Thatch is a brown spongy organic layer just above the soil surface made of both dead and living grass roots.  Improper lawn management practices contribute to thatch.  A thick thatch layer contributes poor lawn health in all seasons and slows nutrient uptake.  Grass clippings do not contribute to thatch build up.  A light, shallow power raking, used properly, will unmat turf and allow air to the root zone.
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