Native to South Africa, Euphorbia aeruginosa inhabits limestone rocky slopes. It is a polycarpic species with bushy growth, distinguished by quadrangular stems with spiny edges, an unusual trait in the genus due to its persistent blue-green coloration. Quadrangular stems 10-20 cm long, margins bearing spines 5-10 mm, uniform blue-green color with minimal seasonal variation, true leaves absent.
Full direct sunlight exposure; watering limited to active growth in spring-summer; substrate with minimum 70% well-draining mineral content; minimum temperature 5°C; root rot risk from waterlogging.