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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.
Trench-grown potatoes typically emerge from the ground within two to four weeks of planting, depending on soil temperature. When your seedling potatoes reach 6 to 8 inches tall, pile a mound of loose soil around the base of each plant to within 1 inch of the lowest leaves.