Acanthocereus tetragonus, Acanthocereus pentagonus

Acanthocereus tetragonus is a tall, columnar cactus that reaches a height of 2-7 m. Flowers are open from midnight until dawn, attracting hummingbird moths.

Acanthocereus tetragonus 'Fairy Castles' is a dwarf, columnar, branching, slow growing cactus. The Fairy Castles Cactus is the colorful name by which the plant is marketed and refers to the numerous vertical stems of different heights that resemble spires and turrets.