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  Island County Noxious Weed List  
                         
 

This table provides the names of ALL the weeds listed for control in Washington state.

Weeds listed with the red * are those that have been found in Island County...if you find one that is not listed in red, (it still must be controlled) please contact our office so that we can update our information.

Please see "Key" provided at the end of this list for additional help in determining the level of control dictacted by the "class" of each weed.

  
 
Common Name
Botanical Name
Class
Baby's Breath Gypsophila paniculata

C
Bindweed, Field Convolvulus arvensis C
Broom, Spanish Spartium junceum A
Buffalobur Solanum rostratum A
Butterfly Bush Buddlega davidii C
Canarygrass, Reed Phalaris arundinacea C
Chervil, Wild Anthriscus sylvestris B
Clary, Meadow Salvia pratensis A
Cordgrass, Common Spartina anglica * B
Cordgrass, Dense-Flowered Spartina densiflora A
Dodder, Smoothseed Alfalfa Cuscuta approximata C
Elodea, Brazilian Egeria densa * B
Groundsel, Common Senecio vulgaris C
Gorse Ulex europaeus * B
Hawkweed, Orange Hieracium aurantiacum * B
Hawkweed, SSP all other non-native Hieracium C
Hawkweed, Yellow Hieracium caespitosum * B
Hogweed, Giant Heracleum mantegazzianum A
Ivy, English Hedera Hibernica "Hibernica"
Hedera Helix "Baltica"
Hedera Helix "Pittsburgh"
Hedera Helix "Star"		 C
Knapweed, Bighead Centaurea macrocephala A
Knapweed, Diffuse Centaurea diffusa * B
Knapweed, Meadow Centaurea jacea x nigra * B
Knotweed, Bohemian Polygonum bohemicum * B
Knotweed, Giant Polygonum sachalinense * B
Knotweed, Japanese Polygonum cuspidatum * B
Loosestrife, Purple Lythrum salicaria * B
Parrotfeather Myriophyllum aquaticum * B
Poison Hemlock Conium maculatum * C
Pondweed, curly-leaf Potamogeton crispus C
Ragwort, Tansy Senecia jacobaea * B
Sage, Clary Salvia sclarea A
St. Johnswort, Common Hypericum perforatum C
Starthistle, Purple Centaurea calcitrapa A
Tansy, Common Tanacetum vulgare C
Thistle, Bull Cirsium vulgare C
Thistle, Canada Cirsium arvense * C-D
Thistle, Milk Silybum marianum A
Thistle, Musk Carduus nutans B
Toadflax, Dalmation Linaria dalmataica ssp. dalmatica B
Toadflax, Yellow Linaria vulgaris C
Velvetleaf Abutilon, theophrasti A
Watermilfoil, Eurasian Myriophyllum spicatum B
Willowherb, hairy Epilobium hirsutum * C
Wormwood, Absinth Artemesia absinthium C
 
   
   
                         
 

Key

Class A - Generally, new invaders, these weeds have a limited distribution in our state. They represent a potentially serious threat if they are allowed to spread unchecked. Early action has the greatest chance of success and minimizes expenses and resource damage. Therefore, preventing new infestations and eradicating (removing/destroying) existing infestation is our highest priority. Control is mandatory.

Class B - These weeds are presently limited to portions of our state. They have been designated for control here because they are not yet considered widespread in Island County. Control is mandatory for these weeds, with our goal being that of preventing new infestations (not allowing plants to produce seed) and eventually eradicating existing infestations.

Class C Designate (C-D) - While these weeds are indeed very widespread, the Island County Noxious Weed Control Board has determined that they pose a significant threat to various aspects of land use, public safety, and our environmental resources. Therefore, we require (rather than encourage) long-term programs of suppression and control. The objective is to minimize their further spread into areas that are being actively farmed, maintained, or restored.

Class C - These weeds are so widespread in our county that we do not require control, but do encourage long-term programs of suppression and control.

  
 

Contact us: Don Meehan 360-679-7327 Accessibility | Copyright | Policies
 Washington State University Cooperative Extension - Island County P.O. Box 5000 Coupeville, WA 98239-5000 USA