A landscape edging machine detachably mounted to the frame of a commercial mower and connection to the power-takeoff shaft to provide rotational power through a drive mechanism to a rotatable cupped disc is disclosed wherein the edging machine is provided with a cupped disc having a serrated edge and being positionally angled with respect to the direction of travel of the machine to facilitate the digging of the soil out of a trench to form a line of demarcation between the grassed lawn area and the adjacent mulched plant bed. The rotatable disc is positioned proximate to the front wheels to permit the disc to easily track along with the mower around curved mulch bed lines. A gauge wheel forms a limit to the depth at which the disc will penetrate the ground. The attachment is pivotally moveable to an inoperative position above the ground.