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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.
Seed potatoes are those grown in a previous season that have produced tubers and are used to grow potato crops. Once planted, the sprouts of seed potatoes will come out of the ground in two to four weeks. New in Getting Started with Vegetables.