PlantFun
Plant Needs
Sunlight
Full direct sunlight; tolerates partial shade during extreme summer heat to prevent sunscald
Watering
Allow soil to dry completely between waterings; avoid overwatering to prevent root rot, especially in cool months
Temperature
Hardy to mild frost; protect from prolonged temperatures below -5°C; withstands high desert heat up to 38°C
Characteristics
- Stem: Cylindrical, green, with 15–30 prominent ribs lined with closely spaced spines.
- Spines: Radial spines are white/cream, central spines may have pink, red, or brown tips, forming a comb-like (pectinate) arrangement.
- Flower: Bright magenta, pink, or white blooms, 5–8 cm wide, opening during daytime.
Care Guide
Watering
Water thoroughly when soil is completely dry; reduce frequency during extreme heatwaves
Fertilization
Diluted low-nitrogen cactus fertilizer once monthly. Apply fertilizer only to moist soil to avoid root damage
Eggshell powder topdress：Crush clean, dried eggshells into fine powder; sprinkle a thin layer on soil surface to add calcium without burning rootsPruning
- Remove dead or damaged stems at the base to maintain clump health and airflow
- Trim offsets only for propagation; avoid unnecessary cutting of healthy stems
- Clear fallen spines or debris from around the base to prevent pest harborage
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats
Humans: No known toxicity to humans
Garden Uses & Culture
Culture: N/A
Usage: Ornamental cactus for rock gardens, container displays, and xeriscaping
