We designed our Self Watering Cat Grass kit for our own cats, with their health and happiness in mind. Hands down, this is our easiest-to-use cat grass system for a plant-and-go approach. Grow your own pet grass on any countertop or windowsill without worrying about constant watering. Our self-watering tray wicking system automatically keeps soil at the ideal moisture level. Includes enough coco coir soil (OMRI approved for organic use) and cat grass for three plantings. Our OTCO certified organic cat grass is a healthy blend of hard red wheat (wheatgrass), oats (oatgrass) & rye (ryegrass).