Wallowa Resources is serious about weed control - we work with landowners and public land managers to help control this threat. We can't do this alone - we need your help in this effort: below you'll find ten of the worst weeds in the county. You can download the individual guides for that particular weed where we apply our P.I.T. approach (Problem-Identification-Treatment).

Get the entire 10 worst weeds PDF Guide here

Need to find others?
Visit the USDA Oregon Noxious Weeds Site

Common Bugloss

common buglossCommon Bugloss is primarily found in the upper Imnaha River Corridor of Wallowa County. It is characterized by a fiddleneck-like flowerhead that unfurls as it emerges, alternate leaves, and bright blue to purple flowers with small white centers.

Get the PDF ID Guide Here

Leafy Spurge

leafy-spurgeLeafy Spurge sap can cause extreme skin irritation and possibly blindness if it gets in your eyes. It is toxic to cattle, causing lesions around the eyes and mouth if ingested. It is characterized by showy yellow heart-shaped bracts and tiny yellow-green flowers.

Get the PDF ID Guide Here

Meadow Hawkweed

meadow-hawkweedMeadow hawkweed can be found in a handful of counties in Oregon, including Wallowa County. Meadow hawkweed is characterized by a cluster of yellow flowers growing at the end of a long and relatively leafless stem, rhizomes, and dandelion-like seeds.

Get the PDF ID Guide Here

Medusahead Rye

medusaheadMedusahead forms dense mats that choke out annual plants and perennial grass seedlings. It is unpalatable and the barbed awns can injure animals. This annual grass can be characterized by its seed with long awns that twist when dry and bristles or spikes that stay on the stem all year.

Get the PDF ID Guide Here

Orange Hawkweed

orange-hawkweedThe only known sites of Orange Hawkweed are found in Davis Creek and Memaloose, but larger populations can be found nearby in Washington and Idaho. It is easily distinguished from other hawkweeds by its red-orange flowers clustered at the end of long slender stems.

Get the PDF ID Guide Here

Rush Skeletonweed

rush-skeletonweedRush Skeletonweed can be found scattered within the Grande Ronde, Snake and Joseph Creek Watersheds. It can be identified by 7 to 15 bright yellow petals with distinct teeth at the ends, branched stems with a few very small leaves, and coarse reddish hairs near the stem’s base.

Get the PDF ID Guide Here

Spotted Knapweed

spotted-knapweedSpotted Knapweed is extremely aggressive and hard to control. It is characterized by purple, pink, or white flowers and dark scales on the bud. It is similar to Diffuse Knapweed, but Diffuse is generally bushier and has spines on the bud scales.

Get the PDF ID Guide Here

Sulfur Cinquefoil

sulfur-cinquefoilSulfur Cinquefoil spreads rapidly, is often misidentified as one of the native cinquefoils, and is very difficult to control. It can be identified by pale yellow flowers and leaves that grow upright against the stem and overlap one another.

Get the PDF ID Guide Here


whitetopWhitetop invades moderately moist, sunny sites in rangelands and pastures. It can be distinguished from other white flowered mustards by its smooth (not ribbed) stems, puffed seedpods and extensive root system.

Get the PDF ID Guide Here

Yellow Starthistle

yellow-starthistleYellow Starthistle can form solid stands, displacing other vegetation, reducing forage for livestock and wildlife and increasing erosion. It is poisonous to horses and the spines can injure other grazers. Yellow Starthistle can be identified by winged stems, a flower with bright yellow petals atop a distinctive spiny bud, and cottony pubescence covering the stem and leaves.

Get the PDF ID Guide Here

Photo Credit: Weeds Illustrations

Photo/Illustrations Credit: USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 3: 560

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