Cat grass

Cat grass is the colloquial term for trays or pots of young cereal grasses, most commonly wheat (Triticum aestivum), barley (Hordeum vulgare), oat (Avena sativa), and sometimes rye (Secale cereale), that are grown indoors for cats to chew. Catnip (Nepeta cataria) and other iridoid-rich plants are usually not included in the term, as they primarily elicit rubbing and rolling behavior rather than ingestion.

The most common stated benefit of cat grass for the pet is to aid the passing of hairballs.