Scarification is a very important task to improve the quality of your lawn and increase the effectiveness of other lawn maintenance procedures. The scarification process removes organic matter, such as thatch or moss, from around the base of the grass plants and tidies up any straggly lateral growth, that will otherwise prevent good dense grass growth. If you do not scarify, debris will build up and lead to other problems. For example, thatchy and mossy lawns will not be very wear or drought tolerant.