Invasive Plant Resources

Canada Thistle & Tansy

Purple Canada thistle and yellow tansy ragwort are invasive plants that grow in disturbed lands.

NPS Exotic Plant Management Team

The sources listed below have information
on invasive exotic plants and ways to
stop their spread.

More information on Olympic’s website:

Help Stop the Spread of Invasive Species
Nonnative Species
Invasive Exotic Plants
Volunteer Opportunities


Reporting Sightings within Olympic National Park:

If you can positively identify invasive exotic plants, report when and where you see the weeds to the nearest ranger station or visitor center.

English Ivy

Park staff and volunteers work to restore forested areas by pulling up English ivy.

NPS Volunteer Office

Olympic Peninsula
Noxious Weed Control Boards:

Washington State NWCB
Clallam County NWCB
Jefferson County NWCB

Other sources:

NPS: Weeds Gone Wild
NPS: Invasive Plant Management
National Invasive Species Council
USDA APHIS: Plant Pest Program
USDA Forest Service: Invasive Plants
Center for Invasive Plant Management

Some of the invasive plant species information on this website came from “Management of Exotic Plants in Olympic National Park” by Richard W. Olson, Jr., Edward G. Schreiner, and Lance Parker.

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