In addition to being the founder and executive director of the American Botanical Council (ABC) as well as editor and publisher of the quarterly journal HerbalGram, Mark Blumenthal has dedicated most of his life to being a vegetarian. In another installment in our series on herbal medicine, Blumenthal discusses sustaining life on the planet, his history with herbal medicinals, and the evolution of medicinal herbs: “Plant chemistry is not static. It’s a dynamic interaction with the environment.”