Abstract: A grass catcher for receiving grass clippings and leaves from a rotary deck mower towed by a tractor. A fan driven by the mower forces the clippings through a flexible hose leading to a large capacity hopper. The hopper is mounted on a carriage having a single wheel. A parallel arm linkage permits the hopper to float up and down independently of the mower. When the rope is pulled from the tractor seat, the hopper is dumped to unload its contents. A rear door on the hopper is automatically opened when the hopper is dumped and is closed when the hopper is returned to its running position by pulling on another rope from the tractor seat.