The Dirt |

The image discusses Bristly dogtail (Cynosurus echinatus), an aggressive noxious weed in Oregon, with management tips and identification details.

The Dirt | Weed of the Month April 2026 | Bristly dogtail (Cynosurus echinatus)

Our April Weed of the Month is Bristly dogtail (Cynosurus echinatus). One of many invasive annual grasses in Oregon, bristly dogtail is a tufted…

Info about Roundleaf Bittersweet: an invasive vine threatening trees. Management tips include cutting and herbicide use.

The Dirt | Weed of the Month March 2026 | Roundleaf bittersweet (Celastrus orbiculatus)

Our March Weed of the Month is Roundleaf bittersweet (Celastrus orbiculatus). Roundleaf bittersweet is a woody vine species that is originally native…

The Yellow Archangel is a problematic, adaptive weed with hairy, variegated leaves; management includes manual removal and herbicides.

The Dirt | Weed of the Month February 2026 | Yellow archangel (Lamiastrum galeobdolon)

Our February Weed of the Month is Yellow archangel (Lamiastrum galeobdolon). Yellow archangel is a perennial flower that exhibits lots of versatility…

The image features "Spurge Laurel," an invasive shrub with toxic fruits. It offers management tips for control and highlights its issues.

The Dirt | Weed of the Month January 2026 | Spurge laurel (Daphne laureola)

Our January Weed of the Month is Spurge laurel (Daphne laureola).

A person holding a smartphone while using a laptop, with a focus on their hand and nails. A USB drive is visible on the table.

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