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Noxious Weeds Resources
Find noxious weed resources below to guide your management, identification, disposal, and more. Additional brochures and other literature are available through the Noxious Weed Control Program. Call 360-376-3499 for additional information.
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Some non-native invasive plants overtake ponds, lakes, streams and shorelines, posing a threat to native vegetation, diminishing wildlife habitat, altering water quality and impacting recreational uses.
Some noxious weeds can be controlled with the aid of certain insects that are native to the weeds’ countries of origin.
There are certain noxious weeds that thrive in forested environments and pose a particular problem to trees and forest landscapes.
- WSU Extension Forestry (link to website)
- Nonnative Invasive Plants of Pacific Coast Forests (pdf)
- Noxious Weeds in San Juan County Forests - A Guide (pdf)
- USFS Invasive Plants Field and Reference Guide (pdf)
Noxious weeds may look very familiar, as many of our listed weed species are escaped ornamental or landscape plants, such as oxeye daisy or Himalayan blackberry.
- Washington State Noxious Weed Control Board (link to website)
- Washington State Noxious Weed Board Weed Search Tool (link to website)
- King County Weed Identification Photos (link to website)
- Citizens Guide to Noxious Weeds in King County (pdf?)
- Field Guide to Noxious and Other Selected Weeds of British Columbia (pdf?)
- Oregon Noxious Weed Profiles (OSDA) (link to website)
- The Burke Herbarium Image Collection (University of Washington-Seattle)
Some of our noxious weed species pose a health risk to humans, pets and livestock, such as poison hemlock and tansy ragwort.
Washington State is a national leader in noxious weed legislation, particularly in RCW 17.10 and WAC 16-750.
Brochures and Posters
- SJC Blackberry Control (pdf)
- SJC Bull Thistle Control (pdf)
- SJC Canada Thistle Control (pdf)
- SJC Clematis/Old Man’s Beard Control (pdf)
- SJC Common Fennel Control (2020 pdf)
- SJC Common Teasel Control (outdated pdf)
- SJC English Hawthorn Control (pdf)
- SJC English Holly Fact Sheet (pdf, King County)
- SJC English Ivy Control (outdated pdf)
- Giant Hogweed Control (pdf, state weed board)
- SJC Gorse Control (pdf)
- SJC Herb-Robert Control (pdf)
- SJC Hoary Cress Poster (pdf)
- Italian Arum Control (pdf, state weed board)
- Knapweeds of Washington Booklet (pdf, state weed board)
- SJC Scotch Broom Control (pdf)
- SJC Spurge Laurel Poster (pdf)
- SJC Tansy Ragwort Control (pdf)
- SJC Yellow Archangel Control (pdf)
- SJC Yellow Flag Iris Control (pdf)
- Noxious Weeds in San Juan County Forests (pdf)
- Washington Invasive Plant Council: https://www.pnw-ipc.org/
- Washington Invasive Species Council: https://invasivespecies.wa.gov/
- National Invasive Species Council: https://www.doi.gov/invasivespecies
- National Invasive Species Information Center: https://www.invasivespeciesinfo.gov/
- Weed Research and Information Center: https://wric.ucdavis.edu/
- California Invasive Plant Council: https://www.cal-ipc.org/
- Washington Native Plant Society: https://www.wnps.org/
- National Pesticide Information Center: http://npic.orst.edu/