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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 are typically grown from seeding potatoes. The two types of seeding potatoes are small whole potatoes and a cut piece of potato. However, both types must have at least two eyes on it. If you choose to use cut up pieces, you will want to cut up your potato 2 to 4 days before you plan to plant them. Keep them out of direct sunlight and at room temperature.