Thatch is a layer of dead plant material near the soil surface; examples are roots, grass and leaves.
Thatch strangles new plant growth.
Thatch buildup can prevent fertilizers from mixing with soil and water from being soaked up by the soil.
Dethatching your lawn helps to protect against future lawn problems, such as disease and insect infestations.
Dethatching also helps protect against damage from summer droughts; it allows water to circulate down into your lawn instead of evaporating at the surface.
Aerating your lawn has a lot of benefits and it is crucial to maintaining a healthy lawn.
Aerating loosens compacted soil by pulling out small plugs of soil 3”-5” deep and depositing them on the surface to decompose back into the soil. Loosened soil allows root systems to penetrate more deeply into the soil and become stronger and more resilient in fighting off disease and drought.
Overseeding after aerating is an opportune time; it will produce excellent seed germination by allowing the seeds to fall into the holes where they will grow.