QuestionsHow to growVegetable GrowingHerbs, Sagepest on sage 0 Vote Up Vote Down Ann asked 16 years ago I have a sage plant indoors. It has a white powdery deposit on the leaves but is still growing. I cannot see any insects on it. Any advice would be appreciated! Thanks. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Sage is not an indoor plant in any circumstances. Put it outside and it will clear up.