QuestionsHow to growVegetable GrowingPotatoesstored potatoes turning green 0 Vote Up Vote Down pat foley asked 16 years ago my sharps express potatoes are starting to turn green after two weeks in storage. they are in a dark house with little light and some are covered but they are also turning green. They are seed that I kept from last year. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Potatoes only turn green where there is light. There must be NO light of any kind…they even turn green on supermarket shelves!