Abstract: A mulching attachment is provided which is adapted to be detachably secured in place within the cavity defined by the deck of a lawn mower in spaced relation to the mower discharge chute opening, so as to permit air flow thereby and to enable virtually unhampered bagging of the leaves picked up by the mower. The mulching attachment comprises a mulching plate which is disposed above the plane of the path of travel of the mower cutting blade, with a portion of the lower edge of the mulching plate being disposed closely adjacent to the upper surface of the cutting blade during rotation of the cutting blade so as to provide a shearing or scissoring cutting action in the area of the lower edge portion. The radial outermost portion of the lower edge of the mulching plate is shaped so as to permit air flow thereby. In one embodiment, a pair of plates are used to form the mulching plate so as to enable the size of the mulching attachment to be adjusted to accommodate mowers of different types and sizes.