A Technical Report from The Bartlett Tree Research Laboratories 269
There are good reasons for using mulch and it is valued for some very real benefits to the landscape. Mulch is used to control weeds, conserve moisture, increase water permeability, reduce run off and moderate soil temperatures. It also serves to protect the plant stem from string trimmers and mowers adding distance from mechanical injury. It can be attractive too, creating a clean line and separating plantings from the landscape.