There are two types of lawn aeration, spike aeration and core aeration.
Spike Aeration puts small holes in the soil from spikes on a drum, the drum is pulled behind a lawn tractor. Core Aeration is the process of removing small plugs or cores from the soil. The plugs are typically a half inch in diameter and 3 to 4 inches long. Both are beneficial to the soil and overall lawn health.
Why you should consider having your lawn aerated
If the lawn’s soil has become compacted, aeration will assist in loosening up the soil. The small holes in the soil will allow better penetration of water, air and nutrients to the grass roots.
If you turf is very thick, aeration will improve the penetration of water, air and nutrients into the soil.
If you’re going to add a Top Dressing to your lawn, the top dressing will settle into the holes and will add beneficial humus to the soil. Humus will retain water longer and as it breaks down, it will add nutrients back into the soil.
If you are planning on over seeding, aerating before will allow the seed to settle in the holes and enhance germination of the seed.
A regular lawn maintenance program should include annual aeration to maintain the soil at optimal conditions for your lawns health. Aeration can be done anytime of the year but is usually best to be carried out in the spring and fall.