How to Kill All Grass


Grass can grow in unwanted places, such as between the cracks of your sidewalk, in your garden, or perhaps in your lawn where you want to start over with new grass or just do something new. Whatever your reasons for killing your grass, you don't have to bring out the shovel and start digging it out. With the right herbicide and a quick application, all your grass will die within a couple of weeks.

Step 1

Choose an herbicide labeled to kill both weeds and grass, since weeds typically grow alongside grass. Many herbicides only kill the weeds, but others, such as ones that contain the active ingredients glyphosate or diquat, kill both

Step 2

Purchase the herbicide in a ready-to-use bottle, if desired. Or, choose one that hooks up to your hose for easy use. You can also purchase one that you have to dilute yourself and use in a separate herbicide applicator. If you do purchase an herbicide that is not ready to use, follow the directions carefully on the label on how to use and dilute it.

Step 3

Read the label to learn how long before an expected rain and at what temperatures you should apply the herbicide. Some herbicides need only 10 minutes to penetrate the grass before rain will wash them away, while others need a few hours. In addition, many herbicides need warm, sunny weather, such as warmer than 60 degrees Fahrenheit, to work most effectively.

Step 4

Wear protective clothing, including goggles, long pants and a long-sleeved shirt. In addition, keep children and pets indoors when you apply the herbicide.

Step 5

Apply the herbicide, usually by pulling a trigger. Move your arm in even, sweeping motions as you walk backwards across your grass. Expect the grass and weeds to completely die in one to two weeks. Spot treat any grass or weeds that survive as needed.

Things You'll Need

  • Herbicide
  • Protective clothing


  • PBI/Gordon Cooperation: Lawn Care Tips
  • University of Rhode Island: How Herbicides Work
  • Round Up Weed and Grass Killer: Example Herbicide Label
Keywords: kill grass, kill weeds, herbicide grass killer

About this Author

Melissa Lewis has been a professional writer since 2005. Her work has appeared in various online publications. A former elementary classroom teacher and media specialist, Lewis is also a script writer, with a movie script, "Homecoming," she co-wrote currently in production. She holds a Bachelor of Arts in psychology.