Catnip has been a popular stimulant for cats for a long time. Over the years, it has been found to illicit intensely pleasurable reactions in most, but not all, cats. Catnip is native to Europe but grows as a weed in some parts of the Midwest U.S. and Canada, and is a member of the mint family. The active ingredient is nepetalactone, derived from the volatile oils which can be extracted from the plant. Catnip