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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.
Initial Planting Depth. Seed potatoes should be planted 3 to 4 inches deep in the soil. A simple way to plant potatoes is to dig a trench 3 to 4 inches deep along the length of the garden bed and place the seed potatoes 9 to 12 inches apart in the trench. After covering the row with soil, the seed potatoes can be left alone until they germinate and sprout. Seed potatoes take eight to 16 days to sprout.