Pacific Northwest Invasive Plant Council

Find an Invasive

Please check the county weed board website to determine whether the plant is considered a high priority species or on the monitor list. Feel free to contact the county weed board or the contact person on the website for more information

For Washington state:

Definitions of these classes for Washington state are:

For Oregon state:

Definitions for Oregon state are:

For British Columbia:, or

Contact David Ralph at, or by phone at (250) 371-6062.

For Alaska: or

Contact Gino Graziano at for additional information.

Hedera helix
Hedera helix
Polygonum cuspidatum (Japanese knotweed
Polygonum cuspidatum
Euphorbia esula (leafy spurge)
Euphorbia esula