Controlling Nutsedge in Boxwood Hedges and Reviving Struggling Plants

Nutsedge (often called nutgrass) invading a newly planted boxwood hedge creates a dual problem: the aggressive weed competes for resources while the boxwoods show signs of transplant stress.

Targeted Nutsedge Control

For selective nutsedge control that won't harm boxwoods, apply a herbicide containing halosulfuron-methyl (sold under trade names like SedgeHammer or Manage). This product specifically targets nutsedge while leaving broadleaf plants like boxwoods unharmed. Apply according to label directions when nutsedge is actively growing.

Addressing Boxwood Transplant Shock

Yellowing, browning boxwoods four months after planting typically indicate transplant shock. Key recovery steps include:

• Watering: New transplants need near-daily watering unless rainfall is sufficient. Water deeply to encourage root establishment.
• Fertilization: Avoid high-nitrogen fertilizers that can burn tender roots. Use a balanced, low-nitrogen formula like 5-10-10.
• Root health: Since dug-up plants showed intact root systems, the issue is likely cultural rather than root disease.

Prevention for Future Plantings

Before planting, thoroughly remove nutsedge rhizomes and tubers from the planting area. Consider soil solarization or pre-emergent herbicides labeled for nutsedge prevention in ornamental beds.

With consistent moisture, appropriate fertilization, and targeted weed control, your boxwood hedge should recover and fill in beautifully.