Oriental Bittersweet is native to East Asia (specifically China, Japan, and Korea), but was introduced to North America in the 1860s as an ornamental plant. Oriental bittersweet is an invasive plant, most commonly found in landscapes, woodlands, and roadsides due to climate and systematic disturbances. It's classified as an invasive because of how fast it spreads and its effects on trees. These include taking/stealing light and nutrients from the trees, clinging to the tree with its vines, choking it, and more. When used to make wreaths in the fall, it's carelessly disposed of after, left to spread. Birds and other small animals feast on the red and yellow fruits in fall, then excrete the seeds as they move from one place to another. To fix this, you need to remove the plant (by root) starting with the vines near the ground. In the United States, Oriental Bittersweet can be found as far south as Louisiana and as far east as Maine (this includes Hopkinton, New Hampshire).