How to Kill Water Grass

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Water grass is a general term used to describe a wide variety of grassy weed species. It thrives in a wet environment. Some species grow in water, while others thrive on soggy ground and lawns. It's important to kill water grass because it can choke off other plants. Methods of eliminating water grass depend on where it's located.

Things You'll Need

  • Herbicide
  • Tarp
  • Rocks
  • Garbage bags
  • Soil
  • Grass seed
  • Sod
  • Goat
  • Grass carp
  • Treat the grass with a non-selective herbicide. The University of Illinois Extension and Texas Agrilife Extension Service websites both recommend a herbicide with a glyphosate solution. Consult a local department of agriculture to find out what herbicide works best.

  • Block the sunlight where water grass is growing. Place a weed cloth over area and cover with a tarp, rocks or garbage bags. Water grass does not need a lot of sunlight, but it does need some. This method will only work in small areas of water grass growth.

  • Dig up the water grass thoroughly. Dig deeply to remove the roots. Dig carefully to avoid spreading seeds to other areas.

  • Remove the source of the water, if possible. Grade the lawn and stop water from draining into the area.

  • Spread dry soil and reseed (or resod) the dug-up area. Apply a fertilizer regularly.

  • Allow a goat to graze in the area. Stock grass carp in ponds (or lakes) with water grass. Goats and fish will feed off the water grass shoots. They won't kill the water grass, but they will control its growth.

Tips & Warnings

  • Removing all the seeds and roots is difficult, so don't be surprised if some water grass grows back.

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