DETHATCHING
Dethatching consists in removing thatch accumulation from the base of the grass in order to allow moisture, sunlight, and fertilizers to better penetrate the soil. Thatch comprises dead and un-decomposed grass roots and stems. Thatch plus other small debris stuck above the soil can create a barrier precluding the absorption of nutrients by your lawn. It can also shelter insects and promote disease.
Thatch build-up is a normal process for lawns, but its excess must be prevented. It is easy to detect it by simply using your fingers to move apart your grass and see how much dead grass has amassed before you reach the soil. If you have more than ½ inch, your thatch cover is inhibiting your lawn from looking its best.
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