Do either of you have a cranberry hibiscus? It's a perennial supposedly in zones 10 and 11. I do have one in the ground, though and the 28 degrees we had the other night didn't bother it, and it did get my tropical hibiscus.
It's a beautiful plant, but it's also the kind you use to make tea from the flowers. I love the flowers in tea and I usually buy them in bulk dried, but my mom bought a plant from a local market this year and rooted me a piece. From it, I've rooted 2 more pieces. It gets kind of tall and scraggly and doesn't branch out like tropical hibiscus, so I keep it pruned to about 2 feet tall, then plant the new starts with it to make it more shrub-like. The leaves are edible too, and so pretty in a salad. Anyway, I highly recommend them, if you don't have them. They're really pretty, and useful too!