St. Augustine grass grows along the Gulf coast and in other warm climates. While native to coastal areas, St. Augustine grass does not tolerate soggy soil conditions, but rather prefers slightly moist soil. If grown inland, weekly waterings with about an inch of water are necessary when rainfall is lacking. If your St. Augustine grass is not thriving, there are a few ways you can attempt to restore the lawn.
Mow at the proper height and at routine intervals, especially if you have a lot of weeds. In the sun, mow St. Augustine grass 1 to 2½ inches every 5 to 10 days. In the shade, mow St. Augustine grass at a height of 3 inches every 10 days. Raise the mowing height ½ inch beginning in the fall to prepare the grass for winter.
Fertilize St. Augustine grass every month from spring until fall. Use a high-nitrogen fertilizer; the first number on the fertilizer label indicates the nitrogen level. Use 1 lb. for every 1,000 square feet in sandy soil and ½ lb. for every 1,000 square feet in heavier soils.
Cut the fertlizer dose in half if the grass is yellow, which may be a sign of overfertilization. Reduce fertilizing to once every six weeks.
Apply an insecticide or fungicide to treat insects or disease, following the application and timing recommended on the label.
Remove or kill weeds in St. Augustine grass. Mowing at a proper height will help control weeds, as will manual pulling. Apply an herbicide, if necessary.