Acanthocereus tetragonus: How to Grow and Care for Fairy Castle Cactus

Acanthocereus tetragonus Fairy Castle Cactus

Scientific name: Acanthocereus tetragonus

Common name: Fairy Castle Cactus

The miniature columnar cactus has hundreds of green branches. The turrets of a fairy castle are formed by the branches clumping together vertically. It is perfect for beginners and grows well indoors. Although it rarely blooms and can take years before it is mature enough to do so,Fairy Castle Cactus can produce white or yellow flowers.

Quick Look at Acanthocereus tetragonus

  • Partial sun to partial shade
  • Typical water needs for a succulent
  • Plant grows up to 6′ (1.8 m) tall
  • Zone 10a (Minimum 30° F | -1.1° C)
  • Not cold hardy
  • Propagation by stem cuttings and seeds
  • Generally non-toxic
  • Actively grows in Spring and Fall

General Care for Acanthocereus tetragonus “Fairy Castle Cactus”

Acanthocereus is a wonderful plant for beginners. It grows well indoors. The name Acanthto comes from the Greek word akantha meaning “thorn,” which is good to remember when handling this cactus.


Acanthocereus is known for its watering needs for cacti. The “soak and dry” method will allow the soil to dry out completely between waterings. During winter, water is less frequent.

Where to Plant

If you live in a zone that gets colder than 30 F (- 1.1 C), it’s best to plant the cacti in a container that can be brought indoors. It does well in partial shade.

Additional information

There are many different opinions on how to refer to the castle. It is thought to be a dwarf version of Acanthocereus, or a mostrous form.

How to Propagate Acanthocereus tetragonus “Fairy Castle Cactus”

Stems and seeds can be used to grow Acanthocereus tetragonus “Fairy Castle Cactus”, although you may experience the best success with seeds.


Use a sterile, sharp knife or pair of scissors to grow fairy castle cacti. Allow the main plant’s stem to callous for several days before placing it on well-draining soil. Water whenever the soil has dried out.


It’s not recommended to grow the fruit from the seeds as it’s such a slow grower. You can sow your seeds in well-draining soil. If you live in a zone above 9a, you can grow cacti outdoors. If you live in a cooler area, you can sow indoors under a grow light or on a seed mat.


  1. Acanthocereus tetragonus (Fairy Castle Cactus) – Wikipedia

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