Quackgrass Control in Turf

Quackgrass is a cool-season perennial grass that spreads by long sharp white rhizomes. It forms coarse blue-green patches that are difficult to separate from desirable turf.

How to Identify Quackgrass

Leaf blades clasp the stem with small claw-like auricles, and underground rhizomes have pointed tips. Pulling shoots often leaves rhizome fragments behind.

Why It Appears in Turf

Disturbed soil, contaminated topsoil, and fragmentation of rhizomes spread infestations. Cool moist conditions support aggressive growth.

Make the Site Less Favorable

• Maintain the recommended mowing height and avoid scalping.
• Correct irrigation, drainage, compaction, fertility, or shade problems that thin desirable turf.
• Repair bare areas and use adapted turf cultivars to close openings where seedlings establish.

What University Research and Extension Guidance Says

Extension guidance generally treats quackgrass as a renovation problem because selective control in established cool-season turf is limited. Complete removal or repeated nonselective spot treatment must reach the rhizome network.

Choosing a Turf Herbicide

Perennial weeds often regrow from stolons, rhizomes, tubers, bulbs, or deep roots. Select a product labeled for the desirable turf and target weed, treat actively growing plants, and plan the complete sequence of repeat applications or renovation steps allowed by the label.

Research and label note: University research may discuss treatments or timings that are not permitted on every turf species or use site. Research evidence does not expand a product label. Confirm the desirable turf species, use site, target weed, application timing, rate, adjuvant directions, and reseeding restrictions on the current label before use.

University sources: University of Georgia Extension: Weed Control in Home Lawns.