Known as the “Ganja Guru,” Ed Rosenthal is an international authority on cannabis horticulture, a longtime educator, activist and legalization pioneer. He was an early contributor to High Times magazine and is a professor at Oaksterdam University in Oakland, California.
Rosenthal is the author of several foundational cannabis books, including the influential Marijuana Grower’s Handbook, which since 1978 has taught millions how to grow better weed. In 2002, Rosenthal was prosecuted for growing marijuana, a case that helped sway public opinion in favor of state-level medical cannabis laws. He continues to advocate for cannabis reform worldwide.
‘Everyone Should Have the Right to Grow Their Own Marijuana’
Rosenthal has spent more than 50 years fighting for home cultivation. While some U.S. states have legalized purchase and use, he notes, growing cannabis remains prohibited in many places—like Washington state, where consumers can buy but not cultivate at home. “It’s an incomplete revolution,” he says. “We still have a lot of rights to win.”
For Rosenthal, home grow is about more than access—it’s about pleasure, health and justice. “Growing a plant is a pleasure,” he says. “When we grow, we know what we’re consuming, and we can avoid pesticides and other contaminants.”
Photo by Christian Peacock
He adds that home growing is more affordable and empowering than purchasing from licensed retailers. “It’s much cheaper—and more accessible—to grow cannabis naturally than to go out and buy it.”
“Marijuana use may not be addictive,” he jokes, “but growing it is.” For Rosenthal, the appeal is partly emotional. “Cannabis has stages of growth like a human being. There’s something deeply satisfying in nurturing a living plant.”
From Counterculture to Commodity
Rosenthal has watched cannabis shift from a revolutionary symbol to a commercial good. “The meaning of marijuana has …
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Author: Nicolás José Rodriguez / High Times
