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On average, potatoes mature in about 70 or 100-plus days. One clue that the potatoes are almost ready to harvest is that the leaves will yellow and the foliage will die back. It’s best to leave them in the ground for two or three weeks after this point so that their skins toughen up. Use a pitch fork and your hands to carefully dig them up.
Brush off dirt, wash and enjoy potatoes immediately. To store potatoes for later use, place them in a dry spot to cure for another two weeks. After curing, sort through the potatoes and discard any that are soft or shriveled. Place the rest in a cool, dry spot, where they should last for several months.