Trichocereus pachanoi f. monstrosa | ‘Monstrose San Pedro’ | Live plant


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An absolutely captivating, mutated form of Trichocereus pachanoi, the ‘Monstrose San Pedro’. Rooted plant.

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Trichocereus pachanoi f. monstrosa | ‘Monstrose San Pedro’ | Live plant

(syn. Echinopsis pachanoi f. monstrosa, Trichocereus macrogonus subsp. pachanoi f. monstrosa, Trichocereus macrogonus var. pachanoi f. monstrosa)

Two common monstrose ‘San Pedro’ cultivars exist, commonly known as Trichocereus pachanoi forma monstrosa ‘Clone A’ (also known as ‘Melted Wax’ and ‘Molten Wax’) and Trichocereus pachanoi forma monstrosa ‘Clone B’. Both of these clones can be extremely similar in appearance, causing some collectors to doubt them to be separate forms at all. They can also “stop-start” their monstrose growth, temporarily reverting to a more traditional – yet still slightly wonky – columnar form. Even more confusingly, there are also two monstrose forms of Trichocereus bridgesii (‘Bolivian Torch’) which are also referred to as ‘Clone A’ and ‘Clone B’. Currently, we’re uncertain which of the two forms the ‘Monstrose San Pedro’ listed here best fits, but we can say that they’re some truly lovely plants…

Commonly known as ‘San Pedro’ (and also as ‘Achuma’, ‘Aguacolla’, ‘Giganton’, ‘Hahuacollay’, ‘Huachuma’ and ‘Wachuma’), Trichocereus pachanoi (syn. Echinopsis pachanoi) is a fast-growing columnar cactus found naturally in Argentina, Bolivia, Chile, Ecuador and Peru. A native of the Ecuadorian and Peruvian Andes Mountains, where it prefers an altitude of roughly two thousand to just under three thousand metres, pachanoi has been used by man for over three thousand years. For example, as an ornamental, for religious divination and in traditional medicine (human and animal). It’s closely related to other species such as Trichocereus bridgesii and Trichocereus peruvianus (‘Peruvian Torch’).

Typical forms of the species grow up to six metres tall (although the highest recorded was twelve metres!) under ideal conditions in USDA Zones 8-10. Its stems, usually forming multiple branches from the plants base, grow up to fifteen centimetres in diameter and generally possess six to eight ribs.

Pachanoi’s origins in the Andes enable it to withstand far lower temperatures than can many other cacti and it’s consequently easy to grow indoors and outdoors in most areas. Averaging around twelve inches of new growth per year in an ideal climate, pachanoi can be propagated from seed or cuttings, requiring fertile, free-draining soil and regular watering.

Product Details

Product Type

Live plant


1 rooted plant


~14cm tall

Common Name

Monstrose San Pedro








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