Weed Control in Newly Sodded Meyer Zoysia

A homeowner installed Meyer Zoysia sod on July 1 and now faces crabgrass, ornamental grass, and clover despite regular watering in hot, dry conditions.

Why Weeds Appear in New Sod

New sod has seams and open spaces where weed seeds germinate. The sod was likely harvested from fields with weed seeds in the soil. Frequent watering for establishment also encourages weeds.

Recommended Strategy

1. Be patient. Zoysia forms a dense, competitive mat when mature. Most weeds will be shaded out as the sod knits together.
2. Mow regularly once the sod is rooted (about 2–3 weeks). Mowing at 1–1.5 inches removes weed seed heads and encourages lateral spread.
3. Apply pre-emergent herbicide in fall (October) and again in February to stop winter annuals like Poa annua and clover. Use a product safe for Zoysia.
4. Avoid post-emergent herbicides on new sod; they can damage tender roots.

What Not to Do

Soil fumigation before sodding is impractical for residential lawns and can hinder establishment. Trust Zoysia’s natural competitiveness.

By next growing season, a properly maintained Zoysia lawn will crowd out most weeds without heavy chemical intervention.