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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.
The number of days indicates the time it takes for a mature cabbage head to form under ideal conditions. For example, the variety called Cheers takes 75 days to mature while another green cabbage called Early Jersey Wakefield is ready for harvest about 63 days after planting.