For many years, professional golf course greens keepers have known that the secret to a beautiful, dense turf is to aerate their course two or three times each year to allow the healthy grass roots to thrive.
This mechanical process is designed to reduce soil compaction, allowing more oxygen and nutrients to get into the root system of the plant. Compaction occurs primarily on the surface of the soil and van range from 1/4in to 1/2in deep, keeping water, nutrients and other crucial factors out of the soil. Aerating machines pull plugs from the turf area, creating large pores that will allow moisture and nutrients to move freely through the soil layers.
Low fertility, combined with summer stresses, diseases and compaction dampens the ability of turf grass to naturally fill-in or thicken. These stresses create many bare areas, some very small and some quite large. The overseeding process thickens the lawn by placing new seed, and ultimately new grass plants into these bare areas.
Benefits to Core Aeration
One or two aerations each year are advised for all lawns on heavy clay soils, those with a moderate to heavy thatch build-up, and any lawn that needs to be "thickened up".
Fills in bare spots to provide a thick, green lawn
Choke out weeds and crabgrass
Loosen and de-compact your soil
Increases root development
Increases water retention
Improves overall plant health