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Oregon Invasives

Think you've found an invader? Report potential invasive species to the Online Hotline.



Invasive species are species that are non-native and introduction of the species is likely to cause environmental or economic harm or harm to human health. Non-native species are defined as those not naturally occurring in this environment. A species can be non-native, but not considered invasive if it does not spread aggressively or cause harm. In the photo below, the invasive grass false-brome has invaded a woodland, creating a dense monoculture and choking out native species.

False-brome invasion of woodland floor

Council goals for removing invasive species

Nearly all of our on-the-ground projects address invasive plant species. Additionally, we facilitate Middle Fork Willamette Watershed Invasive Plant Species Working Group meetings and participate in the Early Detection Rapid Response (EDRR) program. We plan to continue our efforts to address invasive and non-native species throughout the watershed with each project.

Early Detection Rapid Response (EDRR)

Invasive species are a major problem for land managers and homeowners alike. Once they become established they are very difficult to eradicate and the costs of controlling them can be high. The most effective and cost efficient way to manage invasive species is to prevent them from expanding their ranges in the first place. When prevention fails, the next best thing is to find new invaders and aggressively manage infestations when they move into new territory. This type of management is referred to as Early Detection Rapid Response (EDRR).

EDRR focuses on monitoring areas to locate and treat infestations during the earliest stages of the invasion process. If noxious weeds are detected when they first arrive in a new area, they can be managed effectively and efficiently so they don't become established and widespread. EDRR programs rely on volunteers and local professionals to watch out for EDRR-list species where they work, live, and recreate.

Locations of target species should be reported to the state invasive species website ( The weed report will be forwarded to land managers so we can implement control measures to rapidly prevent establishment and spread.

We need your help to eradicate new invasive plants in the Middle Fork Willamette Watershed before they get out of control! We have list of priority invasive species that we want to keep out of the watershed. These plants are either new arrivals or they haven't gotten here yet (that we know of).

Here is the MFWWC list of priority species:

Garlic mustard Old man's beard
Giant hogweed Yellow archangel
Yellow floating heart Sulphur cinquefoil
European water chestnut Flowering rush
Yellow starthistle Yellow flag iris
Purple loosestrife Lesser celandine
Knotweeds (Japanese, Giant, Bohemian, and Himalayan) Zebra and Quagga mussels

If you think you have found one of the priority species described here please report it! 

Here's how:
1. Collect information
Take pictures of the plant. Take several pictures, including close-up pictures of leaves and flowers. Include an object (such as a coin, your hand, or your lens cap) for scale.
Describe the plant. How big are the leaves? Are there hairs on the leaves or stems? What color are the flowers? How many petals do the flowers have? Are there any other distinguishing features that catch your eye?
Where is the plant located? If you have a GPS unit, mark the point. The nearest address, intersection, or mile marker is helpful information. If you're on a trail note the nearest landmark and provide instructions on how to get to the infestation from there.
How big is the infestation? Is it just a few plants, or hundreds? How many feet long and wide is the infestation? Are the plants scattered or dense?
2. Report your sighting
Go to and click on the "Report Now" button. Provide all of the information that you collected as your fill out the form. Provide photographs if you have them. Please include your contact information so we can follow up with you if we have questions!

You can also call or email us to report a sighting. Please contact Elise Ferrarese, MFWWC Restoration Specialist at (541) 937-9800 or

More Invasive Species Informational Links: