Fastest Way to Kill Pampas Grass


With a height of up to 10 feet, a clump of pampas grass can make an impressive addition to your backyard. Due to its size, this ornamental grass can also overwhelm your landscape. If you change your mind about growing pampas grass, or if you acquire a backyard with pampas grass, you may be tempted to dig it out. This takes a long time, especially for mature clumps. Instead, go the faster route and chop it down before treating it with an herbicide.

Step 1

Cut the pampas grass down to a height of 3 feet, or less, with pruning shears. Grasp a handful of pampas grass leaves together in a bundle and chop them away with the pruning equipment. Repeat until the entire pampas grass clump has been reduced to a more manageable size.

Step 2

Spray what remains of the pampas grass clump with a standard glyphosate-based herbicide. Mist onto all exposed surfaces of the pampas grass, applying according to the guidelines on the herbicide's label as toxicity varies widely by product. The grass will die within two weeks.

Step 3

Dig out the dead pampas grass, or leave it in the ground to decompose.

Tips and Warnings

  • If you try to dig out a pampas grass clump while it is alive, you run the risk of leaving behind bits of live grass stems and roots that can grow into new pampas grass clumps. Glyphosate kills all vegetation, so avoid getting it on any plants that you wish to keep.

Things You'll Need

  • Gloves
  • Long-sleeved shirt
  • Pruning shears
  • Glyphosate-based herbicide


  • "The Encyclopedia of Ornamental Grasses: How to Grow and Use Over 250 Beautiful and Versatile Plants"; John Greenlee, et al.; 1992
  • "Ecology of Weeds and Invasive Plants"; Steven Radosevich, et al.; 2007
Keywords: kill pampas grass, remove pampas grass, fastest pampas killer

About this Author

Josh Duvauchelle is an editor and journalist with more than 10 years' experience. His work has appeared in various magazines, including "Honolulu Magazine," which has more paid subscribers than any other magazine in Hawaii. He graduated with honors from Trinity Western University, holding a Bachelor of Arts in professional communications, and earned a certificate in applied leadership and public affairs from the Laurentian Leadership Centre.