QuestionsHow to growFruitAppleswood ashes 0 Vote Up Vote Down polly van velthoven asked 15 years ago Gerry…I put wood ashes on my fruit trees, but i use firelighters to start fire. How poisonous is this for my garden. Thank you. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Firelighters would have burned off completely, I would think, and leave no significant residue.