Tephrocactus geometricus BLACK SPINES is a unique and eye-catching cactus known for its geometric, spherical segments. Each segment is globular, typically bluish-green, and can reach up to 2 inches in diameter. The segments have a smooth surface and are adorned with small, sparse areoles that may produce tiny spines or glochids. This cactus grows in a clumping form, creating an intriguing sculptural appearance. During the spring, it produces beautiful, pale yellow to white flowers, adding to its ornamental value. Tephrocactus geometricus is a hardy plant, well-suited to both indoor and outdoor cultivation in xeric conditions.