Self Watering Cat Grass Kit. The Easiest Way to Grow Cat Grass.The easiest, cleanest way to grow fresh cat grass indoors! Keep your furry friend happy and healthy with this self watering, soil free cat grass kitjust water once and watch it sprout in days! Includes a dishwasher safe 12"x6" tray with bamboo surround, biodegradable hemp mat, blackout lid, and USDA organic, non GMO wheatgrass seeds for lush, vibrant growth. No mess, no guessworkjust fresh greens your cat will love. Convenient refill packs available