Harney County’s Most Wanted Weed List–Updated
Posted on 04.10.23 by Harney SWCD
Harney County Weed Classification
Noxious weed for the purpose of this policy shall be rated “A”, “B”, or “C”.
“A” Pest– A weed of known economic importance known to occur in the county in small enough infestations to make eradication practicable or not known to occur, but it’s status in the surrounding counties makes future occurrence seem imminent.
*Species not yet known to occur in the county
Action: Infestations are subject to eradication where found with possible County assistance when
funds are available.
| African rue | Peganum harmala |
| Black Henbane | Hyoscyamus niger |
| Diffuse knapweed | Centaurea diffusa |
| Hoary Alyssum | Berteroa incana |
| Leafy spurge | Euphorbia esula |
| Musk thistle | Carduus nutans |
| Orange hawkweed | Hieracium aurantiacum |
| Pheasant eye | Adonis annua |
| Purple loosestrife | Lythrum salicaria |
| Rush skeletonweed | Chondrilla juncea |
| Salt cedar | Tamarix ramosissima |
| Scotch broom | Cytisus scoparius |
| Spotted knapweed | Centaurea maculosa |
| Squarrose knapweed | Centaurea virgata |
| Tansy ragwort | Senecio jacobaea |
| Yellow starthistle | Centaurea solstitialis |
| Yellow toadflax | Linaria vulgaris |
“B” Pest– A weed of known economic importance and of limited distribution in the county and is subject to
intensive control or eradication where feasible at the county level.
Action: Infestations are handled at County discretion with possible County assistance when funds
are available.
| Dalmatian toadflax | Linaria dalmatica |
| Houndstongue | Cynoglossum officinale |
| Mediterranean sage | Salvia aethiopis |
| Perennial pepperweed | Lepidium latifolium |
| Puncture vine | Tribulus terrestris |
| Russian knapweed | Acroptilon repens |
| Scotch thistle | Onopordum acanthium |
| Bull Thistle | Cirsium vulgare |
| Canada thistle | Cirsium arvense |
“C” Pest- A weed of known economic importance and of general distribution that is subject to control,
intensive control, or eradication as local conditions warrant.
Action: Infestations handled at owner’s discretion.
| Halogeton | Halogeton spp. |
| Klamath weed | Hypericum perforatum |
| Medusahead rye | Taeniatherum caput-medusae |
| Morning glory | Convolvulus arvensis |
| White top | Cardaria draba |