Why You Shouldn't Lay Sod Over Bark Mulch: Rooting and Nitrogen Issues

Sod requires direct soil contact for root establishment. Bark mulch ("beauty bark") decomposes, stealing nitrogen and drying out, causing sod to fail in "fairy rings." Only fully composted, soil-like mulch might work, but it's risky. Proper prep: kill weeds, rake off all mulch, loosen soil, lay sod on bare earth, water, and roll lightly.