Trichocereus knuthianus | Live plant

Knuthianus is a rarer Peruvian cactus, which we’re glad to offer here! Live plant.

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Trichocereus knuthianus | Live plant

(syn. Azureocereus deflexispinus, Cereus deflexispinus, Cereus knuthianus, Echinopsis knuthiana, Trichocereus crassiarboreus, Trichocereus cuzcoensis v. knuthianus, Trichocereus peruvianus v. Tarma, Trichocereus tarmaensis)

It took us a while, but we’re very thankful to finally have the harder-to-find Peruvian cactus species Trichocereus knuthianus in our collection! Available from our shop as live, well-rooted plants.

Closely related to Trichocereus cuzcoensis and Trichocereus peruvianus, knuthianus is a glaucous, blueish-green columnar species which reaches to approximately three metres tall, turning progressively more tree-like as it matures. Slightly more knobbly than most other Trichocereus species, its spines range from yellow to whitish-grey, while its flowers are large and coloured white-to-whitish. Apparently,  these plants are known to form intermediates with similar species, such as Trichocereus schoenii and Trichocereus tarmaensis.

This rare cactus species is synonymous with Azureocereus deflexispinus, Cereus deflexispinus, Cereus knuthianus, Echinopsis knuthiana, Trichocereus crassiarboreus, Trichocereus cuzcoensis var. knuthianus, Trichocereus peruvianus var. Tarma and Trichocereus tarmaensis. It was first discovered and described by Curt Backeberg, on the upper course of the Rio Marañon (Peru’s second-longest river and the principal source of the Amazon river), which starts roughly one-hundred-and-sixty kilometres / one-hundred miles to the northeast of Lima, in Peru’s Tarma Province. However, it’s since been observed as fairly widespread throughout the region, with populations appearing in multiple locations in Tarma and its neighbouring provinces. Backeberg named the species in honour of his co-author for ‘Kaktus ABC’, Graf F. M. Knuth.

Apparently, much of this fantastic species in cultivation today derives from cactus collector Friedrich Ritter’s original ‘FR567’ seed collection (also sold as ‘FR677’ and Trichocereus knuthianus f. pachanoi). More recently, American nursery Sacred Succulents has distributed their own clone, as ‘SS03’ (along with Trichocereus peruvianus ‘SS01’ and Trichocereus bridgesii ‘SS02’, which we also offer here in the shop).

We’ve found this cactus species to be quite easy to cultivate in mainland Europe – unsurprising, considering its proximity to such plants as Trichocereus peruvianus. Provide a well-drained, mildly alkaline to mildly acidic soil mix (we use half/half soil and perlite in our nursery), water whenever the top layer of soil becomes completely dry and lightly fertilise two-to-three times per year. Tail off watering and stop fertilising over the winter months and avoid frosts!



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Live plant

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1 rooted plant

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