Acanthocereus tetragonus (Fairy Castle Cactus)

Botanical Name: Acanthocereus tetragonus
Common Name: Fairy Castle Cactus

Acanthocereus tetragonus is a fast-growing, columnar cactus native to Mexico, Central America, and the Caribbean. Commonly known as Fairy Castle Cactus, it features upright, branching stems that form a castle-like silhouette as it matures. This low-maintenance cactus is well-suited for containers, indoor growing, and warm outdoor climates. Mature plants can reach 6–10 feet tall and 3–6 feet wide when grown in the ground, with container-grown specimens remaining smaller.

Care and Cultivation:

• Prefers bright light to full sun

• Water sparingly; allow soil to dry between waterings

• Use a fast-draining cactus soil mix

• Ideal for containers and indoor or patio growing

Frost Tolerance and Cold Hardiness:

• Best suited for USDA Zones 9–11

• Not frost-tolerant

• Protect from temperatures below 32°F (0°C)

Winter Dormancy and Health:

• Growth slows in cooler months

• Reduce watering in winter

• Maintain bright light year-round

Notes:

• Upright growth with architectural form

• Easy to grow and beginner-friendly