I would at least give it frost protection until the weather warms up next spring, perhaps in a cold greenhouse, and then I would keep it in a container for another year so you can give it protection to suit the weather until it gains some size. It would be a shame to lose it now! (unlike branches of fuchsia, forsythia and buddlea which I have used to support perennial flowers, I now have these shrubs all rooted in entirely the wrong places ::))