Summary of Invasiveness Top of page. It can self-seed, and has escaped cultivation and naturalized in many parts of the USA. It is reported to be invasive in a number of eastern states. Click below on a thumbnail map or name for subspecies profiles. Native Introduced Native and Introduced. Sweet autumn clematis (Clematis terniflora) makes a big statement in the fall landscape. The Plants Database includes the following 2 subspecies of Clematis terniflora . Sweet autumn virgin’s bower (Clematis terniflora), also known as sweet autumn clematis, is a vigorous woody vine that has fragrant flowers which bloom in the fall.Native to Japan, sweet autumn virgin’s bower was introduced to the United States in the late 1800s as an ornamental plant and has since spread in parts of the Southeast and Midwest. Research Committee of the Tennessee Exotic Pest Plant Council. Clematis ... Invasive exotic pest plants in Tennessee (19 October 1999). Tennessee. But it can also be invasive, so consider it carefully. Clematis terniflora is a perennial woody vine, native to Asia and introduced to North America as an ornamental. Clematis terniflora (sweet autumn clematis, sweet autumn virginsbower) is a plant in the buttercup family, Ranunculaceae.It is native to northeastern Asia (China, Japan, Korea, Mongolia, Russia (Siberia), Taiwan). North Carolina Invasive Plant Council. It was introduced into the United States in the late 1800s as an ornamental garden plant, and has naturalized in many of the eastern states.