There was some query concerning Walnut leaves compost containing toxin in the Tropical section. Here is my answer.
We have few Black walnut and English walnut trees. We move all fall-leaves from all different trees together and shred it and pile up in 5 different areas and at times use it as needed as mulch for garden (including vegetables) and trees. The toxin in the leaves will be neutralized naturally during the process of composting within 2 months or so. I have been doing this for decades. Triphal