Castle Cactus
Scientific Name- Cereus tetragonus About "Castle Cactus" - Some experts classify the cactus as a form of Acanthocereus tetragonus. It has also been given the species name hildmannianus in the genus Cereus. The susbspecies is the real puzzler. Fairy castle cactus is either in the subspecies uruguayanus or monstrose. Whichever scientific name is...