Weed of the Month Archive

"False brome is a noxious weed in Oregon. It invades forests. Manage by digging/mowing or herbicide. Benton County CWMA info."

The Dirt | Weed of the Month September 2025 | False Brome (Brachypodium sylvaticum)

Our September Weed of the Month is False brome (Brachypodium sylvaticum). False brome is notorious for invading forest understories and edges. It is a…

Tansy Ragwort is a toxic, invasive weed in Oregon, thriving in sunlit areas. Recommended removal: manual digging and herbicides.

The Dirt | Weed of the Month August 2025 | Tansy Ragwort (Senecio jacobaea)

Tansy ragwort is an invader of upland prairies, pastures, and anywhere in full sun. The leaves are distinctly crinkly and lobed. This species exhibits…

Infographic on poison hemlock: description, dangers, and management tips, by Benton Soil and Water Conservation District.

The Dirt | Weed of the Month July 2025 | Poison Hemlock (Conium maculatum)

Our weed of the month this month is poison hemlock (Conium maculatum). Infamous for being the plant that likely poisoned the Greek philosopher…

"English hawthorn is the Weed of the Month; a noxious shrub in Oregon. Dig up or use herbicide for management. Info by Benton SWCD."

The Dirt | Weed of the Month June 2025 | English Hawthorn (Crataegus monogyna)

English hawthorn (Crataegus monogyna) is a shrub or small tree that typically thrives in sunny pastures and partly shaded forest understories. It has…

Poster about oblong spurge (Euphorbia oblongata), a noxious weed needing management, with contact info and images.

The Dirt | Weed of the Month May 2025 | Oblong/Eggleaf Spurge (Euphorbia oblongata)

Our weed of the month appears right as its vibrant yellow coloring does. Oblong or eggleaf spurge (Euphorbia oblongata) is a perennial plant that is…

Weed of the Month: Lesser Celandine. Invasive, spreads easily, forms dense mats. Controlled by excavation and herbicides.

The Dirt | Weed of the Month April 2025 | Lesser Celandine (Ficaria verna)

Our weed of the month for April is Lesser Celandine (Ficaria verna)!

Infographic on Herb Robert, a noxious weed, describing its features, problems, and management methods.

The Dirt | Weed of the Month March 2025 | Herb Robert (Geranium robertianum)

Our weed of the month for March is Herb Robert (Geranium robertianum). This little annual plant goes by a variety of rather fun common names, which…

The Dirt | Introducing Weed of the Month! February 2025 | Italian Arum (Arum italicum)

Benton SWCD is excited to introduce our Weed of the Month series. Like other SWCDs, we believe in the importance of highlighting invasive species not…