According to the University of Florida IFAS Extension, St. Augustine grass is typically found in warmer climates, such as the Carolinas, Mexico and Florida. It is native to sandy beaches, lagoons, shorelines and marshes but is slowly adapting to inland areas. St. Augustine grass doesn't grow well in the colder winter climates, so it sticks to more temperate climates. Like other types of grass, St. Augustine can be planted by seed. That's also the process used to restore St. Augustine grass in sunburned areas.
Plant St. Augustine grass seed in the fall or spring, when temperatures are more mild. It will still grow in the summer, but it requires less attention and less water if you plant the seed in the fall or spring.
Loosen the soil in the sunburned areas. Use a rototiller if it's a large space or a rake or hoe for smaller lawns. Dig into the ground about 6 inches.
Remove weeds and debris from the planting area to ensure the seeds root well. Smooth and level off the area with a metal rake.
Spread St. Augustine grass seed out by hand. Sprinkle it so that it covers the sunburned areas. Don't lay down seed on top of other seed or you'll force them to fight for nutrients.
Water the area thoroughly using a hose with a fine mist. You want the soil moist but not soaked, or the seed will move around.
Do short waterings several times a day for the first week to 10 days. Once the roots start to grip into the soil, decrease to watering once daily with a quarter- to half-inch of water for one week. Then reduce watering to two to three times a week.