The process of lawn aeration and overseeding involves poking holes into an existing lawn and then spreading grass seed over it. Overseeding helps grass grow in areas that are weed-choked or thin, and the thicker grass is more resistant to disease and insects.
A homeowner can overseed a lawn without aerating it, but aeration allows for better seed germination. Cool-season grasses benefit from spring or fall aeration, and warm-season grasses thrive with aeration in the late spring. A homeowner can apply grass seed evenly by using a drop seeder or rotary spreader. New grass seedlings require regular light watering until the grass is mature.