I looked on the Web and found out 3 things.
1. it is frost hardy, at least to Zone 9.
2. It is from southeast Asia.
3. They can't seem to agree whether it is spelled roebelinii or roebelenii. IK
has roebelinii.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"A tree never hits an automobile except in self defense." - Woody Allen