Abstract: A submersible raft is disclosed for the cultivation of plant life such as seagrasses or the like. The submersible raft includes a first and a second longitudinal member of tubular configuration. The first and the second longitudinal members each have a first and a second end. A first transverse member extends between the first ends of the first and the second longitudinal members and a second transverse member extends between the second ends of the first and the second longitudinal members. The first and second longitudinal members and the first and second transverse members define a rectangular aperture therebetween. Tray supporting cradles extend between and are supported by the first and the second longitudinal members, the trays being supported below the rectangular aperture such that in use of the raft, pots of plant life to be cultivated are supported below the surface of the water in which the raft is submersed.