Nutsedge looks much like a grass and is often called nutgrass. It has sharply rolled leaves that sprout from a small nut-like tuber. The leaves of this plant can penetrate and grow through ALL mulches. It has been shown to penetrate pool liners, concrete and asphalt. The only cure for this weed is avoidance or continuous tillage and hand weeding.
Mulches can provide the gardener a valuable weed management tool if used properly.
The keys to successful mulches are selecting a proper mulch, avoiding problem weeds and preparing the garden before applying mulch.