1. 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.

  2. Yellow Flag Iris

    Iris pseudacorus Yellow Flag Iris - Perennial invasive ornamental that grows 2-3 feet tall, is considered toxic to herbivores and contains a skin-irritating sap.Leaves: Broad, flat sword-shaped basal leaves that reduce in size going up the stemFlower: Multiple flowers appear at stem terminals, can be pale to dark yellow, have 3 sepals and 3 petals with its petals shorter than its sepals. Blooms visible May - July.Habitat: Grows in wetlands along the margins of lakes and slow moving rivers. It is most commonly found in shallow water or mud such as those in wet ditches.Weed Classification: C SelectWhy is it …


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

  3. Survey

    Functions include but are not necessarily limited to:Survey - Responsible for all aspects of surveying for County roads and bridges.Maintain and update the County Control Network utilizing GlobalPositioning System (GPS) and conventional survey methods. Providesurvey support for all other County departments.Construction - Provide preliminary and construction surveying for all County road andbridge construction projects. Utilize survey personnel as project inspectors. Monument existing Right-of-Way center lines on theconstruction projects.


    Public Works - Sept. 16, 2021, 11:02 a.m.

  4. Parrotfeather

    Myriophyllum aquaticum Parrotfeather - An escaped ornamental that is submerged until it grows long enough to reach the surface where it will then have emergent leaves. This plant has a unique highly hydrophobic property that allows its leaves to hold bubbles of air.Leaves: Featherlike with whorled formation of 4 to 6 leaves. The subsurface leaves are darker than the emerged leaves which are bright green and resemble little fir tree seedlings.Flowers: Inconspicuous whitish flowers found at the leaf axils of emerging stems during summer months.Habitat: Found in freshwater ponds, streams, lakes and rivers. Tends to be rooted in shallow muddy …


    Weed Control - Sept. 26, 2022, 11:33 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.