Abstract: A mower deck including a shroud having a top, a discharge opening, first and second sides, the discharge opening located adjacent the second side and a peripheral skirt defining an open bottom, a plurality of cutting blades mounted to the shroud, each blade on a corresponding vertical drive shaft so as to cut plants and convey the clippings generated thereby from the first side to the second side and through the discharge opening, the drive shaft located closest to the discharge opening being provided with an impeller blade oriented at an angle to the corresponding cutting blade and adapted to direct the flow of cut plants toward the second side and through the discharge opening. The shroud also includes intake ports and a baffle which facilitates the flow of air and clippings from the first side to the second side.