Hi, Frilly. I just recently got this one. I did some reseach and it is supposed to be hardy to Z6 and I'm Z7. My quest found that you should get one that is hardy at least one zone colder than you. Hope they're right. We can do our experiments together. Mine has been in the ground for a week. The 32° we had the day after it arrived didn't even bother it in the least.
Crepe Myrtle (Lagerstroemia Moonlight Magic™)
Do you have it now? Is yours in the ground yet?