Can Walnut leaves be used along with other more common compost material for garden fertilizer?
Marion County Oregon
Thank you for your question. Walnut trees (Juglan species) have a chemical in them (juglone) that inhibits/kills growth in many other plant species. It is broken down (decomposition) over several months, but predicting when it is no longer a hazard is variable, since it depends on several external factors. You can read about it here: https://www.extension.iastate.edu/news/2005/jul/070701.htm Good luck!