Catnip
Best known as a stimulant for cats, catnip (Nepeta cataria) is a perennial herb in the mint family (Labiatae) native to Europe. The plant can grow up to three feet tall with white purple spotted flowers on the ends of its branches.
Cats, both domestic and wild, are attracted to catnip due to a mildly hallucinogenic chemical compound known as nepetalactone present in plant tissues. While it has no affect humans, the chemical affects cats to varying degrees, with some having an aggressive reaction.
Chemists explain why catnip make most cats go crazy, and why kitty litter clumps.
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