Roundleaf bittersweet

Roundleaf bittersweet is a woody deciduous vine native to East Asia and widely invasive in North America. It grows rapidly, climbing and girdling trees with twining stems and forming dense mats that smother understory vegetation. Female plants produce abundant orange-yellow fruits that are readily dispersed by birds, allowing the vine to spread far beyond planting sites. Once established, oriental bittersweet alters forest structure and regeneration and is difficult to control without repeated, long-term management. Roundleaf bittersweet new to Oregon and will be reviewed for listing in the next few months, but is being treated as an A-listed species. It was recently spotted in floral arrangements, where the seeds can be widely distributed.

Please report this weed to the OregonInvasivesHotline.org.