Plants, which make thousands of complex molecules, are outstanding chemists. The molecules that plants synthesize often have powerful biological activity and many are used as drugs. For example, vincristine (anti-cancer), taxol (anti-cancer), morphine (anti-pain), and artemisinin (anti-malarial) are all produced by plants. Our research group studies how plants synthesize these molecules and we try to use this knowledge to make these compounds more available and more effective. We study a variety of different plants and molecules. Two recent examples are the anti-cancer agent vinblastine, and the insect repellent (and active ingredient of catnip) nepetalactone.