For All Pets :: Easy to Grow :: Just Add Water: Grow organic greens right out of the bag! Pet Greens Garden and Medley are GMO-free seed and soil mixtures in a ready-to-grow bag. Just add water and in about a week, you'll have an all-natural, nutrient-rich treat for your pet! Cereal grasses benefit your pet's health by aiding in digestion for all animals, helping to control hairballs for cats, and providing calcium for reptiles. Birds also love to juice and prune the blades.