Cedar Mulch: Great for Gardens, Bad for Lawns

Cedar's Polyphenols Repel Pests—And Earthworms

Cedar mulch (cypress, pine, cedar, hardwood) contains polyphenolic compounds that resist decay and repel slugs, snails, and fungi. Great for vegetable beds (reduces fungal diseases). Terrible for lawns.

Why Not on Grass?

• Earthworms avoid cedar—loss of aeration and nutrient cycling.
• Beneficial fungi (mycorrhizae) suppressed.
• Acidic pH harms lawngrass.
• Decomposes too slowly to benefit turf.

Bonus Warning: Cocoa Bean Mulch

Contains theobromine (chocolate toxin). Fatal to dogs and cats if ingested. Avoid if pets access the area.