Hallo Chris, the plant you show is Pterocactus fischeri and these plants grow forming segments. Nevertheless the slim top of the plant is caused by lack of light. This is no real problem because older stems usually die after a few seasons but new growth is coming from the base as you can see at your...

Hallo,

my wife reminded me that some ptero-fotos of our previous trips are online.
Look here: http://www.pterocactus.de

Nobby

Sorry for not putting a foto now - this has to wait until I'm back from my trip.
Regarding the caudex - pseudocaudex discussion I don't know how the growth would be if the plants were cultivated with the root potted above ground. In nature they never grow that way.

Nobby

Hello, just a few days ago I have been at the location of P. reticulatus and P. gonjianii near Paso Agua Negra in the north of San Juan, Argentina. I knew this location very good and there were no plants to see. We saw the same (no plants) in the last year at well known locations of P. fischeri and ...

Pterocacti like P. tuberosus, P. megliolii and similar only flower on new stems.
It is best to cut all old stems in autum to give all new stems in spring the power of the root.
In nature the old stems die too.
Nobby

Hallo Mike,

looks like P. fischeri/valentinii.
It is not possible to see differences in young plants - and your plant is young.
P. tuberosus should not have hairy areoles.
Nobby

Hi, yes, the seedlings are from our own seed. Sorry, but we have not enough seeds to sell them. There are only few species that are producing enough seed for selling. You can obtain them at Piltz seedlist (Austrocacti with SAR-fieldnumbers). Of course, we are propagating a lot of plants and hope to ...

Hello, coming back from a short trip to Czech Republic we noticed this thread. First of all thanks for the kind remarks about our booklet on the cacti of Patagonia. We would like to show you three pictures of one month old austrocactus seedlings: Austro_bertinii_SAR511.JPG Austro_coxii.JPG Austro_be...

Hallo, sorry for my bad english and sorry for the late answer. We have a lot of austrocacti (mostly grown from seed) and we think it is not so difficult to cultivate these plants in Europe (we are living in Germany near Aachen and the weather conditions shoult be not better than in England). Most pl...