When To Pick Potato Plants

You pick potato plants when the foliage has died back and the skins are set, signaling the tubers are mature.

Timing matters more than most gardeners realize, and picking too early or too late can seriously affect how your harvest stores and tastes.

The real question of when to pick potato plants isn’t just about the calendar, it’s about reading the signals your plant gives you and knowing what kind of potato you want to eat.

In this post, we’ll break down the perfect timing for picking potato plants, how to test if they’re ready, and what happens if you wait too long.

Let’s dig in.

When to Pick Potato Plants Based On Growth Stage

When to pick potato plants depends heavily on whether you’re after new potatoes or mature storage spuds.

New potatoes are young, thin-skinned tubers that you harvest before the plant fully matures.

For these, you can start picking potato plants about two to three weeks after the plants finish flowering.

The flowers are your first clue that tubers have formed underground.

If you gently feel around the base of the plant, you’ll find small, tender potatoes with peels that easily rub off.

These are perfect for immediate eating because they don’t store well.

Mature potatoes, on the other hand, require you to wait until the entire plant has died back naturally.

That’s when the skins have thickened enough for long-term storage.

Signs the Plant Is Ready for Main Harvest

The main harvest is when you pick potato plants for storage, and the key sign is yellowing, then browning, then collapsing foliage.

Once the tops have completely died back, the potatoes are telling you they’ve finished growing.

You should also check the soil moisture because potatoes left in wet ground too long can rot.

The best time to pick potato plants is on a dry day after the foliage has been dead for about two weeks.

That waiting period lets the skins set and cure slightly in the ground.

How Weather Affects When to Pick Potato Plants

Weather plays a huge role in when to pick potato plants.

If you get an early frost, it will kill the foliage fast, sending the plant into dormancy.

Don’t panic though, as those tubers are still fine and can be harvested once the ground thaws.

If you have a warm, wet autumn, the plant might keep growing longer, delaying your harvest.

You can speed things up by cutting the foliage down about two weeks before you intend to dig.

This triggers the skins to thicken, which is a classic trick to control when to pick potato plants.

How to Test Potatoes Before You Dig Them Up

Testing is the surefire way to know if it’s time to pick potato plants from your garden.

You don’t want to guess and lose your crop.

The Skin Set Test

The skin set test tells you if the potatoes are mature enough for storage.

Gently dig around one plant and pull out a single potato.

Rub your thumb across the skin.

If the skin rubs off easily, the potato is too immature and needs more time.

If the skin stays intact and feels tough, that’s your green light to pick potato plants for the main harvest.

Immature skins mean the potato won’t store and will shrivel quickly.

The Foliage Check

Another simple test is to look at the foliage instead of digging.

When to pick potato plants becomes obvious when about 80% of the leaves have yellowed and flopped over.

If the stems are still green and upright, the plant is still photosynthesizing and building sugars.

Letting the plant finish its natural cycle maximizes the size and starch content of your tubers.

Common Mistakes With Picking Potato Plants Too Early or Late

Timing errors cost gardeners dearly, so let’s talk about what can go wrong.

Picking Too Early

If you pick potato plants too early, you’ll have small, watery tubers with paper-thin skins.

They might taste fine fresh, but they’ll bruise easily and rot within weeks.

Early harvesting also cuts your yield because the plant hasn’t channeled all its energy into the tubers yet.

Patience is key when deciding when to pick potato plants.

Picking Too Late

Waiting too long has its own set of problems.

If the ground stays warm and moist after the foliage dies, potatoes can start resprouting and become tough.

They can also be attacked by slugs and wireworms once the protective foliage is gone.

Hard frosts can damage tubers near the surface, making them rot in storage.

So the sweet spot for when to pick potato plants is right after the foliage dies but before the ground freezes hard.

Steps to Harvest and Cure for Maximum Shelf Life

Once you’ve decided it’s time to pick potato plants, how you dig and cure them is just as important as the timing.

Use a garden fork to loosen the soil gently, starting about a foot away from the plant’s base.

Dig up slowly to avoid spearing tubers, and never pull potatoes by their stems.

Shake off excess soil but don’t wash them because moisture invites rot.

Spread the potatoes in a single layer in a dark, cool, well-ventilated spot.

Let them cure for one to two weeks at about 50–60°F (10–15°C) and high humidity.

After curing, brush off any remaining dirt and store them in a cool, dark place.

Light exposure turns potatoes green and produces solanine, which is toxic, so keep them covered.

So, When Do You Pick Potato Plants?

You pick potato plants when the foliage has completely died back and the skins resist gentle rubbing.

For new potatoes, you pick potato plants earlier, just after flowering when the skins are thin.

For storage potatoes, it’s all about waiting two weeks after the tops die to let the skins set.

Watch the weather, test a single tuber, and always harvest on a dry day.

Getting the timing right on when to pick potato plants ensures you get the best flavor and the longest storage life.

Happy digging, and enjoy the fruits of your labor.