Native to the Baja California peninsula and parts of the Sonoran Desert. The plants are part of rocky hillsides and alluvial plains where water is rare and temperatures may be extreme.  It is actually a striking cactus with an upright form and imposing columnar height. The plants grow slowly, putting on less than a foot of dimension per year and wild harvest is prohibited due to the protected status of this cactus. Boojums in the wild have been found at 70 to 80 feet in height, but cultivated plants are significantly less at only 10 to 20 feet tall. The trees resemble taper candles with tiny bluish-green leaves that drop off when the plant reaches dormancy. These are cool season plants that do the majority of their growth from October to April and then go dormant in the hotter weather. The main stem is succulent and soft while smaller branches appear perpendicular to the trunk. Flowers are creamy white in clusters on the terminal ends of branches from February through March.