How to Kill St. Augustine Grass


St. Augustine grass, Stenotaphrum secundatum, is a warm-season lawn grass that is found along the Gulf Coast in the United States. It spreads from above ground stolons that spread out from the main plant, root into the ground and form a new plant. In certain circumstances, St. Augustine grass might be growing where it is not desired, or it might have spread beyond its boundary. St. Augustine grass is killed easily with a non-selective herbicide such as Roundup. Proper application is essential to achieve adequate kill and to prevent injury to surrounding plants.

Step 1

Read the label on your non-selective herbicide and pour the appropriate amount into your pump-up sprayer.

Step 2

Fill your pump-up sprayer the rest of the way with water. Fill it up over a paved surface in case the chemical accidentally splashes out of the sprayer.

Step 3

Pump up the sprayer and spray your St. Augustine grass until the foliage is completely soaked.

Step 4

Reapply the non-selective herbicide in two weeks to areas that didn't achieve total kill.

Step 5

Remove the dead St. Augustine turf with a shovel or till under with a rototiller. Your area is now ready for planting or other landscaping.

Tips and Warnings

  • Read the non-selective herbicide bottle carefully to see how soon it can be applied after a rainfall or how soon before a rainfall it has to be applied. Failure to follow the directions may result in the herbicide being ineffective.

Things You'll Need

  • Non-selective herbicide
  • Pump-up sprayer
  • Water
  • Shovel or rototiller


  • Texas Cooperative Extension: St. Augustine Grass
  • Scotts: Roundup Weed and Grass Killer
Keywords: kill st. augustine, st. augustine grass, non-selective herbicide, pump-up sprayer, remove st. augustine

About this Author

Robin Gonyo has been writing for several years now. She has a deep love for gardening and has spent a vast amount of time researching that subject. Previously she has written for private clients before joining Demand Studios. She hopes to share her knowledge with others through her writing.