Various types of lawnmowers are disclosed that include a cutter housing having a cutting chamber and a discharge opening therein. A driving mechanism can be mounted on the cutter housing, and a radius arm can be mounted on or near the blade spindle such that the radius arm is rotatable about the blade spindle. A shutter gate that is arcuate in shape can be mounted on the radius arm so as to rotate with the radius arm between a discharge arrangement and a mulch arrangement. The shutter gate can include a driven element that is driven by the driving mechanism to cause the shutter gate to rotate between the discharge arrangement where the shutter gate allows for discharge of vegetation through the discharge opening, and the mulch arrangement where the shutter gate blocks the discharge opening.
