WEED LIST

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rangeland. and fields hay degrade and species forage healthy and wildflowers 5

Grassland invaders invaders Grassland spotted knapweed, orange hawkweed and milk thistle crowd out out crowd thistle milk and hawkweed orange knapweed, spotted

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policeman’s helmet clog waterways, crowd out native plants and harm fish and wildlife . wildlife and fish harm and plants native out crowd waterways, clog helmet policeman’s Learn more and report online at at online weeds report and more Learn 4

Wetland and aquatic invaders aquatic and Wetland purple and loosestrife, Brazilian elodea and and elodea Brazilian loosestrife, garden and purple

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people and . and people reviewed annually and public input input public and annually reviewed 3

Toxic weeds Toxic giant hogweed, tansy ragwort and poison-hemlock pose serious health risks to to risks health serious pose poison-hemlock and ragwort tansy hogweed, giant species for educational purposes. The list is is list The purposes. educational for species

also list additional, non-regulated invasive invasive non-regulated additional, list also

efforts to restore rivers and reforest timberland. reforest and rivers restore to efforts

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County Noxious Board. We We Board. Control Weed Noxious County

Invasive plants Invasive Scotch broom, knotweed, butterfly bush and Himalayan blackberry impede impede blackberry Himalayan and bush butterfly knotweed, broom, Scotch

selected from the state list by the King King the by list state the from selected

in King County, and Class B and C species species C and B Class and County, King in overwhelm native species and harm wildlife habitat. wildlife harm and species native overwhelm

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Class B weeds state-designated for control control for state-designated weeds B Class Forest invaders Forest garlic mustard, English ivy and yellow archangel can damage trees, trees, damage can archangel yellow and ivy English mustard, garlic

Board (WAC 16-750) as Class A weeds, all all weeds, A Class as 16-750) (WAC Board

wildlife and can be impossible to eradicate. to impossible be can and wildlife Washington State Noxious Weed Control Control Weed Noxious State Washington

added maintenance costs. Once invasive plants spread to natural areas, they harm native plants and and plants native harm they areas, natural to spread plants invasive Once costs. maintenance added WEED LIST WEED consists of all species set by the the by set species all of consists

cost our region millions of dollars in lost agricultural production, environmental degradation and and degradation environmental production, agricultural lost in dollars of millions region our cost KING COUNTY’S NOXIOUS NOXIOUS COUNTY’S KING

NOXIOUS WEEDS NOXIOUS are a danger to our environment and the economy. These species introduced These economy. the and environment our to danger a are

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their part. State weed law information can can information law weed State part. their

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designated noxious weeds to prevent them them prevent to weeds noxious designated

land managers are required to control control to required are managers land

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LAW (RCW 17.10) (RCW LAW protects natural and and natural protects

WASHINGTON’S NOXIOUS WEED WEED NOXIOUS WASHINGTON’S 5 4

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KING COUNTY’S Noxious Weed 2019 King County Control Program Noxious Weed List

The Program protects the natural and THE NOXIOUS WEED PROGRAM economic resources of county residents. We IS HERE TO HELP: ensure that noxious weeds that are regulated • Technical assistance with ID and control in King County are controlled. Our weed • Free workshops and info booths at events specialists teach property owners to identify • Brochures, fact sheets and weed guides and control noxious weeds so they do not • Control assistance for high priority weeds spread to other properties. We make sure • Disposal vouchers for regulated weeds public agencies control regulated noxious weeds on roads and public lands to reduce • Weed pullers and knotweed injectors for loan impacts to public resources and prevent OUR MISSION: spread to neighboring lands. To provide benefits to the environment, If you are unsure how to identify or control a recreation, public health and economic regulated noxious weed or have a hardship resources of King County by preventing and that prevents you from doing so, the minimizing harmful impacts of noxious weeds. program can provide assistance. If a property You can help fight noxious weeds by planting owner refuses to control a regulated noxious only non-invasive plants, disposing of noxious weed, state law authorizes the county weed weeds responsibly, reporting infestations of board to pursue control through a notice of regulated noxious weeds that are not being violation and, if necessary, bill the landowner controlled, and controlling weeds on your own for the control cost. We work to avoid this property. Thank you for helping! and we do all we can to help landowners find Photo credit: Karen Peterson a solution that works for them. CONTACT US: Poison-hemlock, Class B noxious weed King County Noxious Weed Control Program DEFINITIONS (RCW 17.10, WAC 16-750) 201 S. Jackson St., Suite 600, Seattle WA 98104 STOP THE INVADERS! Noxious Weed - a non-native plant that 206-477-WEED (206-477-9333) when established is highly destructive, [email protected] competitive, or difficult to control Visit our website and report weeds at Control - in a given year, prevent all kingcounty.gov/weeds production and dispersal of all propagative parts capable of forming new plants. Department of Natural Resources and Parks Department of - completely eliminate a noxious Water and Land Resources Division Eradicate Natural Resources and Parks weed within an area of infestation. Noxious Weed Control Program Water and Land Resources Division

This information can be Noxious Weed Control Program made available in alternate formats. Call 206-477-9333 or TTY: 711 2019 KING COUNTY NOXIOUS WEED LIST The King County Noxious Weed Control Board has adopted this Noxious Weed List in accordance with RCW 17.10 and WAC 16-750.

REGULATED CLASS A WEEDS: These weeds are REGULATED CLASS B WEEDS: Class B weeds are regulated in counties where they are limited in distribution or where they the highest priority in the state due to their significant potential are a local priority. The following Class B weeds have been designated for control in King County by the State Weed Board or selected by impact and limited distribution. Property owners throughout the King County Weed Board. Property owners in King County are required to control these species. Washington are required to eradicate Class A weeds. COMMON NAME SCIENTIFIC NAME COMMON NAME SCIENTIFIC NAME COMMON NAME SCIENTIFIC NAME common crupina 6 Crupina vulgaris blueweed; viper’s bugloss 1, 6 Echium vulgare saltcedar 6 Tamarix ramosissima 3, 6 6 cordgrass, common 6 Spartina anglica Brazilian elodea Egeria densa shiny geranium Geranium lucidum cordgrass, dense flower 6 Spartina densiflora bugloss, annual Anchusa arvensis spurge, leafy 1, 6 Euphorbia virgata cordgrass, saltmeadow 6 Spartina patens bugloss, common 6 Anchusa officinalis starthistle, Malta Centaurea melitensis cordgrass, smooth 6 Spartina alterniflora camelthorn Alhagi maurorum starthistle, yellow 1 dyers woad 6 Isatis tinctoria common reed Phragmites australis sulfur cinquefoil Potentilla recta (non-native genotypes) eggleaf spurge 1, 6 Euphorbia oblongata tansy ragwort 1, 6 Dalmatian toadflax6 Linaria dalmatica ssp. false brome 6 Brachypodium sylvaticum thistle, musk 6 Carduus nutans dalmatica 6 floating primrose-willow6 Ludwigia peploides thistle, plumeless Carduus acanthoides European coltsfoot Tussilago farfara flowering-rush 6 Butomus umbellatus thistle, Scotch 6 fanwort 6 Cabomba caroliniana French broom 1, 6 Genista monspessulana velvetleaf 6 Abutilon theophrasti 6 gorse Ulex europaeus 6 garlic mustard 6 Alliaria petiolata water primrose Ludwigia hexapetala grass-leaved arrowhead 6 Sagittaria graminea giant hogweed 1, 6 Heracleum mantegazzianum white bryony 1 Bryonia alba 6 hairy willowherb Epilobium hirsutum 1, 6 goatsrue 1, 6 Galega officinalis wild chervil Anthriscus sylvestris hawkweeds; All non-native Hieracium, subgenus 6 yellow floatingheart 6 Nymphoides peltata hydrilla Hydrilla verticillata species and hybrids of the Pilosella Johnsongrass 1, 6 Sorghum halepense meadow subgenus 5, 6 yellow nutsedge Cyperus esculentus knapweed, bighead 6 Centaurea macrocephala 5, 6 hawkweed, European Hieracium sabaudum 6 knapweed, Vochin Centaurea nigrescens hawkweed, orange 6 Hieracium aurantiacum REGULATED CLASS C WEEDS: Class C weeds are generally widespread, but may be selected 6 Pueraria montana var. lobata hawkweed oxtongue Picris hieracioides on a local level. The following Class C weeds have been 6 meadow clary Salvia pratensis hoary alyssum Berteroa incana selected by the King County Weed Board based on potential oriental clematis 6 Clematis orientalis threats and feasibility of control. Property owners in King houndstongue 1 Cynoglossum officinale 1, 6 County are required to control these species. purple starthistle Centaurea calcitrapa indigobush 6 Amorpha fruticosa 6 reed sweetgrass Glyceria maxima knapweed, black 6 COMMON NAME SCIENTIFIC NAME ricefield bulrush6 Schoenoplectus mucronatus knapweed, brown 6 Centaurea jacea absinth wormwood 1 Artemesia absinthium sage, clary 6 Salvia sclarea knapweed, diffuse 6 Centaurea diffusa buffalobur 6 Solanum rostratum sage, Mediterranean 6 Salvia aethiopis knapweed, meadow 6 Centaurea x moncktonii 1, 6 silverleaf nightshade Solanum elaeagnifolium knapweed, Russian 1 Rhaponticum repens LEGEND small-flowered jewelweed Impatiens parviflora 6 Known to occur in King County knapweed, spotted Centaurea stoebe Spanish broom 1, 6 Spartium junceum Historically present, but thought to be eradicated kochia 6 Bassia scoparia CONTROL REQUIRED Syrian beancaper 6 Zygophyllum fabago loosestrife, garden 6 Lysimachia vulgaris Texas blueweed 6 Helianthus ciliaris loosestrife, purple 6 Lythrum salicaria thistle, Italian 6 Carduus pycnocephalus parrotfeather 6 Myriophyllum aquaticum thistle, milk 1, 6 Silybum marianum perennial pepperweed 6 Lepidium latifolium 6 thistle, slenderflower Carduus tenuiflorus poison-hemlock 7 Conium maculatum variable-leaf milfoil 6 Myriophyllum heterophyllum 6 policeman’s helmet Impatiens glandulifera Control noxious weeds to protect people, , wild four o’clock 6 Mirabilis nyctaginea rush skeletonweed Chondrilla juncea crops and the environment.

NON-REGULATED NOXIOUS WEEDS: The following Class B and C weeds from the state noxious weed list also impact the county, but are already widespread. Property owners in King County are not required to control these species, except FOOTNOTES: where noted, but control is recommended where feasible. 1 Reported to be toxic to livestock and/or humans. Sources: USDA Poisonous Plant Research Laboratory, USDA Natural COMMON NAME SCIENTIFIC NAME CLASS COMMON NAME SCIENTIFIC NAME CLASS Resources Conservation Service, WA State Weed Board. blackberry, evergreen Rubus laciniatus C reed canarygrass Phalaris arundinacea B This list is for general information only and may not be all-inclusive. Contact a medical professional for information blackberry, Himalayan Rubus armeniacus C Scotch broom 1, 2, 6 Cytisus scoparius B about symptoms and treatment. butterfly bush6 Buddleja davidii B spotted jewelweed Impatiens capensis C 2 Control of Scotch broom is required on the right-of-way of common barberry Berberis vulgaris C spurge laurel 1 Daphne laureola B King County’s section of SR-2 and on the I-90 right-of-way common catsear Hypochaeris radicata C thistle, bull C between mile marker 34 and the King/Kittitas County line. common fennel Foeniculum vulgare B thistle, Canada C 3 Brazilian elodea is designated for control throughout King (except var. azoricum) 1 tree-of-heaven C County except in Lake Washington, Lake Sammamish, Lake common groundsel 1 C ventenata Ventenata dubia C Union, Lake Fenwick, Lake Doloff and the Sammamish River. common St. Johnswort C 4 watermilfoil, Eurasian 6 Myriophyllum spicatum B Control of Bohemian, Japanese, giant and Himalayan common tansy 1 Tanacetum vulgare C Polygonum xbohemicum, P. cuspidatum, P. watermilfoil hybrid 6, Myriophyllum spicatum x C knotweed ( sachalinense, P. polystachyum) is required on the Green common teasel C (Eurasian x northern) M. sibiricum River and its tributaries above the Auburn City Limits and curlyleaf pondweed Potamogeton crispus C 6 wild carrot Daucus carota C on the Cedar River and its tributaries above the Renton field bindweed Convolvulus arvensis C yellow archangel 6 Lamiastrum galeobdolon B City Limits (tributaries included are those defined as Type Nymphaea odorata C S, F or N aquatic areas in KCC 21A.24.355). Control of fragrant waterlily yellowflag iris 1 Iris pseudacorus C these invasive knotweed species is required up to the hairy whitetop 1 Lepidium appelianum C yellow toadflax Linaria vulgaris C ordinary high water mark (or to the top of the bank if the hawkweeds; All non- Hieracium, subgenus B ordinary high water mark cannot be identified) and in the native species and Hieracium WEEDS OF CONCERN: adjacent buffer area as specified in KCC 21A.24.358. This hybrids of the wall The following plant species are not listed as noxious weeds requirement to control knotweed is contingent upon the 5, 6 subgenus under state law and property owners are not required noxious weed program or program partners providing hawthorn, English Crataegus monogyna C to control them. However, the King County Weed Board knotweed control services in the selected area for affected recognizes these non-native plants as invasive, recommends herb-Robert Geranium robertianum B private land landowners who request assistance. control or containment of existing populations, and 1 5 hoary cress Lepidium draba C discourages new plantings. King County’s Critical Areas Non-native yellow-flowered hawkweeds (Hieracium species) Italian arum Arum italicum C Ordinance cites this list, formerly known as the Obnoxious are consolidated into two listings by subgenus: meadow Weed List, as invasive vegetation that threatens native (Pilosella) and wall (Hieracium). Control of species in the ivy, English (four ‘Baltica’ C by displacing beneficial vegetation and degrading meadow group is required in King County. Control of cultivars only: ‘Baltica’, Hedera helix ‘Pittsburgh’ wildlife and native plant habitat. The Noxious Weed Control species in the wall group is not required in King County Hedera helix ‘Star’ ‘Pittsburgh’,‘Star’, Program provides education and outreach services for these with the exception of European hawkweed (Hieracium and ‘Hibernica’) 1 Hedera hibernica ‘Hibernica’ weeds (as authorized by RCW 17.10.090). sabaudum). jubata grass Cortaderia jubata C 6 Quarantine species. It is prohibited to transport, buy, sell, 4, 6 knotweed, Bohemian Polygonum x bohemicum B COMMON NAME SCIENTIFIC NAME offer for sale, or distribute plants, plant parts or of bird cherry Prunus avium knotweed, giant 4, 6 Polygonum sachalinese B this species within the state of Washington. Noxious Weed bishop’s weed Aegopodium podagraria Seed and Plant Quarantine, WAC 16-752-600. Contact knotweed, Himalayan 4, 6 Persicaria wallichii B 1 Washington State Department of for knotweed, Japanese 4, 6 Polygonum cuspidatum bittersweet nightshade Solanum dulcamara B complete list.

lesser celandine 6 Ficaria verna B black locust Robinia pseudoacacia 7 Control of poison-hemlock is required on public lands and buttercup, creeping 1 Ranunculus repens non-native cattails and Typha angustifolia, T. x C public right-of-way. hybrids including narrow-glauca, T. domingensis buttercup, tall 1 Ranunculus acris CONTROL RECOMMENDED CONTROL leaf and southern cattail English holly 1 Ilex aquifolium (does not include native 1 English laurel Prunus laurocerasus common cattail) European mountain ash Sorbus aucuparia Department of Natural Resources and Parks old man’s beard 1 Clematis vitalba C Water and Land Resources Division hedge bindweed, Calystegia sepium 6 oxeye daisy Leucanthemum vulgare C morning glory Noxious Weed Control Program 206-477-9333 TTY Relay:711 Pampas grass Cortaderia selloana C multiflora rose Rosa multiflora kingcounty.gov/weeds perennial sowthistle Sonchus arvensis C rough chervil 1 Chaerophyllum temulum File name: 1902_9471m_noxWEEDlist2019-reprint.indd Ravenna grass Saccharum ravennae B silver lace vine Fallopia baldschuanica Printed on recycled paper. Please recycle. syn. Polygonum aubertii