Set your garden hose's nozzle to a medium setting, so that you do not spray your seeds off the lawn. Also, deep watering will encourage the seeds and seedlings to grow deep root systems.
Walk back in forth across the lawn spraying the newly sown grass seed with a garden hose. Dig a hole that is 6 to 8 inches in depth. Feel the bottom of the hole to see if it is dry. Dry soil indicates that you need to apply more water to the lawn.
Walk across the lawn the next day in the morning. To avoid fungal diseases, don't water your lawn in the late afternoon. Spray your grass seed with water. Water again in mid-afternoon. Dig another 6- to 8-inch hole to check if the soil is moist. Water this way every day until you see the seeds sprouting.
Apply water every other day when you see the lawn covered in seedlings. Walk across the lawn everyday and spray any areas that are discolored or a dull gray.
Reduce watering your lawn after a week of watering seedlings to once or twice a week. Mow the lawn when the grass grows to 3 to 4 inches. After a month, give your lawn its recommended water application. For instance, St. Augustine grass needs 3/4 of an inch of water a week.