Hi your Californian weather would be about the same as where it grows here on Australia.
Our winter temps here get down to 2 degs Cel around 36 F and they can get even colder inland.
If they do get burnt by the frost they will reshoot.
So it should be Ok..Have a look at the link below...Cheers..MM. |
Here is a link that might be useful: Hibiscus splendens
