Fiona, the Fairy Castle Cactus

Acanthocereus tetragonus
Live Plants ship on Mondays & Tuesdays only.


In stock

SKU: FCC.0533 Category:

Meet Fiona! She is perpetually constructing her dream castle with soaring turrets and spires. Be careful though as her walls are covered with finger-pricking spines to keep away dragons. While Fiona might be rooted in reality, she’s still susceptible to romance. If you sit with her in the brightest sun, after some typical get-to-know-you conversation, she’ll take a moment to tell you a tale. Once upon a time…

We recommend planting this plug in our Cactus & Succulent soil.

This plant ships as a 1″ fully rooted starter plant, as shown in the second photo. It will come wrapped in moss and tucked in a growers pot for safety. The terra cotta pot with the mature plant, shown in the first photo, is not included.
If you order multiple plants, we put them together in one pot so they stay moist and insulated. If you think we haven’t sent the full order, please take out the plants from the pot first to count them.

Plant Vitals

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Foliage Color
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Mature Plant Height
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Mature Plant Spread
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Container Size
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USDA Hardiness Zone
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Ft. Collins is Zone 5
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Light Requirement
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Water Requirement
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Suggested Uses


  • Botanical name: Acanthocereus tetragonus
  • Bright light with some direct sun.
  • Allow the soil to dry out completely before watering again. Overwatering is the most common cause of issues with this cactus.
  • Mildly toxic to pets.
  • Skill Level: Beginner