Hilling up much beyond six inches brings no benefits and is likely to reduce yield. The purpose of hilling is not to stimulate production of tubers, but to protect the tubers from the environment. Potato yield is primarily limited by foliage area, not by the amount of soil above the seed tuber. Conventional container growing works fine with potatoes but potato towers don’t work.
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September-October Homestead Skills Jamboree 2019https://permies.com/wiki/118704/permaculture-projects/September-October-Homestead-Skills-Jamboree