Finding a green potato in your pantry can be concerning, but the green color itself is not what makes the potato potentially harmful. Potatoes turn green when exposed to light because they produce chlorophyll, which is harmless. However, light exposure can also increase the level of solanine, a naturally occurring toxin that may cause nausea, stomach cramps, headaches, and digestive discomfort when consumed in large amounts. Knowing how to recognize the difference between a potato that can be salvaged and one that should be discarded is important.

If a potato is firm and has only a few small green patches, it may still be usable. Peel it deeply, remove all visible green areas, and cut away any eyes or sprouts. On the other hand, potatoes that are extensively green, soft, shriveled, or noticeably bitter are best thrown away. Cooking does not reliably destroy solanine, so boiling, baking, or frying should not be considered a way to make a badly affected potato safe.

Proper storage can help prevent potatoes from turning green in the first place. Store them in a cool, dark, dry, and well-ventilated place, such as a pantry basket or paper bag that allows air to circulate. Light and warmth encourage both greening and sprouting. It is also a good idea to keep potatoes away from onions, which may contribute to faster spoilage and sprouting. Raw potatoes generally should not be refrigerated because cold temperatures can change their starches and affect their flavor and cooking quality.

There is no reason to panic when you notice a small green area on a potato. Instead, examine it carefully before deciding whether to use or discard it. Firm potatoes with limited green areas can often be peeled deeply and trimmed, while heavily green or deteriorating potatoes should be thrown away. Buying only what you can use within a reasonable period and checking your potatoes regularly can also help reduce waste. When a potato looks questionable, discarding it is the safest option.