The Dirt |

Info on common tansy: a noxious weed in Oregon, toxic to humans. It has feathery leaves, yellow flowers, and requires management.

July 1, 2026

The Dirt | Weed of the Month July 2026 | Common tansy (Tanacetum vulgare)

Our July Weed of the Month is Common tansy (Tanacetum vulgare). Though it shares "tansy" in the name, it is a different species than the widely known…

Ox-eye daisy (Leucanthemum vulgare) is a noxious weed in Oregon, displacing native plants; management involves digging or herbicides.

June 1, 2026

The Dirt | Weed of the Month June 2026 | Ox-eye daisy (Leucanthemum vulgare)

Our June Weed of the Month is Ox-eye daisy (Leucanthemum vulgare) . Originally from Europe, ox-eye daisy was introduced to North America as a garden…

The image discusses Orange hawkweed, an invasive plant in Oregon, highlighting its identification, issues, and management methods.

May 1, 2026

The Dirt | Weed of the Month May 2026 | Orange hawkweed (Hieracium aurantiacum)

Our May Weed of the Month is Orange hawkweed (Hieracium aurantiacum). Known for its strinking orange flower, orange hawkweed is a perennial…

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

April 1, 2026

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.

March 1, 2026

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.

February 2, 2026

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.

January 1, 2026

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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