Once sweet potatoes turn mushy, you can be sure that they have gone bad. Usually, their ends become soft before turning brown or black. As soon as these parts spoil, the flavor of the whole tubers will be affected. In some cases, you can see wrinkles on the surface.
When should you not eat sweet potatoes?
As sweet potatoes begin to spoil, they will shrivel (like the one on the photo above) as they lose moisture. The veggie will then become mushy and turn brown or black. Do not eat sweet potatoes once they have begun to shrivel, and certainly not past this point.
What does a rotten sweet potato look like?
Spoiled sweet potatoes have soft, spongy spots. They might have turned dark brown or black. Any mold is suspicious. Reject sweet potatoes that show signs of shriveling.
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