

Can I eat the small green fruits that form after flowering?

No. Those fruits contain solanine and are toxic. Remove them if you see them, especially if children or pets are around.

Should I cut potato plants back before harvest?

Some gardeners cut the foliage down a week or two before digging to toughen the skins. This is optional and mainly helps if you're storing the potatoes long-term.

My potato plants fell over. Should I prune them?

Falling over is common for tall varieties. Rather than pruning, hill more soil around the base for support. The stems will keep producing even if they're leaning.

What's the difference between hilling and pruning potatoes?

Hilling means mounding soil around the stems to cover developing tubers and encourage more to form. Pruning is removing above-ground growth. Both help, but hilling has a bigger impact on yield.

Stay on top of plant care

Get seasonal reminders for watering and fertilizing — personalized for your plants.

Try Greg Free

About This Article

Kiersten Rankel M.S.

Botanical Data Lead at Greg · Plant Scientist

About the Author

Kiersten Rankel holds an M.S. in Ecology & Evolutionary Biology from Tulane University. A certified Louisiana Master Naturalist, she has over a decade of experience in science communication, with research spanning corals, cypress trees, marsh grasses, and more. At Greg, she curates species data and verifies care recommendations against botanical research.

See Kiersten Rankel's full background on LinkedIn.

Editorial Process

Pruning guidance verified against Solanum tuberosum growth data from Greg's botanical database, cross-referenced with USDA hardiness zone data and published horticultural research.

1,549+ Greg users growing this plant

USDA hardiness zones 3a–10a

Citations:
NC State Extension
Missouri Botanical Garden
Royal Horticultural Society
USDA Plants Database

More about Potato

Annual Benefits Bugs Care Indoors Care Outdoors Companion Plants Direct Sunlight Flower Flower Problems Hardiness Zone How to Grow How to Plant Humidity Landscaping Ideas Black Spots on Leaves Brown Spots on Leaves Leaves Curling Leaves Drooping Leaves Dropping Leaves Falling Over Leaves Mushy Yellow Leaves Lifecycle Light Requirements Overview Perennial Pollination Problems Propagating Repotting Root Rot Roots Size Temperature Varieties How Often to Water Weeds What Eats When to Plant Where to Plant Wilting Winter

Grow plants with confidence