Hello, I picked this up at a local garden center yesterday. It seems to be a new hybrid circulating in the plant trade. "Propagation prohibited" says the label. An internet search says it's a C. rotundifolia hybrid, not much else .
I could only add that it was probably bred by a Danish firm for the potted plant market. No Law in the World could stop you from from propagating it as long as you didn't sell it I would have thought?
I'm sure it will be hardy wherever you are.