My husband keeps dumping old coal ashes from the grill in my garden. I have a vegetable garden and would like to know if this will harm the plants. Thank you very much.
What Not to Put in Your Garden
Certified GKH Gardening Expert
I think this depends more on the type of charcoal used. If it's natural wood charcoal then it's okay to put the ashes in your compost or mixed in with the soil of your garden. If it is the type that has additives (chemicals), including lighter fluid, then I wouldn't use it in garden or even compost. Check the ingredients and the label. Also, be sure to let it sit for several months to age before using on plants when putting the ashes in the compost. Here is more information: https://www.gardeningknowhow.com/composting/ingredients/wood-ashes-compost.htm