Dethatching is the process of removing a layer of dead grass, roots, and other organic material, known as thatch, that accumulates on the soil surface. Thatch can prevent water, nutrients, and air from reaching the soil, which can hinder the growth of healthy grass. Dethatching is typically done using a dethatching rake or a power dethatcher, which pulls up the thatch and allows it to be collected and removed. This practice is most beneficial for lawns that have a thick layer of thatch, usually more than half an inch. Regular dethatching can promote a healthier lawn by improving soil aeration and encouraging new grass growth. It is often recommended to dethatch during the growing season, particularly in the spring or early fall, when grass can recover quickly.