Compacted soil results in a less vigorous lawn and microbial activity is inhibited. Thatch increases, so does the chance of diseases. Compaction can also increase soil temperature. Core Aeration is the process of removing core plugs to encourage deep roots; increase air in the soil; improve water and nutrient penetration, along with breaking down thatch. Aeration also encourages the growth of beneficial soil microorganisms.
Dawson’s Landscaping LLC recommends core aeration during the grass’s peak growth period which is either late summer or early fall. In the case of lawns with heavy clay soils, or exposed to heavy traffic, aeration should be down twice a year, once in the spring and again in the fall.