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Trichocereus werdermannianus / Echinopsis werdermanniana

Trichocereus werdermannianus Seeds Samen Echinopsis

Trichocereus werdermannianus, also known as Echinopsis werdermanniana, is a columnar Trichocereus species from Bolivia. It is a close relative of Trichocereus terscheckii and I consider it an intermediate species between the large Andean Trichoereus terscheckii and Trichocereus taquimbalensis.

Original name:

Trichocereus werdermannianus Backeberg & Knuth, Kaktus ABC

Trichocereus werdermannianus is an old name that is debatable because it is so genetically close to Trichocereus terscheckii and might as well be seen as a regional form of it. The plant was discovered and described by Curt Backeberg, who named it after the German Botanist Erich Werdermann.

Trichocereus werdermannianus is a species that is difficult to identify, and its similarity to Trichocereus terscheckii make it difficult to distinguish it from it.

Apart from T.werdermannianus being mislabeled as T. terscheckii, they are also often labeled as Trichocereus taquimbalensis or tacaquirensis. For example, there are a few seed & plant distributors that sell cacti labeled Trichocereus werdermannianus, and the plants we grew from them ended up being all kinds of species. Trichocereus werdermannianus was sold as Trichocereus terscheckii, Trichocereus taquimbalensis, Trichocereus pasacana, Trichocereus peruvianus and Trichocereus macrogonus.

Constant Traits to Identify

A very constant trait in all Trichocereus werdermannianus plants is the dark green to blue gray green color of epidermis, that is very typical for this species. Most if not all specimens I ever saw had a very dark green epidermis and a spination that looks like a mix of Trichocereus taquimbalensis and Trichocereus terscheckii.

I included the Description from Backeberg´s Book below. Backeberg acknowledges Trichocereus werdermannianus´genetic proximity to Trichocereus terscheckii and Trichocereus validus, but mentions that its flowers usually emerge from the top of the plant, while the two species mentioned before would have flowers that appear at lower regions of the plants body. Based on these observations, we think that it should merely count as a form or variety of Trichocereus terscheckii. That is if we even go so far to split a species up based on such criteria.

Flowers of Trichocereus werdermannianus:

White, flowering from the apex, flowers similar to the flowers of E.terscheckii.

The trees reach a size of 5 meters and a maximum diameter of 65 centimeters. Young plants have 10+ ribs while adult specimens can have 14+ ribs. The plant has ten spines that are between 5 and 10 centimeters long, color between yellow and yellowish brown. Many flowers that arise around the apex of the plant. The flowers can get up to 22 centimeters long, but the whole complex is very variable in this regard. The fruit is up to 4 centimeters in diameter and has many white or black hairs.

Trichoecreus werdermannianus seeds

The seeds of this species are usually 1,4 mm large, but that is also influenced by other factors such as region, plants that grow in direct neighborhood.

Origin of E.werdermanniana:

Bolivia, the type location is in the Charcoma Valley east of Tupiza. However, the species is also present around Potosi. Backeberg suspected that Trichocereus taquimbalensis from the region around those aforementioned locations is actually Trichocereus werdermannianus. It is obviously related to Trichocereus taquimbalensis, but there are substantial differences between these two species.

The first Two Pictures are in Fact the plant that Backeberg understood as Trichocereus werdermannianus. Pictures from the unspeakable Thunderhorse! 😉 In Front on the lower left: True validus! Please note that some pics on this page actually show plants labeled Trichocereus werdermannianus, but get very close to Trichocereus taquimbalensis.  It´s probably not that easy to draw a firm line between these two species sometimes.

Trichocereus werdermannianus Echinopsis werdermanniana
Trichocereus werdermannianus Echinopsis werdermanniana 2
Trichocereus werdermannianus Echinopsis werdermanniana Taquimbalensis
Trichocereus werdermannianus Echinopsis werdermanniana 77
Trichocereus werdermannianus Echinopsis werdermanniana KK1094 mutant
KK1094 Trichocereus werdermannianus Mutant

The three pics above show seedlings that were raised from KK1094 Trichocereus werdermannianus seed. Please note that those seedlings actually ended up being Trichocereus taquimbalensis var. wilkae instead
Knize used this number for two plants. First, Trichocereus giganteus and then Trichocereus werdermannianus. Maybe he wasn’t sure about the ID, called it Tr. giganteus and changed it to Tr. werdermannianus later on. Both plants are collected in Otavi, Bolivia. Giganteus at 3200 Meters and Werdermannianus at 3500m.  Pics: MUTANT.

I own a Trichocereus giganteus KK1094, which ended up being a completely typical Trichocereus werdermannianus.

Trichocereus giganteus KK1094 Trichocereus werdermannianus Echinopsis (2)
Trichocereus giganteus KK1094 Trichocereus werdermannianus Echinopsis (2) 2
Trichocereus giganteus KK1094 Trichocereus werdermannianus Echinopsis (3)
Trichocereus giganteus KK1094 Trichocereus werdermannianus Echinopsis (24)

This is Trichocereus Werdermannianus KK917 from Karel Knize. Pic from Rodni Kisar!

Werdermannianus KK917

This One is Trichocereus werdermannianus in the Botanical Garden in Adelaide. Pic from ZED! Thank you Bro! The plant is very close to Trichocereus taquimbalensis.

Trichocereus werdermannianus Echinopsis werdermanniana Adelaide Gus
Trichocereus werdermannianus Echinopsis werdermanniana Adelaide Gus 2
Trichocereus werdermannianus Echinopsis werdermanniana Adelaide Gus 4
Trichocereus werdermannianus Echinopsis werdermanniana Adelaide Gus 6

Orignal description of Curt Backeberg in German:

Trichocereus werdermannianus Backb g. — Backeberg & Knuth, Kaktus-
ABC, 206, 412. 1935
Bis 5 m hoch; Stamm bis 1 m hoch und bis 60 cm ∅; Rippen ca. 10, später 14
und mehr, 2 cm hoch; Areolen 2,5 cm entfernt; St. am Jungtrieb ca. 10, mittlere

kaum unterschieden, bis 7 cm lang, gelblich bis bräunlichgelb bzw. hornfarbig;
Bl., wenn zahlreich vorhanden, ± kranzförmig um den Scheitel oder scheitelnah;
bis 20 cm lang; Gr. weiß, kaum die Staubb. überragend; N. 15—19; Fr. kugelig,
3,5 cm ∅, lange, aber nicht sehr zahlreiche schwarze und weiße Haare tragend;
S. 1,3 mm groß, mützenartig, rauh punktiert. — B o l i v i e n (von mir, als Typort,
im Charcoma-Tal, östlich von Tupiza gefunden, von Cardenas auch in den
trockenen interandinen Tälern der Departements Potosi und Chuquisaca, auf
ca. 2600 m Durchschnittshöhe der Vorkommen) (Abb. 1054—1055). Während Trichocereus validus und T. terscheckii seitlich ± weit herab blühen,
ist T. werdermannianus durch seine nur hochsitzenden Bl. eindeutig unterschieden.
Sie alle scheinen nach den viel längeren Bl. und der sich nie verändernden
Stachelbildung an den Spitzen großer Pflanzen echt trichocereoide Riesenformen
zu sein, die (zum Teil) auch nachts geöffnete Bl. zeigen, wie ich zumindest an zwei
Arten beobachtete.
„Trichocereus pasacana“ dagegen scheint die größten Formen der Helianthocereus-
Formengruppe zu bilden, mit kürzeren Bl., gedrungeneren Röhren und an
alten Exemplaren bzw. solchen an hohen Standorten mit borstenartig elastischen
St., wie sie den Hochlands-Helianthocereus-Arten eigentümlich sind. Ich habe
daher Trichocereus pasacana auch zu Helianthocereus gestellt. Er ist zudem Tagblüher, soweit bekannt.

Trichocereus werdermannianus / Echinopsis werdermanniana 33
Trichocereus werdermannianus
Trichocereus werdermannianus / Echinopsis werdermanniana 55
Trichocereus werdermannianus / Echinopsis werdermanniana Friedrich Ritter
Trichocereus werdermannianus / Echinopsis werdermanniana Pedro
Trichocereus werdermannianus / Echinopsis werdermanniana Pedro 3
Cactus Affinity
Trichocereus werdermannianus / Echinopsis werdermanniana Tricho Nest 2

Check out our main plant database pages for Trichocereus pachanoi aka Echinopsis pachanoi here:

And Trichocereus bridgesii here:

Trichocereus scopulicola

Also check out our Trichocereus Facebook group here:

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Trichocereus taquimbalensis Echinopsis

Trichocereus taquimbalensis is a columnar cactus from Bolivia. It is currently considered a subspecies of the closely related species Trichocereus tacaquirensis.

Current name: Echinopsis tacaquirensis ssp. taquimbalensis

Synonyms: Trichocereus tacaquirensis, Trichocereus werdermannianus, Helianthocereus werdermannianus, Echinopsis taquimbalensis, Echinopsis tacaquirensis, Echinopsis tacaquirensis ssp. taquimbalensis, Echinopsis tacaquirensis ssp. tacaquirensis, Trichocereus taquimbalensis var. wilkae

Trichocereus taquimbalensis Echinopsis

Trichocereus taquimbalensis is a pretty common cactus from Bolivia and can be found in collections throughout the world. There is large confusion around this plant because many of them come mislabeled as Trichocereus Werdermannianus. I have no idea if this confusion is caused by seed collectors or maybe because Backeberg´s Trichocereus Werdermannianus but the fact that Backeberg actually knew Taquimbalensis indicates that his Werdermannianus is rather some kind of Intermediate between Trichocereus terscheckii and Trichocereus taquimbalensis and the root of the error lies in seed collectors not being able to tell the both apart. Please note that Trichocereus werdermannianus has definitely similarity to Trichocereus taquimbalensis so it´s very likely it is related to that species.

Authentic Trichocereus taquimbalensis has a bright green waxy epidermis and a number of rounded spines with a swollen base. They grow up to 2,50 meters tall and reach a diameter of 15 centimeters. Mature specimens have 8-9 Ribs with Areoles that are 1,5 centimeters apart. Areoles are Round to elliptic in shape and stand out up to 1 centimeter. Areoles are also white felted with 8-13 radial spines and up to 2 centimeters tall. One downward pointing middle spine that is up to 7 centimeters long and with thickening knobs at the base. Spines at first bright brown and later gray.

Flower: The flower is up to 23 centimeters long, ovaries 2,2 centimeters in diameter, with white and brown hairs and brown sepals that are up to 10 centimeters long. The Flowers are white. Trichocereus taquimbalensis is a day-flowering species.

Origin: Bolivia, provence Tarata, Department Cochabamba near Taquimbala, 2800 meters.

There is a variety var. WILKAE which was found by some women named Wilkae and it has more rounded spines and have four middle spines. This variety grows around Tupiza, which is a good distance away from the location of the type.

The modern taxonomy combines Trichocereus taquimbalensis and tacaquirensis and calls it Trichocereus tacaquirensis, with which I do not agree. Trichocereus tacaquirensis has a lot more spines, which are needlelike and the plant looks more like a tarijensis than a taquimbalensis. Basically 99% of all the plants labeled as Trichocereus tacaquirensis turned out to be some kind of Trichocereus taquimbalensis. While Trichocereus tacaquirensis is an extremely rare local variety of Tr. taquimbalensisis, the latter is extremely common and if any one of them should be a subspecies, it should definitely be Tr. tacaquirensis.

On google, there is a huge number of plants with the wrong label to be found as well, so every plant labeled tacaquirensis should be regarded with skepticism. So far, I cannot remember coming across Trichocereus tacaquirensis on the open market as a plant. Trichocereus taquimbalensis, on the other hand is very common.

I will now add some pics from backeberg in which he showed the differences between Trichocereus taquimbalensis and tacaquirensis. I agree that they are definitely related but since they are so easy to differentiate, I feel like it´s not legitimate to lump them both together.

If you are interested in some of my seeds, feel free to join my rare Seeds and Plants Newsletter.

Propagation: By seed or cuttings. But I actually had problems rooting this species and most cuttings I took did not survive. But that may only be true for the clone that I had and I heard about other growers having no problems rooting it.

Frost and Winter protection: Trichocereus taquimbalensis is a typical, cold hardy Trichocereus and can tolerate temperatures down to -5° celsius for very short periods of time. But I would absolutely not recommend keeping it at such low temperatures and it always depends on the general constitution of the plant. Besides, it has to be completely dry and  I would recommend to keep it at temps of approximately 10° celius of you overwinter them inside. Wet soil is a killer and should be absolutely avoided.

Cultivation: Trichocereus taquimbalensis does not like full sun and I usually grow them in partial shade. It likes a little bit sun over the course of the day, but it tends to get sunburns pretty easily. If it get´s a severe sunburn, it can die pretty quickly. I only water them when it´s hot and only as much as it can take up within one day. They don’t like wet feet, but that´s something that is valid for most Trichocereus species. I stop watering them around the end of the summer and keep it dry over the winter.

This first Pic shows Trichocereus Tacaquirensis

trichocereus tacaquirensis016

trichocereus tacaquirensis018

 The difference between Trichocereus taquimalensis and Trichocereus tacaquirensis

And this plant is actually a very typical Trichocereus taquimbalensis! I will also add new Pictures to this Gallery too because it is actually a small specimen.

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Terscheckiinot (Peruvianus/Cuzcoensis)

Terscheckiinot (Peruvianus/Cuzcoensis)

This plant is from the breeder Shruman and I lack any substantial Information on the plant. I once got seed but unfortunately, the viability was not great so I did not get any adult plants from it. I would love to know more about it but currently, this pic is the only one I have and if anyone has this clone, please let me know and I´ll add some more pics or a description.

On the first look, I am inclinded to think that it is actually a Trichocereus Werdermannianus, which is most likely related to Trichocereus Taquimbalensis. The more I look at it, the more I think that this plant definitely shares some characteristics with Trichocereus Werdermannianus, such as the pale blue epidermis and the spination. If I see this correctly, its spines have a knobby base and a light touch of red, which would make it even more likely that it´s a Werdermannianus.
Nonetheless, I will keep it as Trichocereus cv. Terscheckiinot because thats the name it was given from Shruman. And I agree it definitely isnt a Trichocereus Terscheckii.

Buy seeds or plants: Just like I mentioned before, the only known source for this plant is Shruman. He sold or traded away seed of it but that was at least 2-3 years ago. Nonetheless, if you are interested in this type, you can make a post in the Trichocereus Facebook Group and maybe someone can help you.  The pic came from Prier and I´ll ask him if he knows more about it.

Trichocereus Terscheckiinot