thank you all for your comments!
I grow them for sereval years. I plant them in bowls in a bark, pumice stome mix. I will show photos of the whole plant next days. The tempretures are intermidiate most of the time. They grow well but over winter i have sometimes problems with rotton shoots especially when they are in bud. So I think it is importent to grow them not to wet over winter.
Wow! I've to tell mine to hurry up a bit but to reach the size of yours it'll take years if not decades...
Got mine last year singlegrowthed. In spite of being pollinated it made two new growth... long way to go...