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But it can take 70-90 or more for potatoes to mature. This depends on the variety. The potatoes can carefully be harvested at 7-8 weeks for a early harvest of small potatoes. For full grown potatoes you would harvest in the fall when the leaves turn brown. But it can take 70-90 or more for potatoes to mature.
Potatoes grow from small potato pieces called seed potatoes. A mature potato tuber produces buds, with each bud capable of growing into a new plant. Cutting apart large seed pieces allows you to grow multiple plants from a single seed potato.otatoes grow from small potato pieces called seed potatoes. A mature potato tuber produces buds, with each bud capable of growing into a new plant. Cutting apart large seed pieces allows you to grow multiple plants from a single seed potato.