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Walnut leaves can be composted, but precautions are necessary due to juglone, a substance that can inhibit plant growth. Proper preparation and decomposition time are essential for safe use in gardens. Shredding leaves and mixing them with nitrogen-rich materials can enhance composting. It's important to allow sufficient time for decomposition, typically 9-12 months, to ensure the compost is mature and safe for sensitive plants. Additionally, walnut leaves can be used as mulch, but care should be taken to avoid thick layers that can suffocate plants. Following guidelines can help utilize walnut leaves effectively without harming garden plants.