Hello!
I do have a Trichocereus huascha in my collection from Golling and when I got it the owner sayd that it is not possible to cross with it as a mother because it allways brings a fruit.
Plants like these are called selbstvertil in German.
My translator says in English it is called self-serving.
In the next year I have seperated the plant bevore the first flower opened and it was not possible that pollon from other plants reached it. It has made a fruit.
Next time I have cut the flower bevore it opened and it also made a fruit.
To stay by the topic: I am in contact with the owner of the Gräsers Erfolg x SB and I will inform you in the next days what I could find out about it.
Bye,
Walter