What is thatch? Thatch is the dead plant material at the base of your lawn. Poweraking or "Dethatching" removes this material for a beautiful healthy lawn. Core aeration, a process of removing finger sized plugs of thatch and soil and depositing them on the surface of the lawn to break down, often will cure mild thatch problems. Aerification allows air and nutrients to the roots of the grass plants. This process reduces compaction and is an important part of lawn maintenance. Dethatching and Core Aeration are availible as part of our full service maintenance program, or as a one time service.