The Fairy Castle Cactus 4in (Acanthocereus tetragonus) is a charming and unique succulent that resembles a tiny castle with its spine-like stems. This cactus grows slowly, with branches that form delicate, turret-like shapes reminiscent of fairy tale castles. Ideal for beginner gardeners, the Fairy Castle Cactus is easy to care for indoors, offering all the enchanting allure of its namesake with minimal maintenance.