Pollinator Pockets West Roxbury, MA
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Invasive Species

Oriental Bittersweet

Celastrus orbiculatus

A woody vine that climbs, strangles, and topples mature trees under its own weight.

Why it's harmful How to ID it How to remove it
Oriental bittersweet in summer, showing glossy rounded green leaves and small greenish flowers clustered along the stem
Photo: Dalgial via Wikimedia Commons · CC BY-SA 3.0

📝 Draft content — written for your review. Verify the identification and removal details before publishing.

Why it’s harmful

Oriental (or Asiatic) bittersweet is a woody vine that climbs high into the canopy, wrapping around trunks and branches.

  • It girdles and strangles trees and shrubs, cutting off their flow of water and nutrients.
  • Its sheer weight can bend and topple even large trees, especially in wind, ice, or snow.
  • It forms dense thickets that smother native shrubs and the wildflowers pollinators feed on.
  • It hybridizes with and displaces our native American bittersweet (Celastrus scandens).
  • Birds eat the showy berries and spread the seeds far and wide.

How to ID it

  • Vine: a twining woody vine, light gray-brown, that can grow as thick as your wrist on old plants.
  • Leaves: alternate, rounded and glossy, with finely toothed edges.
  • Fruit position — the key clue: flowers and berries grow all along the stem in the leaf joints (axils). Native American bittersweet produces fruit only in clusters at the branch tips.
  • Berries: yellow capsules in fall that split open to reveal bright red-orange fleshy seeds.

Look-alike: Native American bittersweet is worth protecting — the fruit-position difference (along the stem vs. only at the tips) is the easiest way to tell them apart.

📸 2 photos to help you recognize it in different settings and seasons.Click any photo to enlarge and browse.

How to remove it

  1. Young vines & seedlings: pull them out by hand when the soil is moist, removing as much root as possible.
  2. Vines climbing trees: cut the stem near the ground to relieve the tree. Do not try to rip vines down out of tall trees — falling deadwood is dangerous. Cut them low and let the upper portion die in place.
  3. Expect resprouting: cut stems regrow vigorously. The most reliable kill is an immediate cut-stump herbicide treatment (triclopyr or glyphosate) on the fresh-cut surface, ideally in late summer or fall.
  4. Dispose of berries: bag and trash any fruit so birds can’t spread it.
  5. Monitor: re-cut and re-treat regrowth over several seasons.

Sources and local guidance vary — when removing invasives, follow the latest advice from groups like the Massachusetts Invasive Plant Advisory Group (MIPAG) and your local conservation commission.