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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.
Maturity and variety also affect the texture of sweet potatoes. 4. Q. How do you know when sweet potatoes are mature and ready for harvesting? A. Sweet potatoes can be harvested at any stage of maturity. They require 100 to 140 days from planting to maturity depending on variety. Harvest sweet potatoes before the first killing frost because cool conditions can physiologically damage roots.