What Causes Green Marks on Potato? - Knowledgebase Question

Canonsburg, PA
Question by ronaldkuslo
September 19, 2000
The I dug up a few potatos this year and found a few had green marks on them. What causes this? Also is this poisonous to eat?

Answer from NGA
September 19, 2000


If potato skins are green, it's usually because they got hit with some direct sun, which caused chlorophyll to form. Tubers are mildly poisonous at this stage, but you'd probably have to eat an awful lot of them to get sick. If you have just a small green patch on the surface, cut it off. The rest of the potato should be fine.

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