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Acanthocereus Tetragonus ‘Triangle Cactus’

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Acanthocereus Tetragonus, ‘Triangle Cactus’ or ‘Fairy Castle Cactus’ is a popular indoor cactus that easily adds a sculptural element wherever you place it. Known for it’s ease of care and unique growth pattern, these are great for beginners! They also make a good addition to a desk garden since they don’t require much attention

They’re slow to grow, so don’t expect too much out of them, however try rotating it a few degrees every week. This plants growth is unpredictable enough that from different angles it can feel like a completely new plant! 

Ed's Plant Profile

  • Botanical Name: Acanthocereus Tetragonus
  • Pronunciation: [a-kaen-tha-sear-as tet-ra-gau-nus]
  • Common Name(s): Triangle Cactus, Fairy Castle Cactus
  • Family: Cactaceae
  • Native Range: Florida & Texas, Mexico & Central America 

Ed's Care Guide

  • Care Level: Easy
  • Light: Prefers bright light to encourage blooms, but can adapt to low light conditions
  • Water: Water when soil is dry. Avoid overwatering 
  • Humidity: Average
  • Temperature: 60-70F
  • Pruning: Prune as needed to remove brown or dead leaves
  • Feeding: Cactus fertilizer during the Summer
  • Propagation: Cuttings
  • Growth: Tall, clumping
  • Pests: Uncommon
  • Toxicity: Non-toxic to humans to pets