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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.
Desiree potatoes are early maincrop potatoes and they are ready for harvest, if conditions are correct, 17 to 18 weeks after the seed potatoes are planted. The key factor governing the time for planting all potatoes is the date of the last frost in your area.