I've read in a couple of places that its hardiness zone is more 10 and 11 but has been reported by a nursery to have survived in zone 8 without protection. I would not take any chances. You can definitely follow Mark's good advice to be safe and save some cuttings. If you choose to leave outside, they should be protected from frost. I would buy frost cloth or N-sulate to cover the plant. When I was in SFe, NM, I covered some of my plants with both N-sulate and shade cloth. It was easier to shake off snow from the shade cloth than the N-sulate cloth.
