Terri, it's a Spicebush, not Spicevine. We'll teach you!
Kent, that's a good point. One reason Monarch Watch will only send you plugs from your ecotype region is exactly the reason you said. I've bought seeds from a local native nursery in my area and the lady even writes which county she collected them from on the packet. Now, I just have to get around to sowing them. And clearing space for them. And weeding. And all the other things I have to do. At least with gardening as a hobby, you never run out of things to do!