Make better use of your time with this water-wicking humidity tray for your precious seedlings and houseplants. Fill the tray once and the capillary mat will keep soil evenly moist for up to two weeks. For seedlings or houseplants. Great for when you're home or away. Polypropylene, polystyrene, fabric. Holds 7 quarts. 22.5" L x 15.25" W x 2" H.