Controlling Greenbrier (Smilax) in Ornamental Beds

Greenbrier (Smilax spp.) invading azaleas, wisteria, and boxwoods requires persistent, targeted herbicide application during active growth.

Effective Control Method

Cut stems as close to ground as possible. Immediately apply brush killer (triclopyr or glyphosate formulation) to cut surfaces per label. This translocates to the extensive rhizome system. Repeat as needed—multiple applications are typical.

Timing and Persistence

Treat during active growth (late spring through early fall) when translocation is maximal. Greenbrier's deep, woody rhizomes store immense energy—single treatments rarely suffice. Monitor for resprouts and treat promptly.

Physical Removal Limitations

Digging is rarely effective—rhizomes break easily, each fragment regenerating. Herbicide translocation is the only reliable approach for established infestations.

Protect desirable shrubs with cardboard shields during application. Consistency over 1-2 seasons achieves control.