Abstract: A mulcher-chopper of the type in which a horizontally disposed blade is mounted on a driven vertical shaft within a comminuting chamber. The blade is provided with deep and sharp serrations, thereby increasing the effective blade length and enhancing efficiency. Desirably the blade is oriented at an angle so that rotation provides a downdraft that helps move material into the comminuting chamber. A rigid bar, or anvil, extends diametrically across the comminuting chamber, and the blade is juxtaposed thereto, thus providing a highly effective shearing action.