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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.
There are many varieties of corn and it will take between two to a little over three months to harvest, depending on the variety. Lettuce, spinach and some varieties of potatoes also take about two to three months to grow to maturity. Potatoes.