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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.

Depending on the lawn treatments, the best times of the year to redo your lawn are between mid-August and mid-September for overseeding and renovation treatments. For areas such as the southern United States, lawn aeration works best during the fall, when the temperatures begin to drop. Otherwise, early spring is your next best bet because the grass is fresh and ready to absorb nutrients, and the temperature isn’t hot enough to fry the grass and the renovation materials.

Slit seeding takes about two to three hours for a medium or large lawn. Even bigger lawns or commercial properties can be seeded in about one day. From there, it will take about two weeks for the grass to start growing and another six weeks for the grass to establish stronger roots.

If your grass is stressed from being over-trimmed, try watering it heavily and then allowing it to recover for at least two weeks before mowing again. If you notice brown patches where the grass has died off because it’s too short, you should remove the dead grass and overseed the area. Leaving dead patches can invite weeds and other problems, so if you want a totally green lawn, getting rid of dead patches should include removing the dead sections before reseeding the area.