Foot traffic, mowing and watering can cause soil compaction and even thatch build-up. When soil is compacted, your grass will have difficulty growing a deep root system. Compacted soil also prevents grass roots from getting adequate water, fertilizer and nutrients. Core aeration softens the soil and creates pockets in the soil to help deliver air, water, fertilizer and nutrients to the turf roots. Aeration also helps thatch build-up and promotes a healthy, vigorous lawn and root system.
Annual aeration is beneficial for all lawns. Lawns growing on heavy clay or subsoil, and lawns exposed to intense use should consider two or more aerations each year. Spring and fall are ideal times to aerate.
Over seeding at the time of Aeration is a great way to thicken up a thin lawn or introduce better grass types to a lawn.
Simply spreading grass seed over a lawn will give very poor results. By aerating first, the soil is cultivated, greatly improving the results. The majority of the new grass will grow in the aeration holes. 'Tufts' of new grass will grow out of the holes and then 'tiller-out' and thicken up the lawn.