1. About Us

    The Lewis County Noxious Weed Control Board recognizes that managing noxious weeds requires a community wide effort, and everyone living in the county benefits from all of us putting in our fair share of the work. The Washington State noxious weed law, RCW 17.10, mandates that it is each landowners' responsibility to control or eradicate noxious weeds on their property and to prevent infestations from spreading to adjacent properties. To assist landowners in this effort, the Noxious Weed Control Board develops programs that reflect local priorities, meet the needs of county landowners and carries out the mandates of the law. …


    Weed Control - Jan. 11, 2012, 8:32 a.m.

  2. Blackberry (Himalayan & Cutleaf)

    Rubus armeniacus & Rubus laciniatus Himalayan Blackberry Himalayan Blackberry Cutleaf Blackberry Cutleaf Blackberry Himalayan Blackberry - A rambling, evergreen, perennial, woody shrub with stout, hook-thorned stems.Leaves: Leaves are palmately compounded with 3-5 leaflets (5 is most common). Leaves have slightly toothed margins.Flowers: Flowers bloom from May-August. Flower clusters generally have between 5-20 flowers that have 5 petals and are white to rose in color.Habitat: Grows in a variety of habitats including forests, roadsides, railroad tracks, logged lands, field margins, and riparian areas.Weed Classification: CWhy is it a Noxious Weed?Himalayan Blackberry is very hard to control after a serious infestation has …


    Weed Control - Oct. 6, 2022, 9:32 a.m.

  3. Poison Hemlock

    Conium maculatum Poison Hemlock - Very tall biennial that can grow up to around 12 feet in height. Stems will have purple splotches that help with identification.Leaves: Leaves are fern-like, toothed and finely divided. Look very similar to wild carrot leaves.Flowers: Flowers bloom from April-August. Flowers are small, white, and occur in 4–8-inch umbrella-shaped clusters.Habitat: Plant is highly adaptive, but prefers rich, moist soil.Weed Classification: B SelectWhy is it a Noxious Weed?The entire plant is toxic to animals and humans. Contains poisonous alkaloids, such as coniine. Poison Hemlock can spread quickly and infest large areas.Poison Hemlock should not be burned, …


    Weed Control - Sept. 29, 2022, 9:48 a.m.

  4. Milk Thistle

    Silybum marianum Milk Thistle - A large, sparsely branched thistle growing up to 6 feet tall. Easy to identify, due to the leaf patterning.Leaves: Alternate, deeply lobed, and pointed leaves. Leaves have a very noticeable white and dark green marbling. The basal leaves can get up to 20 inches long and 10 inches wide.Flowers: Flowers bloom from May-August. Rounded cluster of tubular flowers that have spine-tipped bracts (scales) around it.Habitat: Occurs in many places such as: overgrazed pastures, roadsides, waste areas, ditches, and disturbed areas.Weed Classification: AWhy is it a Noxious Weed?It is an aggressive invader that can grow into …


    Weed Control - Sept. 29, 2022, 10:57 a.m.

  5. Tansy ragwort

    Jacobaea vulgaris Tansy Ragwort - An herbaceous plant that can either be a winter annual, a biennial, or sometimes a perennial. Mowing may cause the plant to grow like a perennial.Leaves: Twice divided leaves, with leaf stems at the bottom of the plant, but a singular, unbranched, stalk towards the top of the plant. First year Tansy will have a basal clump, and afterwards the leaves are alternate.Flowers: Flowers bloom from June - August. Somewhat flat-topped clusters of yellow disk and ray flowers. Flowers have bracts (scales) with black tips.Habitat: Commonly found in open, disturbed areas like roadsides, pastures, fields, …


    Weed Control - Sept. 29, 2022, 9:49 a.m.

  6. Knotweed

    Fallopia x bohemica, Fallopia japonica, & Fallopia sachalinensis Bohemian knotweed is the hybridization of Giant and Japanese knotweeds. They vary slightly in the size and shapes of their leaves and flowers but otherwise look and behave very similarly.Knotweed - Clumping and spreading perennial hollow zig-zagging stems and long creeping rhizomes.Leaves: Large leaves are alternate, leathery, and oval. The base is slightly indented to deeply heart-shaped and leaf midveins have hairs.Flowers: Flower clusters commonly made up of male flowers and located at stem and branch tips. Clusters are around 8 to 13 ¾ inches long. Sepals are white to pinkish white …


    Weed Control - Sept. 13, 2022, 3:38 p.m.

  7. Quarterly Weed Board Meeting

    Call To OrderAdoption of MinutesIntroduction of GuestsComments from the PublicCoordinators Report Budget Review Program Updates 2025 Field Season Challenges Actions Requested from the Weed Board Special TopicsOld BusinessNew Business Listing of Common HollyComments from Individual Members of the BoardDate of the Next Board Meeting: August 6th, 2025 @ 1:00 PM Followed by: November 12th, 2025Adjournment


    Weed Control - May 6, 2025, 8:50 a.m.

  8. Curlyleaf Pondweed

    Potamogeton crispus Curlyleaf pondweed - The entire plant stays underwater, except for the flower stalk, and usually only grows in the spring before dying off in the late summer.Leaves: Leaves are alternate along the stem, submerged, and oblong in shape. They are also stiff with distinctly wavy edges and fine teeth.Flowers: Flowers bloom from June-August. Flowers are very small and have 4 petal-like lobes.Habitat: Grows in shallow or deep water that can either be still or flowing and tolerates disturbances.Weed Classification: C SelectWhy is it a Noxious Weed?This plant can form dense colonies on the surface that interfere with aquatic …


    Weed Control - Oct. 5, 2022, 4:38 p.m.

  9. Projects

    Eradication: Class A Noxious Weeds Class A noxious weeds are Lewis County Noxious Weed Control's highest priority for early detection and rapid eradication. Generally, these noxious weeds are either entirely absent in Washington State or are only present in a very limited distribution. As such, and as required by law, the management goal for these weed species is total eradication in all plant parts. Garlic mustard, Giant hogweed, False brome and Milk thistle are all examples of Class A noxious weeds that have become more common in the state in recent years and could conceivably arrive in Lewis County from …


    Weed Control - March 20, 2015, 1:11 p.m.

  10. Lakes - Aquatic Weed Treatments

    Aquatic weeds pose a variety of risks, including flooding, habitat degradation, impeding water flow, decreasing recreational opportunities, and much more. Often forgotten about and less visually obvious to most people, aquatic weeds are frequently going under the radar. It is important for the public to be aware of the presence of aquatic weeds in the water bodies they visit and take measures to prevent their spread!The PlayCleanGo campaign provides excellent information on necessary precautions and procedures that should be taken by all, in order to reduce the spread of aquatic noxious weeds. Stop Aquatic Hitchhikers also offers a variety of …


    Weed Control - Sept. 6, 2022, 12:10 p.m.