Core aeration reduces soil compaction and improves uptake of water and fertilizer for a healthier lawn. When soil becomes impacted and hard the roots cannot establish themselves deep into the soil therefore restricting them from obtaining proper nutrition and water thus allowing the grass to become weak and vulnerable to problems.
Core aeration pulls plugs of soil from the lawn usually about 3 to 4 inches deep. This process then allows the soil to loosen and make room for water , fertilizer, and air to get down to the roots more easily thus establishing a stronger, deeper root system for a healthier lawn.
St Augustine, Centepede, Bermuda, and Zoysia grasses should be aerated after spring green up.
For a healthier lawn core aeration should be done once yearly to help reduce thatch and disease.