Cat Oat Grass and Cat Wheat Grass are cereal grasses. The oat grass is widely cultivated for its edible seeds. Our popular breakfast oat cereals and wheat cereals are made from the seeds of these plants! The wheat grass is also widely cultivated for its commercially important grain.Athletes and other health conscious people have made juicing the wheat grass very popular. They drink the wheat juice for its high concentrated levels of vitamins and minerals. The vitamins and minerals in the grass improve your cat's overall health.