Botanical Name: Gymnocalycium damsii var. rotundulum (formerly Gymnocalycium rotundulum)
Common Names: Chin Cactus, Round Gymnocalycium
Gymnocalycium damsii var. rotundulum is a compact, easy-to-grow globular cactus prized for its manageable size, subtle coloration, and notable cold tolerance when kept dry. Native to South America, it naturally grows nestled beneath low shrubs in relatively protected, slightly damp habitats. This species remains small and attractive, reaching a mature size of about 4 inches (10 cm) tall and up to 6 inches (15 cm) wide, making it ideal for windowsills, small pots, and cactus collections.
Care and Cultivation:
• Bright light to partial sun
• Well-draining cactus or succulent soil
• Water during the growing season only after soil is completely dry
• Low-maintenance and beginner-friendly
Frost Tolerance and Cold Hardiness:
• More cold-tolerant than many cacti
• Can tolerate temperatures down to ~23°F (-5°C)
• Must be kept completely dry during cold conditions
• Prolonged cold or dampness can cause damage
Winter Dormancy and Health:
• Summer-growing cactus with winter dormancy
• Reduce watering significantly or stop entirely in winter
• Dry winter conditions improve cold tolerance
• Resume watering in spring when active growth returns
Botanical Name: Gymnocalycium damsii var. rotundulum (formerly Gymnocalycium rotundulum)
Common Names: Chin Cactus, Round Gymnocalycium
Gymnocalycium damsii var. rotundulum is a compact, easy-to-grow globular cactus prized for its manageable size, subtle coloration, and notable cold tolerance when kept dry. Native to South America, it naturally grows nestled beneath low shrubs in relatively protected, slightly damp habitats. This species remains small and attractive, reaching a mature size of about 4 inches (10 cm) tall and up to 6 inches (15 cm) wide, making it ideal for windowsills, small pots, and cactus collections.
Care and Cultivation:
• Bright light to partial sun
• Well-draining cactus or succulent soil
• Water during the growing season only after soil is completely dry
• Low-maintenance and beginner-friendly
Frost Tolerance and Cold Hardiness:
• More cold-tolerant than many cacti
• Can tolerate temperatures down to ~23°F (-5°C)
• Must be kept completely dry during cold conditions
• Prolonged cold or dampness can cause damage
Winter Dormancy and Health:
• Summer-growing cactus with winter dormancy
• Reduce watering significantly or stop entirely in winter
• Dry winter conditions improve cold tolerance
• Resume watering in spring when active growth returns
