There is a big essential difference between catnip and cat grass: catnip can be called a drug in the cat world, while cat grass is beneficial to cats, one for smoking and the other for eating. Catnip is made from a variety of compounds, which can stimulate brain nerves and excite cats; catnip is a plant grown by breeders. After cats eat it, it can help vomit hair in the body and help the gastrointestinal tract. Creeping; breeders should carefully choose for cats based on their functions.