PlantFun
Plant Needs
Sunlight
Full direct sunlight; tolerates intense desert heat, requires no shade for healthy growth
Watering
Water deeply once every 2–4 weeks in growing season; cease all watering during winter dormancy to prevent root rot
Temperature
Thrives in hot arid climates; tolerates brief light frosts down to 5°C but avoid prolonged cold exposure
Characteristics
- Leaf: Modified into sharp, yellowish spines arranged in vertical ribs along the stem
- Flower: White, funnel-shaped night-blooming blooms up to 10 cm long
- Stem: Thick ribbed green column with a rounded apex; grows slowly over decades
Care Guide
Watering
Water deeply once every 2–3 weeks; let soil dry completely between waterings
Fertilization
Diluted cactus fertilizer once every 6 weeks. Use low-nitrogen, high-phosphorus fertilizer to support flowering and stem growth
Eggshell powder top-dress：Grind clean, dried eggshells to fine powder; sprinkle 1–2 tbsp around the base of the cactus; avoid direct contact with the stem to prevent tissue burnPruning
- Remove dead or damaged spine clusters and small stem sections to maintain plant appearance
- Trim off offset pups only if propagating; avoid cutting the main column to prevent permanent damage
- Inspect for mealybug infestations and remove affected areas with a cotton swab dipped in rubbing alcohol
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats; spines may cause physical irritation
Humans: No known toxicity to humans; spines may cause physical injury but no chemical toxicity
Garden Uses & Culture
Culture: N/A
Usage: Ornamental xeriscaping; desert garden focal point; occasionally used in traditional Mexican folk horticulture
