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Pachycereus marginatus – Mexican Fence Post Cactus


Scientific Name

Pachycereus marginatus (DC.) Britton & Rose

Common Names

Mexican Fence Post Cactus, Fence Post Cactus, Central Mexico Pipe Organ, Organ Pipe Cactus, Mexican Organ Pipe Cactus, Organ Pipe, Organo


Cereus marginatus (basionym)

Scientific Classification

Family: Cactaceae
Subfamily: Cactoideae
Tribe: Pachycereeae
Genus: Pachycereus


Pachycereus marginatus is a cactus with columnar trunks that grow slowly up to 12 feet (3.7 m). Stems are up to 4 inches (10 cm) in diameter, with 5 to 7 ribs. Its central spine is about 0.4 inch (1 cm) in diameter with 5-9 radials and slightly yellowish in colour. Flowers are pink to greenish, up to 2 inches (5 cm) each areole and up to 1.6 inches (4 cm) long. The spiny fruit is yellowish to reddish, 1.6 inches (4 cm) in diameter, and rather dry. The many seeds are black.

Pachycereus marginatus - Mexican Fence Post Cactus

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How to Grow and Care

These extraordinarily low-maintenance plants can basically grow untouched for decades, so there’s really not a lot you need to worry about. Obviously it’s very important that they receive adequate sun and heat, and be careful around their spines. If grown in containers, make sure that they’re 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.

Inapplicable to most scenarios in which Pachycereus would be grown. If you do choose to cultivate a small specimen of Pachycereus pringlei in a container, repotting it can be helpful: if so, repot it as you would any other cactus, by removing it from the pot, cutting away any dead material from the roots, and replanting… – See more at: How to Grow and Care for Pachycereus.


Native to Central Mexico.


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