Five people gather around as one uses loppers on a vine
Natural Resources Specialist Paul Carlson, left, and Montgomery County Parks Forest Ecologist Carole Bergmann lead a Weed Warrior volunteer training, removing Oriental bittersweet and other invasive plants at Meadowside Nature Center in Rockville, Md. (Photo by Caitlin Finnerty/Chesapeake Bay Program)
A woman speaking and pointing instructs unseen volunteers while a man cuts vines from a tree in a forest.
Carole Bergmann started the Weed Warriors program in 1999 to enlist volunteers in the effort to tackle invasive plants across 36,000 acres of Montgomery County parkland. “I knew that I couldn’t possibly do all the things I wanted to do without getting more people involved and giving them more responsibility and control," Bergmann said. (Photo by Caitlin Finnerty/Chesapeake Bay Program)
Multi-colored blue berries hang from a porcelainberry vine.
Porcelainberry and other invasive vines can girdle native trees and shrubs, smothering plants and reducing the health of the forest. (Photo courtesy of Steve Guttman/Flickr CC BY-NC-ND 2.0 DEED, cropped and toned)

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