Ed Rosenthal is recognized worldwide as a leading authority on marijuana. In his more than 40 years as the “Guru of Ganja,” he has written or edited more than a dozen books about marijuana cultivation and social policy that cumulatively have sold more than one million copies. As a result of his studies, he developed Ed Rosenthal’s Zero Tolerance®, a line of pest control products designed to eliminate many garden problems.
Currently Rosenthal consults for commercial growers throughout the world. He is also on the faculty of Oaksterdam University, the leading trade school for the cannabis industry. His classes teach pupils techniques to improve the yield and efficiency of their gardens.