Class "C" Noxious Weeds

Are selected by the County Board of Directors. These weeds which are already widespread in Washington state are of special interest to the state's agricultural industry.


typically common and widespread, control of these plants is determined on a case-by-case basis.


Class "C" noxious weeds found in Benton County are shown below.  If you click on the image a larger image will be displayed. If you click on "*details*" the link will take you to the Washington State Noxious Weed Control Board website's description of the plant.

baby's breath, Gypsophila paniculata  *details*

baby's breath, Gypsophila paniculata details

buffalobur, Solanum rostratum  *details*

buffalobur, Solanum rostratum details

cereal rye, Secale cereale details

common St. Johnswort, Hypericum perforatum   *details*

common St. Johnswort, Hypericum perforatum details

field bindweed,  Convolvulus arvensis   *details*

field bindweed, Convolvulus arvensis *details*

field bindweed, Convolvulus arvensis details

fragrant water lily, Nymphaea odorata  *details*

fragrant water lily, Nymphaea odorata details

hairy whitetop, Lepidium appelianum  *details*

hairy whitetop, Lepidium appelianum details

hoary cress, Lepidium draba  *details*

hoary cress, Lepidium draba details

jointed goatgrass, Aegilops cylindrica  *details*

jointed goatgrass, Aegilops cylindrica details

longspine sandbur, Cenchrus longispinus  *details*

longspine sandbur, Cenchrus longispinus details

pampas grass, Cortaderia selloana  *details*

pampas grass, Cortaderia selloana details

reed canarygrass, Phalaris arundinacea *details*

reed canarygrass, Phalaris arundinacea details

spikeweed, Centromadia pungens  *details*

spikeweed, Centromadia pungens details

bull thistle, Cirsium vulgare  *details*

bull thistle, Cirsium vulgare details

Canada thistle, Cirsium arvense  *details*

Canada thistle, Cirsium arvense details

yellow flag iris, Iris pseudacorus  *details*

yellow flag iris, Iris pseudacorus details