How to Propagate Acanthocereus tetragonus “Fairy Castle Cactus”
Acanthocereus tetragonus “Fairy Castle Cactus” can be propagated from stem cuttings or seeds, although you may experience the best success with stem cuttings.
To grow “Fairy Castle Cactus” from cuttings, use a sterile, sharp knife or pair of scissors. Remove a stem from the main plant, and allow it to callous for several days before placing on well-draining soil. Water whenever the soil has dried out completely.
“Fairy Castle Cactus” can be propagated from the seeds of its fruit, although this is not recommended as it's such a slow grower. Sow your seeds in a well-draining soil. You can grow “Fairy Castle Cactus” seeds outdoors if you live in an zone above 9a. If you live in a cooler area, you can begin sowing indoors under a grow light or on a seed mat.
There are many differing opinions on how “Fairy Castle Cactus” should be named and classified. It is thought to be a dwarf version of Cereus hildmannianus uruguayanus, or a mostrous form of Acanthocereus tetragonus.