Trichocereus pachanoi (San Pedro cactus) is a columnar cactus that grows wildly in Argentina, Bolivia, Chile, Ecuador, and Peru. Trichocereus pachanoi also goes by the alias Echinopsis pachanoi. Mature plants typically reach heights between 10-20 feet tall, but have been recorded to reach heights up to 40 feet. Trichocereus pachanoi produces large white flowers that open at night. San Pedro cactus has long history of ceremonial and ritualistic use. Archeological evidence suggests that Trichocereus pachanoi use may date by back over 2000 years to the Moche culture. This species is also a relative to Trichocereus macrogonus, Trichocereus peruvianus, and Trichocereus bridgesii.