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The Walking Crow's Guide to Plants and Gardening

The Cathedral Cactus, also known as the African Milk Tree or Friendship Cactus, is a striking succulent with an upright, columnar growth habit and distinctive three-sided stems. While it’s commonly called a cactus, it actually belongs to the Euphorbia genus. Its architectural form and ease of care make it a popular choice for both indoor and outdoor settings.

  • Genus: Euphorbia
  • Species: Euphorbia trigona
  • Growing Zone: Thrives in USDA Hardiness Zones 10-12. In colder regions, it’s grown as a houseplant.
  • Origin: Native to Central Africa.
  • Toxicity: The Cathedral Cactus is considered toxic to humans and pets. It produces a milky sap (latex) that can cause skin irritation, eye problems, and gastrointestinal distress if ingested. Handle with caution and wear gloves when pruning or propagating.
  • Health Benefits: No significant health benefits are associated with the Cathedral Cactus.
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  • Soil: Prefers well-draining soil, such as a cactus or succulent mix. Ensure proper drainage to prevent root rot.
  • Sunlight: Thrives in bright, indirect light or full sun. Can tolerate some shade but may become leggy.
  • Water: Drought-tolerant and prefers infrequent watering. Allow the soil to dry out completely between waterings. Overwatering can lead to root rot.
  • Temperature: Tolerates a wide range of temperatures but prefers warm conditions. Protect from frost.
  • Fertilizer: Light feeder. Fertilize once or twice during the growing season (spring and summer) with a diluted, balanced liquid fertilizer or a specialized succulent fertilizer.
  • Pruning: Prune to shape or control size. Wear gloves when pruning due to the toxic sap.
  • Propagation: Easily propagated from cuttings. Allow the cuttings to dry and callus over before planting in well-draining soil.
  • The Cathedral Cactus is a fast-growing succulent that can reach several feet tall indoors and even taller outdoors.
  • Its stems are typically dark green with prominent ridges and small, reddish-brown spines.
  • It may produce small, yellow flowers in spring or summer, but flowering is rare indoors.
  • The Cathedral Cactus is relatively pest and disease resistant.

In Columbus, Georgia: The Cathedral Cactus can be grown outdoors year-round, enjoying the warm climate and ample sunlight. Provide some afternoon shade during peak summer and protect from frost during occasional winter dips.

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