Overseeding guarantees you a thicker lawn. A dense yard of grass effectively holds soil and water in place, reducing run-off and soil erosion. This improves your lawn's health by allowing it to contain moisture and nutrients.

Is overseeding necessary?

You should plan to overseed at least every 3 to 4 years, but, if you aerate and overseed every year, you'll see real nice results -- a lush, green lawn that fends off weeds, insects and diseases.

Does overseeding your lawn really work?

The experts all agree that regular overseeding is vital to help thicken your lawn and fill in bare spots, which reduces or eliminates competition from weeds. The reasoning is that young grass will produce new growth faster than older grass. After several years, mature plants begin to slow down their reproduction rate.