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Have you ever grabbed a bag of potatoes from the pantry and noticed little shoots popping out? It happens to just about everyone. Even when you store them carefully, potatoes eventually start sprouting. It’s just what they’re designed to do.

Sprouting is a natural part of a potato’s life cycle, especially when it’s kept in a warm or bright spot. Seeing those sprouts doesn’t automatically mean the potatoes are bad, but it does mean it’s time to take a closer look before using them.

So why do potatoes sprout in the first place? When are they still safe to eat, and when should they be tossed or used in another way? Let’s break it down simply and practically.

Why Does a Potato Sprout?

potato sprouting — Image Credit: Deposit Photos

When potatoes sprout, tiny areas of new growth appear at certain points on the surface of a potato. At first, these growths appear as tiny white, yellow, or pale green nodules. If left unchecked, they’ll grow into longer, more defined shoots with a slightly purplish or pinkish hue.

This happens because potatoes are tubers, plant structures that can sprout and grow into new plants. So, your sprouted potatoes are simply trying to continue their natural life cycle, even though they’re sitting in your pantry and not buried in the soil!

What does it mean when potatoes sprout?

potato sprouting pink — Image Credit: Deposit Photos

Sprouting is a natural process, but we normally halt it by storing potatoes to put them into dormancy. But sometimes, despite our best attempts, sprouted potatoes still occur. The good news is that these potatoes don’t necessarily need to be discarded, so don’t throw them in the trash just yet!

Is It Normal for Potatoes to Sprout?

Looking at a potato, it doesn’t look like something packed full of potential growth, right? It’s just a potato – perfect for cooking up in many different ways, not a powerhouse of life! But, under the right conditions, a potato contains everything necessary to grow a strong, healthy plant.

Potatoes are tubers, a type of storage organ that grows underground on a plant’s roots.

They are packed full of starch, which, when the conditions are right, provides energy to support growth in the form of shoots that emerge from the surface. These shoots develop into a new plant which produces more potatoes – one of nature’s incredible everlasting cycles!

Factors That Influence Potato Sprouting

Sprouting in potatoes is stimulated by exposure to warmth, light, and humidity. Just one of these factors can be enough to trigger sprouting, but a combination of two or all three will speed up the process:

Temperatures above 50F (10 °C) wake the potato from dormancy and encourage sprouting. Even if potatoes are stored in a dark, low-humidity place, increased warmth alone can lead to sprouting.
Increased light levels signal to the potato that conditions are right for growth, leading to sprouting and greening of the skin. Light isn’t essential to trigger sprouting – potatoes can still sprout in darkness if warmth and humidity are present.
Humidity can contribute to sprouting by preventing the potato’s skin from drying out and creating a favorable environment for growth. However, humidity alone is likely to lead to mold and rot rather than sprouting.

Another factor that increases the likelihood of sprouting in potatoes is ethylene gas. This is a natural plant hormone released by some fruits and vegetables, such as apples, bananas, and onions. If potatoes are stored near crops that produce ethylene oxide, they are likely to sprout more quickly.

How to Stop Potatoes from Sprouting

Proper storage conditions are vital to prevent potatoes from breaking dormancy and sprouting. This can be really inconvenient, as it limits what we can do with them.

We know that warmth, light, and humidity trigger sprouting in potatoes, so the key is to keep them in a cool, dark, well-ventilated space.

Good options for potato storage include:

A dark, dry pantry or cupboard away from appliances that generate heat.
A basement with good air circulation and stable, cool temperatures.
A traditional root cellar.
An insulated garage, as long as it doesn’t get too cold.
A dark, cool closet.

Is it safe to eat a sprouted potato?

When potatoes start to sprout, changes occur that can make them unsafe to eat. Sprouted potatoes contain higher levels of solanine and chaconine, naturally occurring toxins in the nightshade family of plants. The sprouting process may also have depleted nutrients within the potato, causing it to become wrinkled, soft, or shriveled.

The best way to decide if a sprouted potato is safe to eat is to look at the color and texture. First, cut away any sprouts and green areas, then look at the remaining potato. It can be cooked and eaten as usual if it is firm and has no off-putting odor.

Heavily sprouting, soft, wrinkled potatoes should be discarded. Consuming them can lead to symptoms such as nausea, vomiting, headaches, and, in extreme cases, neurological issues. If in doubt, throw them out!