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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.
With a life span of roughly 70 to 120 days, depending on variety, they are ready to harvest any time after flowering ends to when the plants wither. After the plants die back, potatoes stop growing, but can be left for several days in soil that is not too wet and in temperatures that have not dropped to below the freezing mark.