QuestionsHow to growRosesFeedingbanana skins 0 Vote Up Vote Down denis galavan asked 14 years ago I feed my roses with chopped banana skins my queston would banana skins be harmful to my buxus plants 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Banana skins contain small amounts of potash and this a useful food for most plants, although most garden soils are already sufficiently fertile.