Abstract: A container for a growing media, e.g. compost, is disclosed as for use in the production of mushrooms. A plurality of individual container sections with the upper end open, having a depth generally in excess of 20 inches and a width under 16 inches, are affixed together in critically spaced-apart relationship to hold quantities of media. A peripheral, confining wall is provided above the container sections for supporting a common layer defining a continuous bed surface. As disclosed, the structure is fabricated of steel-wire mesh affixed to a frame of beam and column supports, and is lined, as with plastic film. Also as disclosed, a plurality of bed structures are affixed in stacked, spaced-apart tray configurations, for economy of space and handling.