"Dr. Greenthumb" is a song by the American hip-hop group Cypress Hill, featured on their album Cypress Hill III: Temples of Boom. Released in 1995, the track discusses themes related to cannabis culture and the cultivation of marijuana. The song's catchy beat and memorable lyrics contributed to its popularity within the genre. The character of Dr. Greenthumb represents a knowledgeable figure in the world of marijuana cultivation, often associated with the idea of growing high-quality cannabis. The song has become an anthem for fans of stoner culture and is frequently referenced in discussions about hip-hop and its relationship with cannabis.