Dethatching a lawn is the process of removing the thick layer of dead grass, roots, and organic debris (thatch) that builds up between the soil and the green grass, allowing water, air, and nutrients to reach the roots, promoting a healthier, thicker lawn. done with a power rake when the thatch layer exceeds 1/2 inch, preventing pests and diseases and improving overall grass vitality, though it makes the lawn look thin temporarily.
