Native to the dry southeastern Brazilian regions, Cereus azureus inhabits limestone rocky slopes. It is a summer-growing, polycarpic columnar cactus with minimal flowering. Notably, it exhibits a unique bluish-gray epidermal hue uncommon among Cereus species. Cylindrical columnar stems, 3-5 cm diameter, featuring 4-6 prominent ribs and rigid spines 2-3 cm long. Bluish-gray epidermis shifts color intensity depending on sun exposure. Spines arranged alternately along ribs.
Requires at least 6 hours of direct full sun daily. Water every 3 weeks during summer, none in winter. Substrate must contain minimum 70% mineral drainage components. Minimum temperature 7°C; prolonged waterlogging causes root rot.