The Greenhouse Cover for TruDrop Nest Self Watering Planter by Crescent Garden turns your Nest planter into a greenhouse. Extend the growing season or get a start on a new arrangement by insulating your plants from pests and harsh weather, while still allowing ample height and sunlight in for growth. Fitting over two Nest Trellises, which must be purchased separately, the durable reinforced PVC of this cover features two zippers for easy access to your gardening and a Steel rod for support between the trellises.