QuestionsHow to growVegetable GrowingPotatoescomposting potatoe tops 0 Vote Up Vote Down ross tobin asked 14 years ago My early potato tops have grown to 18 inches high, should I pinch out the tops and can I compost them? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago That height is not exceptional. Leave them be. Potato haulms can be composted if healthy.