Sorry, I live in a cool clime so I don't have any first hand knowledge of this one pushing zone boundaries. I know it's rated for zones 9-10 but don't know offhand of anyone growing it in a cooler area.
Hopefully CValentine (Cheryl) can help, she lives in Texas, although I can't remember where....
Name: Dave Whitinger Jacksonville, Texas Resident cubit-master
A lot of those musas are zone 9 for sure. I had 'Rojo' and enjoyed it for many years by mulching it heavily each fall. 2 winters ago we had an extremely hard freeze (around 10 degrees for 3 days) and it killed it.