Varieties

• Most grass that is sold as "cat grass" is a variety of wheat, oats or bluegrass. According to veterinarian Geoff Stein, actual cat grass is known as Avena Sativa and is more rarely found than the other varieties.
  
  

Why cats eat grass

• According to Vetinfo.com, a cat may eat grass to obtain vitamins lacking in its diet, to help with digestion or regurgitation of hairballs or to cleanse its intestinal tract.
  
  

Plants that are not safe for cats

• Some plants are toxic to cats, according to Vetinfo.com, including chrysanthemums, figs, mistletoe, daffodils, bulb plants, onion plants and rhododendrons.
  
  

Grow your own cat grass.

• Cat grass is easy to grow. The cheapest method is to simply buy seeds and plant in a pot or a patch of ground. Most pet stores sell grass growing kits that you simply water and watch sprout.
  
  

Not catnip

• Cat grass and catnip are not the same, although both are plants. Cat grass is, as the name implies, grass. Catnip is a herb akin to mint and appears to have a temporary and harmless psychotropic effect on cats.