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Overseeding typically involves spreading grass seed either manually or with a machine that sprays the grass seed out and onto the soil. With overseeding, the grass seeds sit on the soil, and some may fall deeper into the soil if you aerated beforehand. With power seeding, a machine cuts narrow rows into the soil and pushes the grass seeds directly into the soil.

You can reseed a lawn that has dead grass, but it is best to remove the dead patches before you begin. Removing the dead turf and testing the soil will help you determine what is killing the grass so you can make the necessary amendments to prevent the problem from recurring. Once you have made the appropriate adjustments, you can rake, fertilize, and reseed. If your lawn has many large dead patches, it may be more effective to remove all the existing grass, amend the soil, and start over from scratch.

You can fill the holes weeds leave behind with soil or sand to avoid unsightly spots or tripping hazards. If you remove weeds from a grassy area, fill the hole with soil and grass seed, and water regularly to promote grass growth.

For optimal results, water newly planted grass seed at least twice a day—once in the morning and again in the late afternoon. The goal is to keep the soil consistently moist for the first two weeks, but be careful not to overwater or flood the seeds. After about two weeks, you can reduce the frequency to once per day. Always monitor weather conditions and adjust your watering schedule accordingly; for instance, you won't need to water as much if it rains.