Scotch broom is noxious in Pacific Northwest
Be on the lookout for prickly Paterson's Curse in wildflower seed mixes.
Most “sick tree” problems can be traced back to underlying stresses that have reduced the tree's vigor, making it more vulnerable to diseases or insect pests.
Gorgeous yellow iris Is ecological threat to PNW wetlands
Oregon is the first state to list invasive non-native grass called false brome as a noxious weed.
Butterfly bush, or Buddleia, can be a very aggressive non-native plant that, in certain situations, can overtake native vegetation. Take care to cut blossoms off in the fall.
A guide for how to collect and where to get a sample analyzed for plant diseases.