Weed Management in Established Groundcovers: Pre-Emergents and Spot Treatment

Using Preen for Annual Weed Prevention

Preen (trifluralin) stops weed seeds from germinating. Apply in early spring and fall.

Why Selective Post-Emergents Don't Exist

No herbicide kills weeds but spares wintercreeper. Spot treatment is necessary.

Treflan Risks and Alternatives

Treflan (trifluralin) can damage desirable perennials and grasses if misapplied. Avoid.

Persistent Spot Treatment for Perennial Weeds

Regularly hand-pull or spot-spray glyphosate (shielding groundcover). Torpedo grass may require total renovation.