Dethatching is necessary when the thatch layer — the mat of dead grass, roots, and organic debris between the soil and green grass — gets too thick to break down naturally.

The key threshold is ½ inch. A thin layer (¼ to ½ inch) is actually beneficial, acting as a natural mulch that retains moisture and insulates roots. Once it exceeds ½ inch, it starts causing problems.

Signs your lawn needs dethatching:

Lawn feels spongy or bouncy when you walk on it

Grass looks thin and stressed even with regular care

Water beads up and runs off rather than soaking in

You can see a visible brown layer when you pull back the grass

Moss is encroaching (thatch creates conditions moss loves)