Answer: A frost should prompt the tops of your potato plants to begin turning yellow. Potatoes should be harvested after the tops wilt, which is generally after they've been subjected to a frost, but you can hurry the process along by bending the tops down. (No pun here!) Whether you allow weather to wilt the tops or you bend them down and step on them, you certainly will want to harvest the spuds before a hard frost, or their storage life will be affected.
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