Don't know...... in Germany it has become fashionable to plant exotics like ,,hardy" palm trees and Camellia which were considered tender a few years earlier. I did the same in my former garden in northern Germany. It worked very well and I saw a subtropical garden arising in my best fantasies...... until a ,,normal" winter came and wiped the dreams out. Climate change means more heat, yes, but it also means more extremes which may also be cold. With a new El Niño phenomenon building up we will see what it will bring to all of us.....
Uli
Uli