How to Kill Couch Grass


Couch grass originated in Europe and Western Asia but has spread around the world. Couch grass is extremely invasive and can quickly choke out and destroy other grasses in a lawn or completely dominate a flower bed or vegetable garden. Couch grass should be dealt with as soon as it appears. Couch grass spreads by both seeds and rhizomes (roots), and is very difficult to eradicate.

Step 1

Keep couch grass mowed so it cannot seed. However, frequent mowing will not kill couch grass, as it can still spread by underground rhizomes.

Step 2

Talk to your local nursery or home improvement center about a weed-specific herbicide designed to kill couch grass but not other plants you have. Spray the herbicide on a windless day and do not spray if rain is forecast within 24 hours.

Step 3

Use a broad-spectrum herbicide such as Roundup if the selective herbicide fails to kill the couch grass. Be as selective as possible when spraying any herbicide containing glyphosate, as the chemical will kill virtually all plants it touches, not just couch grass. Spray when there is no wind and do not spray if rain is predicted within 12 hours.

Tips and Warnings

  • Digging up couch grass can work if you are able to dig down at least 6 inches and remove all of the roots. Never hoe couch grass, as even small pieces of broken root can regrow, spreading couch grass very quickly.

Things You'll Need

  • Selective herbicide
  • Nonselective herbicide


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Keywords: kill couch grass, eliminate couch grass, end couch grass

About this Author

Larry Parr has been a full-time professional freelance writer for more than 30 years. For 25 years he wrote cartoons for TV, everything from SMURFS to SPIDER-MAN.