Pachycereus pringlei (S. Watson) Britton & Rose
Mexican Giant Cardon, Cardon, Elephant Cactus, False Saguaro Cactus
Cereus pringlei (basionym)
Pachycereus pringlei is the tallest cactus species in the world with a maximum recorded height of 63 feet (19.2 m) and a stout trunk up to 3.3 feet (1 m) in diameter. It bears several erect branches. In overall appearance, it resembles the related Saguaro. Flowers are large, nocturnal, white, and appear along the ribs as opposed to only apices of the stems.
USDA hardiness zones 9a to 11b: from 20 °F (−6.7 °C) to 50 °F (+10 °C).
How to Grow and Care
Like most other plants that can grow to staggering size, Pachycereus cacti grow extraordinarily slowly throughout hundreds of years and require virtually zero assistance on your end, provided they are raised in a desert environment.
These extraordinarily, low-maintenance plants can grow untouched for decades, so there is really not a lot you need to worry about. It is very important that they receive adequate sun and heat, and be careful around their spines. If grown in containers, make sure that they are being repotted and that their soil isn't too moist. Other than that, these plants are about as simple and hands-off as it gets.
Like most cacti and succulents, these plants propagate by cuttings. Sever a branch and replant in well-drained soil. Make sure as well to stand the cactus up in an empty container to let its ends heal off before you replant it; this will keep its stems shaped right, and cacti with dried ends form roots more easily after planting. See more at How to Grow and Care for Pachycereus
Pachycereus pringlei is native to northwestern Mexico in the states of Baja California, Baja California Sur, and Sonora.
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