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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 can be grown anywhere from sea level to 13,000 feet. The growing time for red potatoes can be from 70 to 120 days, depending on the variety you choose to plant and what size you like your potatoes. There are early, medium-and late-maturing varieties.