Abstract: A seedling growth-enhancing device is disclosed, consisting of a circular tube formed from flexible, non-opaque thermoplastic material having a slit formed over its length. The tube is of sufficient size as to substantially enclose the seedling, and the plastic material is inherently resilient so that the device is normally biased into its tubular configuration. The opposed edges of the slit are fastened at the top and bottom to permit the edges to be resiliently spread at an intermediate point to permit access to the seedling for maintenance. Also disclosed are an H-clip for releasably fastening the opposed edges and a wire hanger for suspending the circular tube from an overhead suspension wire.