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Most lawns have areas where the grass dies back just above the ground. Known as thatch, this layer of dead grass is beneficial in small amounts. However, when thatch builds up too quickly, it prevents water and air from reaching the grass, which can cause widespread brown spots. Therefore, it is necessary to dethatch the lawn.
Thatching is a process that removes the inhibiting layer of dead grass for a healthier, greener lawn.
You know it's time to dethatch if more than a half inch of dead grass has built up and begun to weaken the grass. Other signs to look for include thin leaves, pale color, and weak growth. Additionally, if your lawn has a thick layer of thatch, it may feel spongy under your feet.
