You can harvest any time about 2-3 weeks after flowering but the potatoes will continue to increase in size as long as the plants are still growing.
Most of my plants were wilted over and mostly brown. I wasn't going to harvest all of them since a few of the plants like the one in the picture were still fairly green although they were limp. However I saw a vole and was finding a few potatoes chewed so I decided that it was time to harvest even if the plants were not totally brown. I had about 12 large potatoes with bite marks so I cut that part off and cubed and blanched those potatoes for the freezer.
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