Euphorbia jansenvillensis is native to the mountainous calcareous terrains of South Africa, found at elevations between 800 and 1200 meters. It exhibits a shrubby, segmented succulent branching habit and is a polycarpic species, notable for its compact ramified structure uncommon in the genus. Cylindrical segmented stems 3–5 cm diameter, arranged compactly; epidermis green-gray with whitish speckles; seasonal color shifts toward bronze during winter months.
Place in full direct sunlight; water exclusively in spring and summer, avoiding waterlogging; substrate with minimum 70% mineral content ensuring drainage; minimum temperature 8°C; highly susceptible to root rot under excessive moisture.