Stopping Zoysia Grass Invasion with a Barrier Trench

Zoysia grass spreads aggressively via underground rhizomes and above-ground stolons. A plastic edging barrier often fails because runners grow over or under it. The most effective physical barrier is a maintenance trench.

Dig a trench 12 inches deep and 12 inches wide along the property line. Shape it like a check mark: vertical wall on your side, 45° slope on the neighbor’s side. This exposes runners attempting to cross, making them easy to sever with an edger during routine mowing. Fill the trench with light mulch (straw, not compost) to keep it open.

Recut the trench annually to maintain a clean edge. Sever runners every time you mow. This method contains zoysia without chemicals and preserves your preferred cool-season grass.