Hi Hans (and team?)
A couple of years ago (2008?) I bought a small division of Bashania q. from you. In the years it has survived -30C twice since then. A fullgrown Rhododendron catawbiense froze to death but the bamboo was unharmed. My garden is outside of Skövde at 200m elevation. The great news is that the new shots are nearly 2,5cm in diameter. If this is what I hope this is not only at least as hardy as Fargesia murielae but also much bigger. Did I mention it spreads aggressivly? No other bamboo do that in my climate, not even Sasa palmata or S.kurilensis.
Of course this is not impressive in the Netherlands but here in inland Sweden its something different.