Fight off Gresham’s weedy invaders by participating as a Weed Watcher in our Early Detection, Rapid Response Program. Learn about problem weeds here, and help us stop these plants in their tracks.
Effects of invasive weeds
Economic impacts
- Weeds damage valuable crops and poison livestock.
- Noxious weeds cost Oregon millions a year.
Environmental impacts
- Weeds crowd out native plants and upset fragile ecosystems.
- Weeds cause erosion that can affect ecosystems and homes.
- Weeds speed the decline and extinction of endangered and threatened species.
Weeds: most wanted list