The top 10 unwanted garden plants

2. Bittersweet vine (Celastrus orbiculatus)
There are two kinds of bittersweet: Oriental bittersweet (Celastrus orbiculatus) from Asia and American bittersweet (Celastrus scandens), the native North American version. It’s the Oriental bittersweet that should be avoided, but often plants are mislabeled at garden centres and the invasive vine masquerading as its native counterpart finds its way into gardens. The vine produces attractive orange-red berries that are popular for fall wreaths and are also appealing to birds, which then spread the seeds in natural areas. Along with aggressive roots, this vine can quickly overcrowd native plants and trees.