Catgrass gets its name from the fact it's generally only grown indoors in pots to provide kitties something to graze on. There's no proof that grass is essential or helpful to cats' diets, but by offering them their own "gardens" to dine on, they'll be less likely to eat your other houseplants. Place catgrass in a sunny windowsill and water it whenever it begins to dry out. Catgrass will re-sprout after being chewed on. Keep several pots on hand so as one gets nibbled down, you can offer another.