My Allamanda carthartica finally has buds and is opening a bloom ... I had a purple one many years ago which died on me (before I knew how to take care of plants) and I have never seen it since. Allamanda blanchetii ...
I don't know it's age as I have only had it a few months. Yes, it is outside in a pot. I cannot have any plants indoors as I live in an old cottage with 60cm walls and small windows.