The rotary cutting deck (2) has at least one cutting chamber housing a rotary cutting blade (4). The blade rotates so that grass clippings exit to the rear of the cutting deck through a rearwardly extending exit tunnel (14). A pivotal mulch door (20) is located within the exit tunnel with the mulch door swinging between two positions. In one position, the exit tunnel is open to permit operation of the cutting deck in a discharge/collection mode of operation. In the other position, the exit tunnel is closed to convert the cutting deck to a mulching mode of operation. The mulch door (20) is pivoted for swinging about a substantially horizontal pivot axis located adjacent the front end of the exit tunnel (14).
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