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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.
Potato eyes are what you plant to grow potatoes. Every potato has eyes. Potato eyes are the dimples on each potato that begin to sprout pinkish-white root buds. Left alone, sprouted potato eyes will become potato plants. Larger potatoes have more eyes, which can grow into more potato plants.