A well prepared seed bed will maximize the seed germination. Mow or clip the existing grass as closely as possible. Be sure to remove clippings. This will allow the new seed to make contact with the soil. In order to incorporate the seed into the soil, the soil must be loosened. In bare areas this can be done by tilling, raking or aerating. The idea is to loosen the soil enough to create a good lodging place and protection for the seeds. A common mistake is to work the soil too finely, so that after watering the surface tends to crust over and dry out quickly. Break the top surface of the soil to about ½ to 1 inch deep so that the seeds will make good contact with the soil and so favorable conditions exist for young root growth. Any large debris (rocks, sticks) should be removed and low spots should be leveled.