Why Potatoes Turn Green in Storage
Potatoes turn green when exposed to light because it triggers the production of chlorophyll, the green pigment in plants.
The green color itself isn’t harmful, but it often comes with higher levels of a natural toxin called solanine, which can cause digestive issues or headaches if eaten in large amounts.
Can You Cut Off the Green Parts?
If only small areas under the skin are green, you can peel the potato and cut off about 2–3 mm of the flesh beneath the green spots to remove the solanine.
If the greening is extensive, or the potato tastes bitter, it’s safer to throw it away.
Cooking does not remove solanine, so boiling, baking, or frying won’t make green parts safe.
When to Discard Potatoes
Large green areas under the skin.
Bitter or unusual taste.
Soft, shriveled, or moldy potatoes.
Most potatoes in the batch are green, not just a few.
Storage Tips to Prevent Greening
Store potatoes in a cool, dark, and dry place.
Use paper bags or containers that block light but allow air circulation.
Avoid storing them in the refrigerator, as cold temperatures can affect texture and sometimes increase toxin concentration.
Bottom line: Green potatoes indicate chlorophyll, but they often signal higher solanine levels. Small green spots can be safely cut away, but heavily green or bitter potatoes should be discarded. Proper storage helps prevent greening in the first place.
