A floating plant propagation tray comprises a tray wall with four sides, 130 to 136, and a tray plate 50 with an upper face 52, a lower face, and a peripheral edge 56 connected to the tray wall. The tray has multiple soil cells connected to the lower surface of the tray plate forming open upper apertures 90 and open lower apertures (94, fig 2). The soil cells, tray wall and tray plate define a tray volume which enables buoyancy by providing a chamber for the compression of air. Preferably, there are primary or secondary bulkheads extending between the walls of the tray, or cell bulkheads extending between a wall and a cell. Preferably the tray is constructed as an integral unit and may be a thermoplastic polymer. Preferably the height of the cells is less than the height of the walls.
