Permanent lawns in Florida become dormant during winter, turning an unattractive brown. Golf courses and athletic field managers solve this problem by overseeding lawns with annual ryegrass. Ryegrass is a cool-season grass that thrives in temperatures below 80 degrees F. Florida homeowners can overseed their lawns, as well, resulting in a green lawn, year-round. Ryegrass requires irrigation, fertilization and weekly mowing, so consider whether you want to maintain a lawn all year before planting.
Rake the lawn to remove all debris. Mow the lawn to a height of 2 inches. Mow St. Augustine grass to 3 inches.
Place one-half of the recommended amount of ryegrass seed in the broadcast spreader. Walk slowly across the lawn in a back and forth motion, spreading the grass seed. Place the remaining lawn seed in the spreader and walk across the lawn at a right angle to the direction you previously spread the seed.
Brush the grass with a stiff broom to work the seed down through the permanent grass to the soil surface.
Water the grass two times a day for the first two weeks until the ryegrass seed germinates. Water for 20 minutes during each cycle and use a gentle sprinkler. Thereafter, water the lawn every week, depending on rainfall, to keep it from wilting.
Mow the grass when it stand 2 inches taller than the permanent lawn. Apply a lawn fertilizer, according to package directions, after mowing.