The expanding coupler for a mower and lawn vacuum may pull a suction hose adjacent to a deck adapter outlet. A plurality of hose springs may allow the suction hose to separate from the deck adapter outlet when the suction hose is pulled. The shroud may direct clippings from the deck adapter outlet to the suction hose when the suction hose is separated from the deck adapter outlet. As a non-limiting example, the suction hose may couple a deck adapter of a lawn vacuum to a suction hose adapter of the lawn vacuum. The suction hose may be pulled when the riding lawn mower makes a turn in a direction that is opposite the side that the suction hose is on. Fasteners may prevent the suction hose from separating from the hose adapter.