Marion County Weed List
(Click on thumbnails for larger photo)
Education & Control
These species are already present in the County, sometimes in large patches. It is important to suppress the growth of these species to prevent further habitat loss. |
Immediate Action/EradicateThese species are not prevalent in the County, but are believed to on the move. They should be eradicated immediately to prevent further spread. |
| False brome
Brachypodium sylvaticum |
 | Common gorse
Ulex europaeus |
 | Giant, Japanese, and
Himalayan or Bohemian knotweeds
Polygonum sp. or Fallopia sp |
 | Diffuse knapweed
Centaurea diffusa |
 | Meadow & spotted knapweed
Centaurea pratensis |
 | Garlic mustard
Alliaria petiolata |
 | Milk thistle
Silybum marianum |
 | Giant Hogweed
Heracleum mantegazzianum |
 | Puncturevine
Tribulus terrestris |
 | Italian thistle
Carduus pycnocephalus |
 | Purple loosestrife
Lythrum salicaria |
 | Kochia
Kochia scoparia |
 | Tansy Ragwort
Senecio jacobea |
 | Oblong Spurge
Euphorbia oblongata |
 | Yellow flag iris
Iris pseudacorus |
 | Paterson’s curse
Echium plantagineum |
 | Yellow toadflax
Linaria vulgaris |
 | Rush skeletonweed
Chondrilla juncea |
| |
 | Traveler's Joy
Clematis vitalba |
| |
 | Yellow starthistle
Centaurea solstitialis |
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Need to report a county-listed noxious weed? Reporting can be done easily by using the Oregon Invasive Species Hotline. Give it a try!
