This plant originates from eastern Asia, but was brought to the US for its looks. It's still used today to decorate, despite its destructive tendencies. For this plant to be removed, it needs to be clipped and have the roots fully pulled out of the ground. Those vines could be put to dry out on a tarp, or just into trash bags. Oriental bittersweet latches onto a living plant, usually trees, then grows onto it while spreading all around, and strangles the plant by taking away all of the plants resources. One way that the bittersweet is spreading is through animals. They eat the berries off of the vine and as they move, and the seeds come out through their waste. This plant does grow in NH and even in Hopkinton, with some right by the high school growing on a tree.