Pachycereus schottii f. monstrosus

A smooth, spineless mutation of the senita prized for its surreal, totem-like sculptural columns.
Frost sensitive, hardy to about 28-30°F, USDA 9-11; a tender low-desert plant needing frost protection.
AMWUA Notes
Spineless, drought tolerant sculptural cactus that thrives on very little water.
Water established plants monthly in summer only; the smooth stems rot if kept wet, so ensure sharp drainage.
Remove damaged stems; sections can be re-rooted to propagate this prized spineless form.
Light spring feeding optional.
Generally trouble-free; watch for mealybugs in the folds.
Frost-tender below 28-30°F; protect during cold snaps and shield from sudden intense sun to avoid scald on the smooth skin.
Fast-draining decomposed granite or gritty mineral soil; low organic matter
Needs sharp, fast-draining soil.
Low feeder.
Stem sections re-rooted after callusing
6-10 ft
Shallow, non-invasive roots; spineless, so safe near pools and patios
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Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.