stetsonia coryne This beautiful cactus is one of the most cultivated of all large columnar cacti. They generate very long spines and produce flowers that are white, opening at night and remaining open during the day. Recommended temperature zone: Sunset: 12-13, USDA: 9-11 Frost tolerance: Hardy to 18°F (-8°C) Minimum avg. temperature: 50°F (10°C) Sun […]