Pecan Leaves as Garden Mulch: Proceed With Caution

Pecans, like walnuts, produce juglone, a compound that can inhibit some plants. Juglone levels vary by variety, weather, and season. Composting degrades juglone, but it's hard to know when it's safe. To be cautious, avoid using fresh pecan leaves directly on vegetable beds; compost them first or use elsewhere.