I have one, grown from seeds I collected in the mountains between Portugal and Spain in 1986- still going strong
in a pot. They won't flower in a pot usually, and only then on last year's growth, so pruning them to get them into a greenhouse every year
pretty well ensures that I won't see flowers. i haven't pruned it this year, since it's going into an over- wintering enclosure
that has more height to it, but I'm not crossing my fingers!
A famously 'messy' tree- don't plant one by a path or you will be sweeping forever...:)