USDA Fact Sheet on Catnip - http://www.sfp.forprod.vt.edu/factsheets/catnip.pdf Information on medicinal properties, non-medicinal uses, natural habitat, cultivation, harvest, storage, processing, marketing, conservation and management of catnip. [PDF format]
Catnip (Nepeta spp.) - http://herbsforhealth.about.com/library/weekly/aa040397.htm Article on types of catnip, reaerch on catnip, and how to grow catnip.
Catnip: Why Do Some Cats Love It and Others Leave It? - http://www.peteducation.com/article.cfm?cls=1&cat=1406&articleid=1131 Discussion of which cats respond to catnip, and how it should be handled for best response.
Catnip Repels Mosquitoes More Effectively Than DEET - http://www.sciencedaily.com/releases/2001/08/010828075659.htm ScienceDaily Magazine - Researchers report that nepetalactone, the essential oil in catnip that gives the plant its characteristic odor, is about ten times more effective at repelling mosquitoes than DEET - the compound used in most commercial insect repellents.
How does catnip work? - http://www.howstuffworks.com/question303.htm How Stuff Works - article on how catnip works, Why it is only for cats, and whether it works on tigers, and leopards.
Catnip - http://www.hort.purdue.edu/newcrop/med-aro/factsheets/CATNIP.html Purdue guide to aromatic and medicinal plants.
What is Catnip? - http://www.provet.co.uk/petfacts/healthtips/catnip.htm ProVet Healthcare article on active ingredients and common effects of catnip.
Catnip - http://www.hdw-inc.com/catnip.htm HDW Enterprises and Foothill Felines Bengals - Article about catnip, the aphrodisiac adored by cats everywhere, but a surprisingly versatile herb as well.