2008 Kitsap Weed List
- Kitsap County 2008 Weed List Brochure - PDF
- Kitsap County Designated Weeds for Control
- Other Noxious Weeds of Concern in Kitsap County
- New Weeds on the 2008 State List
- Class Definitions
- Why Should We Care About Invasive Plants?
Noxious weeds are non-native plants introduced to Washington through human actions. Because of their aggressive growth and lack of natural enemies in the state, these species can be highly destructive, competitive or difficult to control. These exotic species can reduce crop yields, destroy native plant and animal habitat, damage recreational opportunities, clog water-ways, lower land values and poison humans and livestock.
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.
Kitsap County Designated Weeds for Control
| Common Name | Scientific Name |
| Butterfly Bush | Buddleia davidii |
| Dalmation toadflax | Linaria dalmatica ssp. Dalmatica |
| English Ivy | Hedera helix 'Baltica' "Pittsburgh' & 'Star' Hedera hibernica 'Hibernica' |
| Fragrant water lily | Nymphaea odorata |
| Giant hogweed | Heracleum mantegazzianum |
| Gorse | Ulex europeaeus |
Knapweeds, |
|
| Knotweeds, -Bohemian -Giant -Himalayan -Japanese |
Polygonyum bohemicum P. sachalinense P. polystachyum P. cuspidatum |
| Loosestrifes, Purple & Want Garden |
Lythrum Salicaria & L. virgatum Lysimachia vulgaris |
| Poison Hemlock | Conium maculatum |
| Policeman's Helmet | Impatiens glandulifera |
| Tansy Ragwort | Senecio jacobaea |
Other Noxious Weeds of Concern in Kitsap County
| Common Name | Scientific Name |
| Blueweed | Echium vulgare |
| Brazilian elodea | Egeria densa |
| Buffalobur | Solanum rostratum |
| *Common fennel (non-bulbing) | Foeniculum vulgare |
| Common groundsel | Senecio vulgaris |
| Common reed (non-native genotypes) | Phragmites australis |
| Common tansy | Tanacetum vulgare |
| cordgrass, Common | Spartina anglica |
| cordgrass, Smooth | Spatina alterniflora |
| Curly-leaf pondweed | Potamogeton crispus |
| Eggleaf spurge | Euphorbia oblongata |
| Eurasian watermilfoil | Myriophyllum spicatum |
| Field bindweed | Convolvulus arvensis |
| Garlic Mustard | Alliaria petiolata |
| Goatsrue | Galega officinalis |
| Hairy willow-herb | Epilobium hirsutum |
| Hawkweed, Orange | Hieracium aurantiacum |
| Herb-robert | Geranium robertianum |
| Hydrilla | Hydrilla verticillata |
| Kudzu | Pueraria montana var. lobata |
| Myrtle Spurge | Euphorbia myrsinites |
| Old man's beard | Clematis vitalba |
| Oxeye daisy | Leucanthemum vulgare |
| Parrotfeather | Myriophyllum aquaticum |
| Perennial pepperweed | Lepidium latifolium |
| Perennial sowthistle | Sonchus arvensis |
| Puncturevine | Tribulus terrestris |
| Reed canarygrass | Phalaris arundinacea |
| Rush skeletonweed | Chondrilla juncea |
| Scotch broom | Cytisus scoparius |
| Spanish broom | Spartium junceum |
| *Spurge laurel | Daphne laureola |
| St. Johnswort | Hypericum perforatum |
| thistle, Bull | Cirsium vulgare |
| thistle, Canada | Cirsium arvense |
| thistle, Milk | Silybum marianum |
| thistle, Musk | Carduus nutans |
| Velvetleaf | Abutilon theophrasti |
| Water primrose | Ludwigia hexapetala |
| Water primrose | Ludwigia peploides |
| Wild carrot | Daucus carota |
| Wild chervil | Anthriscus sylvestris |
| Wild four o'clock | Mirabilis nyctaginea |
| *Yellow archangel | Lamiastrum galeobdolon |
| Yellow flag iris | Iris pseudacorus |
| Yellow floating heart | Nymphoides peltata |
| Yellow toadflax | Linaria vulgaris |
| *New weeds 2007 |
New Weeds on the 2008 State List to be on the Look-Out For:
| Ricefield bush | Schoenoplectus mucronatus |
| European hawkweed | Hieracium sabaudum |
| Variable-leaf milfoil | Myriophyllum heterophyllum |
Class Definitions
Class A Weeds: Non-native species with a limited distribution in Washington. Preventing new infestations and eradicating existing infestations is the highest priority. Eradication is required by law.
Class B Weeds: Non-native species presently limited to portions of the state. Species are designated for control in regions where they are not yet widespread. Preventing new infestations in these areas is a high priority. In regions where a Class B species is already abundant, control is decided at the local level, with containment as the primary goal.
Class C Weeds: Non-native weeds found in Washington. Many of species are widespread in the state. Long-term programs of suppression and control are a County option, depending upon local threats and the feasibility of control in local areas.
Why Should We Care About Invasive Plants?
Plants are the building blocks for all life. Plants are used for all our basic needs of food, clothing and shelter. Many large and small wild animals depend on plants as a core food source. Invasive plants disrupt the natural systems and out compete many beneficial plants. Once invasive species take hold of the land, they normally persist for many years, costing landowners time and money for control.
To learn more about Kitsap County Noxious Weed Program, contact Dana Coggon at (360) 307-4242.
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