Watch Leaves of Green (2004) : Full Movie Online Free Take a peek inside the world of a hemp growers' cooperative, among other destinations, with this revealing documentary that exposes the history hiding behind the green leaves of the marijuana plant. Covering hemp's medical, industrial and recreational uses -- as well as the bad public image it gained from movies such as Reefer Madness -- this investigative film delves into the facts and myths about the controversial plant.