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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.
How you handle seed potatoes plays a role in how well they grow. Seed potatoes larger than an egg should be cut into 1- to 1 1/2-inch chunks with at least two eyes; egg-sized or smaller tubers are planted whole.