1. Report An Infestation

    Report Weeds Here (<-- Click link)Citizens can report noxious weeds infestations utilizing the link above.If you are uncertain about ID, please take several photos of leaves, flowers, branches and entire plant, and send to weeds@lewiscountywa.gov or consult the state board online resource found here: Washington State Noxious Weed Control Board.


    Weed Control - April 6, 2023, 11:32 a.m.

  2. Lewis County Noxious Weed Map

    ArcGIS Noxious Weeds Map Click on the map icon to the left to view. In 2022, your noxious weed control team began recording noxious weed infestations on iForm to be displayed on this map. Although many infestations noted this year have not yet been uploaded, in addition to missing most historical records, we believe this is a great start to a more manageable and efficient tracking system.


    Weed Control - Dec. 11, 2023, 10:27 a.m.

  3. Spurge Laurel

    Daphne laureola Spurge Laurel - An evergreen shrub that gets to be around 1.5 to 5 feet tall. Plants can either be upright or arched at the base before spreading upwards.Leaves: Leaves alternate and are more prominent towards the top of the shoots. They are dark green and shiny on the top with lighter undersides. Leaves are oval in shape and about 0.8-5.1 inches long.Flowers: Flowers bloom from March through June. Small, green and yellow flowers grow at the base of the leaves and are fragrant.Habitat: Commonly found amongst the forest understory. Spurge Laurel prefers partial sun.Weed Classification: B DesignateWhy …


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

  4. Common Tansy

    Tanacetum vulgare Common Tansy- This pungent perennial grows up to 5' tall and spreads via wind-dispersed seeds, as well as by rhizomes.Leaves: Alternate and pinnately compound, they are deeply divided into toothed segments and become smaller towards the top of the stalk.Flowers: Flowers bloom from July to October. Numerous clusters of button-like yellow flowers that have a flat top and are 1/4 to 1/2 inches wide.Habitat: It is extremely common to find along roadsides, waste areas, stream banks and in pastures.Weed Classification: BWhy is it a Noxious Weed? Because of its aggressive nature and risk of toxicity to livestock. Like …


    Weed Control - Sept. 29, 2022, 9:46 a.m.

  5. Purple Loosestrife

    Lythrum salicaria Purple Loosestrife – Erect squarish stems, up to 8 feet tall, Leaves: 1 ½ to 4 inches long, lance-shaped and lack petioles, usually opposite and rotated 90 degrees from the previous node or whorled in sets of 3.Flowers: spikes of magenta flowers 4 – 16 inches long, flowers from July to October.Habitat: Found in wetlands and streams in the Centralia/Chehalis area as well as Stearns Creek and Mineral Lake in Lewis County.Weed Classification: B designateWhy Is It a Noxious Weed?Purple loosestrife is a vigorous competitor and can crowd out other vegetation including native species. It can quickly dominate …


    Weed Control - Sept. 12, 2022, 11:28 a.m.

  6. Scotch Broom

    Cytisus scoparius Scotch Broom - Everyone's favorite noxious weed! A woody perennial shrub that has many branches. Plants can range from 3-10 feet tall.Leaves: Scotch Broom has few leaves. The upper leaves are simple with the lower leaves being 3 parted. Leaves are pointed at each end and can fall early in the year, leaving bare, green stems.Flowers: Flowers bloom from March through June. Typical pea family flowers in shape. Bright yellow in color with 5 petals.Habitat: Typically, can be found along roadsides, in pastures, grasslands, and open areas with recent soil disturbance.Weed Classification: B SelectWhy is it a Noxious …


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

  7. Himalayan Knotweed

    Persicaria wallichii Himalayan Knotweed - A clumping perennial with hollow stems and creeping rhizomes. It grows about 6 feet in height.Leaves: Leaf shape is elongated compared to other knotweeds and are around 5-12 inches in length. They are leathery and alternate along the stem.Flowers: Flowers bloom from July-October. Whiteish pink flowers that are fragrant grow at the tips of branches.Habitat: Grows in disturbed, moist sites like roadsides, riparian, and wetland areas.Weed Classification: B DesignateWhy is it a Noxious Weed?This plant vigorously grows into dense stands that overtake native vegetation and alter ecosystems. It can survive severe floods and spread plant …


    Weed Control - Oct. 5, 2022, 4:16 p.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. False Brome

    Brachypodium sylvaticum False Brome - A perennial, loosely tufted grass with upright stems.Leaves: Leaf sheathes have spreading hairs (can be hairless). Leaf blades are flat and arched up to 14 inches long. Leave blades are covered with long soft hairs.Flowers: Flowers bloom from April-June. Flowers are grouped in upright to nodding spikes. Flowers vary in hairiness and typically don't have stalks connecting them to main stem.Habitat: Grows in a variety of habitats including: forests, forest edges, woodlands, riparian areas, prairies, and roadsides.Weed Classification: AWhy is it a Noxious Weed?It spreads very fast and outcompetes native flora. Can form dense monocultures …


    Weed Control - Sept. 29, 2022, 10:46 a.m.

  10. Giant Hogweed

    Heracleum mantegazzianum Giant Hogweed - A perennial, or sometimes biennial, plant capable of growing 15-20 feet tall. Stout dark reddish-purple splotched stems and leaf stalks.Leaves: Leaves can grow up to 5 feet wide, and they are deeply cut/lobed and sharply toothed edges.Flowers: Flowers bloom from June-August. Flower clusters can grow 2.5 feet wide and are umbrella shaped with many small white flowers.Habitat: Can grow in a variety of habitats, but primarily found along roadsides, rights-of-way, vacant lots, streams, and rivers.Weed Classification: AWhy is it a Noxious Weed?Due to the plant's height, it forms dense canopies that outcompete native species. Plants …


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