Blue Candle (Myrtillocactus geometrizans): A Geometric, Blue-Green Candelabra Cactus

Blue Candle, also called Whortleberry Cactus or Cactus Myrtle, is a large, branching, candelabra-form cactus with distinctively geometric, blue-green stems that have 5–6 prominent ribs. It can form a tree-like structure 15–20 feet tall. Small, greenish-white flowers appear along the ribs in spring, followed by edible, dark purple berries (whortleberries) that are sweet and juicy. Native to central Mexico, it’s widely cultivated for its fruit and striking form.

Taxonomic Profile

Growing Conditions

Full sun. Well-drained soil. Drought-tolerant. Hardy to 25°F (-4°C). The berries are edible and attract birds. Used as a rootstock for grafting other cacti. Fast-growing; prune to shape. Sap can irritate.