Myrtillocactus geometrizans, commonly known as Bilberry Cactus, is an evergreen succulent native to the arid and semi-arid regions of Mexico. It is characterized by a fast growth rate and can reach heights of 4–5 meters, making it a large, shrubby cactus with a candelabra-like branching pattern on mature plants. The individual stems are 6–10 cm in diameter, with five (occasionally six) ribs and areoles spaced 1.5–3 cm apart. The creamy white flowers, 2–2.5 cm in diameter, bloom in spring and are followed by edible dark purple berries, 1–2 cm in diameter, which resemble Vaccinium myrtillus (bilberry or whortleberry) fruit. This resemblance is the origin of both the scientific and common names.

The Bilberry Cactus is valued for its sculptural form and ease of maintenance, making it a striking addition to xeriscapes, rock gardens, and as a container plant for patios and indoor settings. It is also cultivated for its edible fruit, which is sold in Mexican markets. This cactus thrives in full sun to part shade and requires very little water, making it suitable for drought-tolerant gardens. It prefers well-draining soils and is tolerant of poor soil conditions. While generally disease-free, it can be susceptible to root rot if overwatered. The Bilberry Cactus is not known for being invasive when grown outside its native range, but care should be taken to avoid overwatering to prevent potential root problems.CC BY-SA 4.0