St. Augustine Grass Maintenance


St. Augustine is a warm-season grass found predominantly in the Gulf Coast states of the United States. Unlike other warm-season grasses, St. Augustine grass prefers to be mowed long, which allows you to wait longer between each mowing. Proper maintenance of St. Augustine grass is crucial for it to grow and thrive.

Step 1

Fertilize your St. Augustine lawn with 1 lb of nitrogen every 30 to 60 days throughout the entire growing season from early spring to late fall. Use a broadcast spreader to evenly distribute the fertilizer over the entire lawn.

Step 2

Mow your St. Augustine grass every seven to 10 days with at a cutting height of 2 1/2 inches. If the lawn is in dense shade, mow at 3 inches every 10 days.

Step 3

Inspect the turf in midsummer to check for grub infestations. Use a flat spade and lift up a section of grass. If grubs are noted, apply an insecticide at the product's recommended rate to kill the grubs.

Step 4

Prevent annual grassy weeds with a timely application of pre-emergence herbicide. The herbicide should be applied when soil temperatures reach 50 degrees F in the spring. Apply at the bag's recommended rate with your broadcast spreader.

Step 5

Control broadleaf weeds with atrazine, which is a post-emergence herbicide. Apply at the product's recommended rate when the air temperature is below 85 degrees F.

Step 6

Irrigate only when the lawn shows signs of wilting. Set up sprinklers and provide 1/2 to 3/4 inch of water when the lawn first shows these signs of wilting. Watering requirements will depend on how much natural rainfall occurs.

Things You'll Need

  • Lawn fertilizer
  • Broadcast spreader
  • Lawnmower
  • Flat spade
  • Insecticide
  • Pre-emergence herbicide
  • Post-emergence herbicide
  • Lawn sprinklers
  • Garden hose
  • Dethatcher


  • Texas Cooperative Extension: St. Augustine Grass
  • University of Florida IFAS Extension: St. Augustine Grass for Florida Lawns
Keywords: st. augustine grass, grass maintenance, broadcast spreader, mowing height, pre-emergence herbicide, post-emergence herbicide

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.