Noxious Weeds List

The following is a list of species known to be present or have the potential to infest Thurston County. It is approved and updated annually by the Thurston County Weed Board.

Noxious Weed Classifications

• species new to the state

• limited distribution throughout state

• goal is to eliminate before established

• landowners required to control

• widespread in parts of state, limited or absent in other parts of the state

• goal is to prevent spread into new areas and contain or reduce existing populations

• the state designates Class B noxious weeds in certain areas

• a county weed board may select Class B noxious weeds for control in the county

• landowners required to control Class B designate and Class B select noxious weeds

• control of all other Class B noxious weeds not required but recommended

• often widespread, or of special interest to agriculture

• a county weed board may select a Class C non-designate for control if it is considered a local priority

• control of all other Class C noxious weeds not required but recommended

The noxious weeds below only includes weeds from the Noxious Weeds List which have been found in Thurston County. For a printable list of all species regulated by Thurston County, click here

Noxious Weeds Fact Sheets

Scientific Name | Archusa arvensis

Scientific Name | Polygonum Bohemicum

Scientific Name | Egeria densa - Fact sheet awaiting approval

Scientific Name | Anchusa officinalis

except variety, azoricum
Scientific Name | Foeniculum vulgare

(nonnative genotypes of)
Scentific Name | Phragmites australis

Scientific Name | Linaria dalmatica ssp. dalmatica

Scientific Name | Centaurea diffusa

Scientific Name | Euphorbiaoblongata - Fact sheet awaiting approval

Scientific Name | Tussilago farara

Scientific Name | Alliaria petiolate - Fact sheet awaiting approval

Scientific Name | Heracleum mantegazzianum

Scentific Name | Polygonum sachalinense

Scientific Name | Ulex europaeus

Scientific Name | Carex pendula - Fact sheet awaiting approval

Scentific Name | Persicaria wallichii

Scentific Name | Carduus pycnocephalus -Fact sheet awaiting approval

Scentific Name | Polygonum cuspidatum

Scientific Name | Ficaria verna - Fact sheet awaiting approval

Scientific Name | Centaurea jacea x nigra

Scientific Name | Hieracium pilosella

Scientific Name | Hieracium aurantiacum

Scentific Name | Cortaderia seloana

Control is required in Township 18 N, Range 2W, Section 10 and on all transportation and utility rights of way, public land and gravel mines.

Scentific Name | Myroriophyllum Aquaticum

Scentific Name | Lepidium latifolium

Scentific Name | Sonchus arvensis ssp. arvensis

Scentific Name | Conium maculatum

Scentific Name | Lythrum salicaria

Scentific Name | Chondrilla juncea

Scentific Name | Onopordum acanthium

Scentific Name | Geranium Lucidum

To be controlled on Thurston County property, gravel mines, heavy equipment storage areas and those rights of way that may directly or indirectly spread seed or contaminated material in wildlife refuges, nature preserves or other high quality habitat areas.

Scentific Name | Carduus tenuiflorus - Fact sheet awaiting approval

Scientific Name | Centaurea biebersteinii

Scentific Name | Daphne laureola

Scentific Name | Potentilla recta

Control is required on transportation rights of way in all of Thurston County and on all other land except that portion of Thurston County East of Range 1 East and South of Township 17 North.

Scentific Name | Jacobaea vulgaris

Control is required when 25 or more plants are present in an area of 20 acres or less. This area may include more than one parcel if the area is under the same ownership. Priority will be given to property in agricultural areas, particularly where livestock is present.