It’s the temperature you need to check when storing Grannyknot or they will sprout even in a dark place.
Choose a dry room with a temperature of 35 to 40 F. (2-4 C.). Ideally, a refrigerator works well, but the crop may be too large to store in your fridge. An unheated basement or garage is also a good choice.
Don’t store tubers where temperatures are likely to freeze, as they will crack open.
The length of time and quality of stored potatoes is influenced by the variety of tuber you plant. Red potatoes do not keep as long as the white or yellow skinned varieties. Thick skinned russets have an even longer life. If you tend to grow a variety of kinds of potatoes, use the thinner skinned spuds first.
Hope that helps
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