Hy do we speak about subtropicum or singchii. For me it is not 100% sure that it is the same kind. If you look at the drawings.An interesting species. I hope we will have it in collections one day..
I was sent some seed from China as a gift and sent it to a friend in the USA for flasking. It has germinated, but waiting now for leaves to be produced.
My friend who sent it from China, says he intends to try to cross his plant with warm growing species from America and Asia. He is also trying to flask propagate it. I hope he succeeds.