Can you provide me with an extensive list of resources for checking whether a plant is invasive or a noxious weed?
Here is a list of helpful resources:
Washington State Noxious Weed List from the US Department of Agriculture
State noxious weed list and schedule of monetary penalties from the Washington State Legislature
Washington Department of Ecology (aquatic plants)
Washington Invasive Species Coalition and their GardenWise handbook
King County Noxious Weed Lists
National Invasive Species Lists
Plant Conservation Alliance Alien Plant Invaders list
The lists which are national in scope are useful too, as some plants not
yet officially listed as invasive here may still be plants to watch out
for.
There are a great many books on this subject. A recent one, co-authored
by a faculty member here, is Invasive Species in the Pacific Northwest edited by P.D. Boersma, S.H. Reichard, and A.N. Van Buren; Rebecca L. Gamboa, photo editor.
University of Washington Press, c2006.