Abstract: A method for mechanically processing or straightening a boundary line of a groundcover of grass, turf, garden plantings, forest, or the like adjacent to a utility area, including executing a cutting movement along the edge area of the groundcover to separate the groundcover from the utility area along the boundary line. For this purpose, a rotating, motor-driven, more-or-less circular separating disk, which penetrates into the edge area of the groundcover of grass, etc. along a certain boundary line, and which is set at an acute angle to the forward travel direction, is mounted on a support frame of a self-propelled work machine.