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Home > Invasive Species

Help Collect Noxious Weeds

The Washington Native Plant Society is encouraging members and other interested participants to help improve scientific documentation of invasive plants in Washington through herbarium collections. 

To identify what specimens are needed from each county, click on the counties of the Washington map below.

See how to make collections and what to do with them once you have collected them. If possible, collections in triplicate of each species for any county would be helpful, as they will be shared with other institutions. 

Even if you can only collect a few specimens your effort and your willingness to follow through with correct label information and mailing will be a contribution to science.

The history of your collection will be preserved for generations to come at the University of Washington and Washington State University.


Counties

Adams Franklin Lewis Snohomish
Asotin Garfield Lincoln Spokane
Benton Grant Mason Stevens
Chelan Grays Harbor Okanogan Thurston
Clallam Island Pacific Wahkiakum
Clark Jefferson Pend Oreille Walla Walla
Columbia King Pierce Whatcom
Cowlitz Kitsap San Juan Whitman
Douglas Kittitas Skagit Yakima
Ferry Klickitat Skamania  
Adams County Grant County Asotin County Benton County Chelan County Clallam County Clark County Columbia County Cowlitz County Douglas County Ferry County Franklin County Garfield County Grays Harbor County King County Island County Kitsap County Kittitas County Klickitat County Jefferson County Lewis County Lincoln County Mason County Okanogan County Pacific County Pend Oreille County Pierce County Skagit County San Juan County Skamania County Snohomish County Spokane County Stevens County Thurston County Wahkiakum County Walla Walla County Whatcom County Whitman County Yakima County