Thurston County Noxious Weed List


Following the adoption of the State Noxious Weed Control list, the Thurston County Weed Board adopts a list that includes those mandated by the State of Washington that are present in Thurston County, and several others selected for control by the County. Thurston County is included in region 2 of WAC 16.750 State Noxious Weed List and Schedule of Monetary Penalties.

The 2014 noxious weed list for Thurston County is comprised of the following species-for a printable list, click here.

Common Name
Scientific Name
 
blueweed
Echium Vulgare
blueweed
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bugloss, annual
Anchusa arvensis
annual bugloss
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bugloss, common
Anchusa officinalis
common bugloss
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bush, butterfly
Buddleia davidii

Control is required on transportation and utility rights of way, public lands, designated forest land and gravel mines only.

butterfly bush
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click here for video
chervil, wild
Anthriscus sylvestris
wild chervil
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click here for video
elodea, Brazilian
Egeria densa
brazilian elodea
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click here for video
fennel,common
except variety, azoricum
Foeniculum vulgare
common fennel
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click here for video
geranium,shiny
Geranium Lucidum
shiny geranium
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gorse
Ulex europaeus

gorse
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click here for video
hawkweed, common
Hieracium lachenalii



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hawkweed, Mouseear
Hieracium pilosella

Control is required on transportation rights of way only.
mouseear hawkweed
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hawkweed, orange
Hieracium aurantiacum
orange hawkweed
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hawkweed, wall
Hieracium murorum


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hawkweed, yellow
Hieracium caespitosum
yellow hawkweed
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hawkweed, yellow devil
Hieracium floribundum
yellow devil hawkweed
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hemlock, poison
Conium maculatum
poison hemlock
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hogweed, giant
Heracleum mantegazzianum
gian hogweed
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Click here for video
knapweed, diffuse
Centaurea diffusa
diffuse knapweed
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knapweed, meadow
Centaurea jacea x nigra
 
Except the area below the ordinary high-water mark of the Nisqually River, downstream from Alder Dam to Puget Sound.
meadow knapweed
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knapweed,spotted
Centaurea biebersteinii
spotted knapweed
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knotweed, Bohemian
Polygonum Bohemicum

Control is required on transportation and utility rights of way, public lands, designated forest land and gravel mines only.

(not accepted as yard waste or garbage at Thurston County WARC disposal sites)
bohemian knotweed
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knotweed, giant
Polygonum sachalinense

(not accepted as yard waste or garbage at Thurston County WARC disposal sites)
giant knotweed
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knotweed, Himalayan
Polygonum polystachyum

(not accepted as yard waste or garbage at Thurston County WARC disposal sites)
himalayan knotweed
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knotweed, Japanese
Polygonum cuspidatum

Control is required on transportation and utility rights of way, public lands, designated forest land and gravel mines only.

(not accepted as yard waste or garbage at Thurston County WARC disposal sites)
japanese knotweed
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Click here for video
loosestrife, garden
Lysimachia vulgaris
garden loosestrife
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loosestrife, purple
Lythrum salicaria

(Purple and Wand loosestrife are similar in appearance)

purple loosestrife
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loosestrife, wand
Lythrum virgatum

(Purple and Wand loosestrife are similar in appearance)
milfoil, variable-leaf
Myriophyllum heterophyllum
variable leaf milfoil
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parrotfeather
Myroriophyllum Aquaticum
parrotfeather
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Click here for video
Pepperweed, Perennial
Lepidium latifolium
perennial pepperweed
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ragwort, tansy
Senecio jacobaea

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.
tansy ragwort
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reed, common
(nonnative genotypes of)
Phragmites australis
common reed
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skeletonweed, rush
Chondrilla juncea
rush skeletonweed
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sowthistle, perennial
Sonchus arvensis ssp. arvensis
perennial sowthistle
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spurge laurel
Daphne laureola
spurge laurel
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thistle, Italian
Carduus pycnocephalus
italian thistle
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thistle, milk
Silybum marianum

milk thistle
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thistle, Scotch
Onopordum acanthium
scotch thistle
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thistle, slenderflower
Carduus tenuiflorus
slenderflower thistle
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toadflax, Dalmatian
Linaria dalmatica ssp. dalmatica
dalmatian toadflax
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yellow flag iris
Iris pseudacorus

Black Lake only
yellow flag iris
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Contact Us

Address questions or comments to: tcweeds@co.thurston.wa.us

To help protect the state's resources, the Washington State Noxious Weed Control Board adopts a State Noxious Weed List each year. This list categorizes weeds into three major classes - A, B and C - according to the seriousness of the threat they pose to the state or a region of the state. Contact the Washington State Noxious Weed Control Board to participate in the weed listing process.

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