How bad does this stuff spread? The reason I ask is I stumbled on a big patch of it today and am considering possibly transplanting some. Of course, since I know where to find it I may be just as well to go there if I need more, but the idea of walking out my back door to cut arrow shafts is appealing. I'm a typical suburbanite with 0.6 acres of land, and I don't want it to spread all over my neighbor's land (well, maybe if he doesn't make his dog shut the hell up), but I do have an area across the back property line that was an old fence row and is kind of a waste area now.