QuestionsHow to growLawnsFeedingWood ash 0 Vote Up Vote Down Ros Hamilton asked 15 years ago I have been told that wood ash from a small iron stove are so burnt out that they are useless for the garden. Is this so? At the moment I throw them onto the lawn, is this OK? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Wood ash contains small but useful amounts of potash and can be beneficial around apple trees and rose bushes, but not much good on the lawn.