Does anyone have any experience with using allelopathic leaf fall as a natural “roundup” to kill grass? I have a large lawn above a leech field that I am trying to convert into a natural meadow (with shallow rooted + drought tolerant grasses and wildflowers) and want to kill off the grass naturally prior as I don't want to dig up too much above the leech lines trying to remove the grass. I have a BUNCH of California Pepper Trees along with all the leaves that have fallen over the years on another part of the property, and I know they are allelopathic, nothing grows underneath them... So would using the leaves piled ontop of the grass during the winter mixed with rain kill off the grass? Also, for how long would the toxin in the leaves last in the soil? Would that be futile to try planting wildflower above it later?
