St. Augustine

Homeowner Maintenance Guide


1.5–2 inches

1 inch per week total

Preventative Fungicide & Insecticide

Seasonal Maintenance Guides for your St. Augustine


  • Mow your St. Augustine between 1.5 to two inches tall.
  • Apply pre-emergent herbicide. This will cut down on summer weeds. You can click to read more about home  products.
  • If you have had insect problem in the past, treat with broad-spectrum insecticide. If you use a granular variety, water the lawn immediately after application to help soil absorption. Make sure it has control for chinch bugs.
  • Don’t overwater. In the active growing season, St. Augustine needs about one inch of water a week from natural rainfall or irrigation. Too much water can cause fungus.
  • Apply fungicide if needed. If you have had a fungus or disease in your St. Augustine in the past or have quite a bit of shade in the yard, apply a systemic fungicide to prevent future outbreaks.

Get the Perfect Spring Fertilizer Box made for your St. Augustine



  • When mowing, never remove more than 1/3 of the leaf blade at a time. If you need to cut more than 1/3, consider multiple cuts over three to five days.
  • Do not overwater the grass. St. Augustine only needs about one inch of water weekly. Water for longer periods of time, less frequently, and in the early morning hours. Take rainfall into consideration.

Get the Perfect Summer Fertilizer Box made for your St. Augustine



  • Apply fungicide. This will help the grass enter colder months in healthier condition. If you have had fungus before, you may need multiple applications in affected areas.
  • Treat with broad-spectrum insecticide. If you use a granular variety, water the lawn immediately after application to help soil absorption. Make sure it offers control for chinch bugs.
  • Mow less in cooler fall months. Leave your St. Augustine lawn slightly higher than normal to encourage deeper root growth for winter. Adjust mower settings up one notch.
  • Water less. As temperatures drop grasses don’t need as much irrigation. Too much watering can lead to lawn disease.
  • If you haven’t had past problems with winter weeds, you can forgo herbicide in the fall. If you do get winter weeds, apply a pre-emergent herbicide for prevention.

Get the Perfect Fall Fertilizer Box made for your St. Augustine


St. Augustine Maintenance Tips

Soil Management

  • Soil test every two years.
  • Amend soil to maintain pH between 6.0 and 7.0
  • Know your soil type!


  • Sharpen blades every spring.
  • Keep mowed between 2 to 4 inches.
  • Don’t cut of more than 1/3 the blade.


  • Don’t Overwater
  • Water less in cooler fall months
  • About 1 inch a week total irrigation spring & summer
  • Water deeply, frequently, and in early AM

Weed Control

  • Pre-emergents prevent weeds from germinating
  • Post-emergents kill weeds after they germinate
  • A thick, lush lawn is the best deterrent to weeds

Disease Control

  • Overly wets grass + shade = fungus problems
  • Apply systemic fungicide to prevent fungus outbreaks
  • Use multiple fungicide applications to treat affected areas

Insect Control

  • Use a broad spectrum insecticide that controls chinch bugs
  • For a once-a-year treatment, July & August are good months
  • Drought-stressed lawns are more susceptible to chinch bug injury
  • If using a granular insecticide, water in after application


A pre-emergent contains a chemical that prevents a weed from putting down roots. Because it is a root inhibitor, it can also negatively affect your new lawn, which is trying to establish itself by putting down roots. If you successfully killed and removed your old lawn, including all the weeds in it, your newly sodded lawn should have relatively few weeds. It is suggested that you hand pick weeds out of your newly sodded lawn for the first season.


Three Seasons Bought Together Saves money! With Free Shipping!

Pay Monthly Pay Annually