Learning about cannabis with Ed Rosenthal


There are very few people who have been compared to both a superstar homemaker and kitschy advice columnist, but Ed Rosenthal — aka the Guru of Ganga — is that person. According to the NY Times, “Mr. Rosenthal is the pothead’s answer to Ann Landers, Judge Judy, Martha Stewart, and the Burpee Garden Wizard all in one.” 

Over Rosenthal’s 35-year career in the cannabis world, he has been an educator, writer, researcher, culture expert and activist, and is continuing to leave his mark on the ever-growing industry to this day.

Widely considered to be the world’s leading expert on marijuana cultivation, Rosenthal boasts a large body of written work including Marijuana Grower’s Handbook, The Big Book of Bud, Beyond Buds, Closet Cultivator and his long-running column, Ask Ed™, which ran in High Times Magazine for many years. 

And of course, he continues to be a horticulture expert for cannabis training programs like those at  Oaksterdam University and


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