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Region 5 Class B Weed Designates

Region 5 contains all lands lying within the boundaries of Grays Harbor, Mason, Kitsap, Thurston, Pierce, and King counties.

Common name Scientific name Designated for control in:
alysum, hoary Berteroa incana All of Region 5
arrowhead, grass-leaved Sagittaria graminea All of Region 5 except Mason Lake in Mason County
blackgrass Alopecurus myosuroides All of Region 5
blueweed Echium vulgare All of Region 5
bryony, white Byronia alba All of Region 5
bugloss, common Anchusa officinalis All of Region 5
bugloss, annual Anchusa arvensis All of Region 5
camelthorn Alhagi maurorum All of Region 5
chervil, wild Anthriscus sylvestris Region 5, except those portions of Thurston County within T15, 16, 17N, R2, 3, 4W
cinquefoil, sulfur Potentilla recta Region 5, except Thurston and Pierce counties
cordgrass, smooth Spartina alterniflora All of Region 5
cordgrass, common Spartina anglica All of Region 5
elodea, Brazilian Egeria densa King County, except lakes Washington, Sammamish, Union, and Fenwick
fanwort Cabomba caroliniana All of Region 5
fieldcress, Austrian Rorippa austriaca All of Region 5
floating heart, yellow Nymphoides peltata All of Region 5
gorse Ulex europaeus Thurston, Kitsap, Pierce, and King counties
hawkweed, mouseear Hieracium pilosella Region 5, except Thurston County

Thurston County lying within:

  • T17N, R1W, S31
  • T16N, R2W, S30, W1/2
  • T16N, R3W, S25, SE1/3
  • T16N, R3W, S36, N1/2
  • T16N, R2W, S31, NW1/4
hawkweed, orange Hieracium aurantiacum Thurston and King counties only
hawkweed, polar Hieracium atratum Region 5 outside the boundaries of Mt. Ranier National Park
hawkweed queen-devil Hieracium glomeratum All of Region 5
hawkweed, smooth Hieracium laevigatum All of Region 5
hawkweed, yellow Hieracium caespitosum All of Region 5
hedgeparsley Torilis arvensis All of Region 5
helmet, policeman's Impatiens gladulifera Region 5, except Pierce and Thurston counties
indigobush Amorpha fruticosa All of Region 5
knapweed, black Centaurea nigra Region 5, except that area below the ordinary highwater mark of the Nisqually River, beginning at Alder Dam and downstream to the mouth of the Nisqually River in Pierce and Thurston counties
knapweed, brown Centaurea jacea Region 5, except that area below the ordinary highwater mark of the Nisqually River, beginning at Alder Dam and downstream to the mouth of the Nisqually River in Pierce and Thurston counties
knapweed, diffuse Centaurea diffusa All of Region 5
knapweed, meadow Centaurea jacea x nigra Region 5, except that area below the ordinary highwater mark of the Nisqually River, beginning at Alder Dam and downstream to the mouth of the Nisqually River in Pierce and Thurston counties
knapweed, Russian Acroptilon repens All of Region 5
knapweed, spotted Centaurea biebersteinii All of Region 5
Kochia Kochia scoparia All of Region 5
lepyrodiclis Lepyrodiclis holosteoides All of Region 5
loosestrife, garden Lysimachia vulgaris Region 5, except King County

Those portions of King County lying :

  • north of 1-90, and
  • east of the line extending from SR522 to SR202 to E. Lake Sammamish Parkway
  • west of 1-5, including Vashon Island, and
  • south of 1-90 and east and south of I-405 to the county line
loosestrife, purple Lythrum salicaria Grays Harbor, Mason, Kitsap, and Thurston counties and

Those portions of King County lying :

  • north of 1-90, and
  • east of the line extending from SR522 to SR202 to E. Lake Sammamish Parkway
  • west of 1-5, including Vashon Island, and
  • south of 1-90 and east and south of I-405 to the county line
loosestrife, wand Lythrum virgatum Region 5, except King County and

Those portions of King County lying :

  • north of 1-90, and
  • east of the line extending from SR522 to SR202 to E. Lake Sammamish Parkway
  • west of 1-5, including Vashon Island, and
  • south of 1-90 and east and south of I-405 to the county line
nutsedge, yellow Cyperus esculentus All of Region 5
oxtongue, hawkweed Picris hieracioides All of Region 5
parrotfeather Myriophyllum aquaticum All of Region 5
pepperweed, perennial Lepidium latifolium All of Region 5
primrose, water Ludwigia hexapetala All of Region 5
ragwort, tansy Senecio jacobaea in Region 5, that portion of Pierce County lying south or east of a boundary beginning at the White River and State Highway 410, then:
  • west along State Highway 410 to intersection with State Highway 162 (Orting) to intersection with Orville Road, and
  • south along Orville Road to intersection with Kapowsin Highway (304th Street East), and
  • west following Kapowsin Highway to intersection with State Route 7, and
  • south along State Road 7 to intersection State Route 702, then
  • west along Route 702 to intersection with State Route 507, then
  • southwest along State Route 507 to intersection with the Nisqually River
saltcedar Tamarix ramosissima All of Region 5, unless intentionally established prior to 2004
sandbur, longspine Cenchrus longispinus All of Region 5
skeletonweed, rush Chondrilla juncea All of Region 5
sowthistle, perennial Sonchus arvensis ssp. arvensis Region 5, except for sections 28, 29, 30, 31, 32, and 33 in T19N, R1E of Thurston and Pierce counties
spurge, leafy Euphorbia esula All of Region 5
starthistle, yellow Centaurea solstitialis All of Region 5
swainsonpea Sphaerophysa salsula All of Region 5
thistle, musk Carduus natans All of Region 5
thistle, plumeless Carduus acanthoides All of Region 5
thistle, Scotch Onopordum acanthium All of Region 5
toadflax, Damlatian Linaria dalmatica ssp. dalmatica All of Region 5

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