Abstract: An apparatus for grinding and mulching landscape debris includes a plurality of cylindrical chambers of different sizes. A first intake chamber has an opening through which the landscape debris is inducted into the apparatus. A second, larger diameter cutting chamber is connected to and is concentric with the intake chamber. A plurality of cutting blades chop the landscape debris which is present in the cutting chamber. A third, still larger hammer chamber is connected to and is concentric with said cutting chamber. The hammer chamber includes a plurality of free-swinging hammers which grind the landscape debris to a size which can exit through a perforated grinding ring which surrounds the hammer chamber. A blower chamber surrounds the perforated grinding ring, the blower chamber including a plurality of rotating fan blades which force air out of an exit opening in the blower chamber, thus creating a partial vacuum in the hammer chamber.