This is one of the best and most fundamental lawn treatments available to stimulate the healthy growth of your lawn. An aerator machine makes finger sized holes in your yard and deposits the plugs on the surface for breakdown. It opens the pores of compacted soils and reduces unhealthy thatch buildup. Compaction and thatch are the primary obstacles that keep nutrients, water, and air from reaching the root structure. As the plugs break down it helps to decompose the thatch. It is recommended that aeration be done annually in the fall.