9. Sweet Autumn Clematis

Like other invasive vines, sweet autumn climatis (Clematis terniflora) is one of those “good-looking” plants that can overwhelm a landscape, killing native plants and flowers. It’s especially problematic in the lower Midwest and East.

While sweet autumn clematis has a very pleasant odor, if you decide to plant it, you’ll quickly realize that’s the only thing good about it. Some nurseries sell Clematis paniculata as sweet autumn clematis, but they are actually two different species. The former is a less invasive plant that comes from New Zealand, while the latter is the one you need to be very careful with.