Noxious weeds

Identification and control guidance and resources for noxious weeds and invasive plants in King County

Find a weed

Search for a noxious weed by common or scientific name to learn more about impacts, identification, and methods of control.

Select from the common names of the noxious weeds

Select from the scientific name of the noxious weeds

Weeds by Photo Weed List

Frequently found weeds

Poison hemlock

Poison hemlock
(Conium maculatum)

Invasive knotweed

Invasive knotweed
(Fallopia ssp.)

Himalayan blackberry

Himalayan blackberry
(Rubus armeniacus)

Common ivy

Common ivy
(Hedera helix)

Bull thistle

Bull thistle
(Cirsium vulgare)

Tansy ragwort

Tansy ragwort
(Jacobaea vulgaris)

Creeping buttercup

Creeping buttercup
(Ranunculus repens)

Bittersweet nightshade

Bittersweet nightshade
(Solanuum dulcamara)

Giant hogweed

Giant hogweed
(Heracleum mantegazzianum)

Related Topics

Report a noxious weed

Report noxious weed locations in King County.

What we do

Learn more about the noxious weeds program and its objectives.

Weed publications

Documents, resources, and reports.

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