Scotch broom is noxious in Pacific Northwest
Be on the lookout for prickly Paterson's Curse in wildflower seed mixes.
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.
Poisonous plants are a major cause of economic loss to the livestock industry. Two poisonous plants common to Oregon are poison hemlock and Western water hemlock. Ingestion of either by humans or livestock typically results in death.
Poison hemlock is one of the most poisonous of plants. Silage making has been used to reduce the concentrations of toxins in a variety of crops. Poison hemlock alkaloids are found in different concentrations depending on several factors that make it virtually impossible to predict how dangerous the plant is at any given time.