Other names: Black swallow-wort (Cynanchum louiseae), pale swallow-wort (Cynanchum rossicum), dog strangler vine
Where did it come from?
It was imported from Europe in the late 1800s to be used in botanical gardens in Massachusetts.
Why is it invasive?
It covers the areas that it grows in and out competes most other plants. Animals that use the displaced plants lose valuable food plants and shelter.
How do you prevent its spread?
Remove plants from your property. Collect and destroy seedpods.
Resources:
♦ Species assessment black swallow-wort
♦ Species assessment pale swallow-wort
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Image credit: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org