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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.
You can expect about 50 pounds of edible potatoes from only 2 pounds of seed potatoes. Potato plants grown from small tubers or seed potatoes usually emerge within three to four weeks when you use certified seed potatoes, give them proper growing conditions and keep them free from disease.