Why Do Potatoes Turn Green? Understanding the Phenomenon

Yellow and red raw potatoes with oil, salt and pepper in rustic setting.

Share on Social

Potatoes are a versatile and beloved staple in many cuisines around the world. They can be mashed, baked, fried, or boiled to create a variety of delicious dishes. However, have you ever noticed that sometimes potatoes develop a greenish hue? This phenomenon can be perplexing but fear not! We’ll delve into why potatoes turn green, whether they are safe to eat, and how you can prevent them from undergoing this color change.

The Culprit: Chlorophyll and Solanine

The primary reason behind the green coloration of potatoes is the presence of chlorophyll. Chlorophyll is the pigment responsible for the green color in plants, and it plays a crucial role in photosynthesis. When potatoes are exposed to light, especially sunlight, they begin to produce chlorophyll as a natural response.

Another compound, called solanine, can also accumulate in potatoes when they are exposed to light. Solanine is a natural toxin found in various members of the nightshade family, including potatoes. It serves as a defense mechanism against pests and diseases. While small amounts of solanine are generally harmless, consuming large quantities can lead to gastrointestinal symptoms like nausea and vomiting.

Are Green Potatoes Safe to Eat?

The presence of chlorophyll and solanine in green potatoes raises the question: Are they safe to eat? While small patches of green on potatoes can be trimmed away, indicating that only a minimal amount of solanine has developed, it’s essential to exercise caution.

If a potato has turned entirely green or exhibits significant greening, it’s best to err on the side of caution and discard it. Consuming large quantities of solanine can pose health risks, particularly for vulnerable individuals such as children, the elderly, and those with compromised immune systems. Additionally, bitter taste or off-odor accompanying the green coloration are signs that the potato may be unfit for consumption.

Preventing Potatoes from Turning Green

Now that we understand why potatoes turn green and the potential risks associated with green potatoes, let’s explore how we can prevent this color change:

Proper Storage

Store potatoes in a cool, dark place away from sunlight. Exposure to light accelerates the production of chlorophyll and the formation of solanine. A pantry or cellar with good ventilation is ideal for storing potatoes.

Avoid Sunlight Exposure:

When purchasing potatoes, choose ones that are not already green. Keep them in opaque containers or cover them with a cloth to shield them from light exposure.

Inspect Regularly

Check your potatoes periodically for any signs of greening. If you notice any green patches, trim them away before consuming the potato.

Consume Promptly

Use potatoes promptly to minimize the likelihood of them turning green. Avoid storing them for extended periods, especially in areas prone to light exposure.

By following these simple steps, you can reduce the likelihood of your potatoes turning green and ensure that they remain safe and delicious to eat.

While the sight of green potatoes may be alarming, understanding the reasons behind this color change and taking appropriate precautions can help mitigate any potential risks. By storing potatoes properly and promptly addressing any signs of greening, you can enjoy this versatile vegetable in its optimal form, free from any unwanted coloration or toxins. Happy cooking!

Other blog posts

Jalapeño Popper Potato Soup

Potato Soup 101

There’s something undeniably cozy about a warm bowl of potato soup. It’s creamy, hearty, and full of flavor – the perfect dish for chilly nights

Read More