Invasive Species

This informative video gives step by step instructions on how to manually remove knotweed from your property.

Invasive plants directly threaten our ecosystems by displacing native plants and the beneficial insects and wildlife that depend on them. Property values, and timber and agriculture production are also negatively affected by invasive species. The benefits of managing invasive species, such as English ivy, holly and blackberry, are many; reduced erosion, enhanced wildlife habitat, improved aesthetics and increased productivity.

The Conservation District has an active Early Detection, Rapid Response (EDRR) program to locate and manage priority invasive weeds before they can become established in our region. Species targeted by this program are capable of wide-range ecological and economic impact, but their limited presence makes them a focus for prevention and control efforts. To learn more about the program or to attend a Weed Watcher training, contact our Invasive Species Program Coordinator Michelle Delepine, 503.238.4775, ext. 115 or

The Invasive Weed Program is divided into two main categories:

EDRR (Early Detection-Rapid Response) Weeds

Common Weeds

The Conservation District has a wide variety of publications, reports, photos, videos and programs to share with you on invasive weeds – please look in our Library section for lots more information.




Sign up for Weed Watcher Training!

Do you want to be a Weed Watcher?  Sign up now for the next FREE training: Tuesday, May 9, 5:30-7:30 pm Multnomah Art Center, Rm. 8, 7688 SW Capitol Hwy. RSVP to Weed Watchers […]

Hummingbird Hill Forest Restoration Project

In 2013, West Multnomah Soil & Water Conservation District board member Jane Hartline met Carol Canning at a gathering in Linnton.  They quickly bonded over their distaste of English ivy, in particular the ivy covering […]