Noxious Weeds That Harm Washington State

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common reedPhragmites australisIdentification: Common reed is a large perennialgrass with woody, hollow stems up to12 feet tall.The lance-shaped leaves are up to 16 inches longand 1.5 inches wide and will often twist to oneside in the wind. The flowerheads are dense, silky,brownish-purple plumes that can reach 16 incheslong. Bloom time is July to October. Commonreed has an extensive, creeping rhizome network.Impact: This robust grass species forms densecolonies in both freshwater and saline wetlandsand ditches. These stands alter hydrology,displace native vegetation, and degrade valuablewetland habitat.Control: Since rhizomes can produce new plants,care must be taken to prevent dispersal. Mowing,when timed correctly, can reduce populations.For large infestations, selective aquaticherbicides can be effective, with late-summerthrough fall applications appearing to be mosteffective.W-6
Rich Old, www.xidservices.comRich Old, www.xidservices.comRich Old, www.xidservices.comClass B <strong>Noxious</strong> Weed W-7
Page 1 and 2: Noxious WeedsThat Harm Washington S
Page 3 and 4: Common Name Botanical Name Pagebutt
Page 5: Why are there laws about noxious we
Page 10 and 11: yellow nutsedgeIdentification: Yell
Page 12 and 13: spurge laurelDaphne laureolaIdentif
Page 14 and 15: orange hawkweedHieracium aurantiacu
Page 16 and 17: uffaloburIdentification: A member o
Page 18 and 19: common fennelFoeniculum vulgareIden
Page 20: gorse / Scotch broomDescription: Go
Page 23 and 24: Rich Old, www.xidservices.comClass
Page 25 and 26: Rich Old,www.xidservices.comClass B
Page 27 and 28: Nancy Ness,Grays Harbor NWCBClass C
Page 29 and 30: King County NWCBKing County NWCBRic
Page 31 and 32: Fran LuceroFran LuceroKing County N
Page 33 and 34: Class A Noxious Weed W-31
Page 35 and 36: P. bohemicum, and P. polystachyumSk
Page 37 and 38: Class B Noxious Weed W-35
Page 39 and 40: Sue Winterowd, Stevens County NWCBC
Page 41: Class B Noxious Weed W-39
Page 44 and 45: purple loosestrifeIdentification: P
Page 46 and 47: flowering rushIdentification: Flowe
Page 48 and 49: shiny geranium/herb-RobertIdentific
Page 50 and 51: knapweeds: spotted, diffuse, & mead
Page 52 and 53: policeman’s helmetImpatiens gland
Page 54 and 55: thistles: slenderflower & CanadaIde
Page 56 and 57: thistles: milk & ScotchSilybum mari
Page 58 and 59:
How can people help prevent andcont
Page 60:
Protecting Washington’s resources
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Noxious Weeds That Harm Washington State

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