I used to own one of these for quite a long time. Hardy plant, likes dry periods in winter, somewhat less prone to pests and disease, less likely etiolate even in semi-shade. Maybe one of my longest living plants.
When young, it closely resembles pachycereus marginatus. Main differences between the 2 are the spine color, dumortieri 's spines being yellow as opposed to gray and black, the stem texture on dumortieri being glossy as opposed to p.marginatus' being a bit grainy/rough as well as the latter possessing a bit plumper ribs .
Older plants should differ greatly, as s.dumortieri has a saguaro like habitat whereas p.marginatus is smaller and branches basally.

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Large, tree-like, blue-green candelabra cactus from south-central Mexico with greenish white, apical, nocturnal flowers that stay open into the day. Stems 2-6 inches in diameter with 5-8 ribs; 1-4 central spines; and 6-9+ radial spines. Monotypic genus. Sort of looks like Pachycereus weberi. This species was historically a member of Cereus and Stenocereus, though floral characteristics distinguish it from the latter. Older specimens in nature can be downright imposing. The name comes from the way isolated individuals tend to occur in habitat.

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