Do you want to keep your cats from eating potentially harmful houseplants, or coarse, outdoor grass that sticks to the back of their tongues and might contain pesticides? Because it's grown indoors, fibrous cat grass can be served fresh, year-round to assist your cat with digestion, and may help prevent furballs. Grass is ready for cats to eat when it is 2"-4" high; place near their water or food bowl for only a few minutes so that they don't binge. Feed for a few minutes at a time on a regular basis to get your kitty's tummy used to it, allowing absorption of all the nutrients. Great for dogs, too!