A plant-growing tray (102) comprises an array of cells (108) for containing stabilised media for propagating plants. The tray comprises a tray top (110), and each cell comprises a base (116) and an inclined side wall (114) extending from the base to the tray top. Each cell is configured to receive a stabilised medium, and comprises a plurality of projections (123), positioned around the side wall and facing into the cell, and a plurality of openings (125) defined in the side wall below the projections. The projections (123) are configured in use to support an upper portion of the stabilised medium. In a further aspect, a plant-growing tray for containing stabilised media for propagating plants is configurable in a nesting configuration with a similar tray, and comprises: a tray base configured to support a base portion of a stabilised medium； a support member, configured to support an upper portion of the stabilised medium； and an inclined tray wall connecting the support member to the tray base.
