1. 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.

  2. Yellow Toadflax

    Linaria vulgaris Yellow Toadflax - A perennial growing 8-31 inches tall from creeping roots. Forms colonies.Leaves: Many narrow, linear leaves up to 4 inches in length, alternating along the stem.Flowers: Flowers bloom from June-September. Many flowers crowd the top 2-9 inches of the plant. Flowers are yellow, hairy, and have orange "throats." Resembles snapdragons.Habitat: Grows in a variety of habitats, including: roadsides, edges of fields, rangelands, meadows, cultivated fields, and waste areas.Weed Classification: CWhy is it a Noxious Weed?It can easily invade range and farmlands outcompeting desirable crops/forage. Livestock will rarely eat the plant.Yellow Toadflax can infest cultivated land easily, …


    Weed Control - Oct. 6, 2022, 9:33 a.m.

  3. Common fennel

    Foeniculum vulgare Common Fennel - A large perennial herb that grows to be about 6' tall, smells strongly of licorice, and spreads via seeds and pieces of the root crown.Leaves: Dark green or bronze feather-like, deeply lobed and somewhat spindly, the leaves are completely hairless and attachment points (petioles) are fleshy with a wide base.Flowers: In bloom from May to September, the small yellow flowers form an umbrella shaped cluster (umbel) and resemble those of poison hemlock and wild chervil.Habitat: Can establish in just about any habitat from roadsides, to prairies, to coastal bluffs, to wetland areas.Weed Classification: B DesignateWhy …


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

  4. Italian Arum

    Arum italicum Italian Arum - Perennial, herbaceous plant that grows from tubers. Multiple tubers will be produced during growing season.Leaves: Leaves emerge in the fall-winter and will die back in the summer. Leaves are arrowhead-shaped, green, and possibly has cream or silver-gray colored veins and markings. Young leaves are generally more oval in shape.Flowers: Flowers bloom from April-June. Made up of a spathe and spadix, and grow into many red-orange berries in a cluster.Habitat: Normally found in forest understudies, riparian areas, wetlands, old gardens, woodland gardens, and disturbed areas near urban developments.Weed Classification: CWhy is it a Noxious Weed?It is …


    Weed Control - Oct. 6, 2022, 9:33 a.m.

  5. Bull Thistle

    Cirsium vulgare Bull Thistle - Biennial, herbaceous plant growing about 3-7 feet tall, with one stem.Leaves: Alternate, coarsely lobed leaves. Each lobe has a spiked tip. Top of leaves is rough with small spines, while the bottom has wooly hairs.Flowers: Flowers bloom from July-September. 1.5-2 inches across and are generally purple/pink (rarely white).Habitat: Primarily found in disturbed areas like pastures, roadsides, ditch banks, hayfields, prairies, and logged mountain areas.Weed Classification: CWhy is it a Noxious Weed?Bull Thistle tends to outcompete native vegetation and desired grazing forage.Bull thistle is commonly found in Lewis County. If you need control recommendations, please see …


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

  6. Policeman's Helmet

    Impatiens glandulifera Policeman's Helmet - An herbaceous annual that is smooth and hairless. It can range from 3 - 10 feet tall.Leaves: Usually 3 leaves per node and are usually alternate, opposite, or whorled. Leaf shape is oblong to ovate to elliptic. About 6 inches long and sharply toothed margins.Flowers: Flowers bloom from July to September. Irregular flowers that are shaped similar to a British policeman's helmet. Color ranges from white to many shades of pink. Flowers have 5 petals (2 fused), 3 sepals (2 fused), and 5 stamens.Habitat: Partially shade tolerant. Found in lowland, riparian habitats such as moist …


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

  7. Buffalobur

    Solanum rostratum Buffalobur - An annual plant growing around 1.5-3 feet tall, covered in spines and hairs.Leaves: Alternate leaves 2-6 inches long. Leaves are irregularly cut into 5-7 lobes and are very prickly.Flowers: Flowers bloom from June-September. 3-15 flowers per flower cluster. Flowers are bright yellow, 5 lobed, flat, and circular shaped about an inch across.Habitat: Found in fields, overgrazed pastures, yards, road sides, waste areas, barn yards, it can grow in sandy soil, dry soil, and rich moist soil.Weed Classification: CWhy is it a Noxious Weed?Buffalobur is toxic to livestock, and spreads easily in pastures and fields outcompeting desired …


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

  8. Shiny Geranium

    Geranium lucidum Shiny Geranium - A small, annual or biennial herbaceous plant with basal, lobed, shiny leaves. Usually has reddish stems.Leaves: Rounded/kidney-shaped leaves. Leaves are divided into lobed sections that each have 3 lobes at the tip. Leaf stems have hair on one side.Flowers: Flowers bloom from April-June. Flowers are pink with 5 petals each. Each flower has 5 slightly expanded sepals.Habitat: Plant grows well in shaded woodlands and forest openings. Plant can also tolerate partial and full sun. May be found alongside Herb Robert.Weed Classification: B DesignateWhy is it a Noxious Weed?Shiny Geranium spreads aggressively and has moved into …


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

  9. Butterfly Bush

    Buddleja davidii Butterfly Bush - A profusely spreading deciduous shrub that was a popular ornamental and is now found throughout western Washington. The bush can reach 15' in height and has tall arching branches.Leaves: Usually 4-10 inches long and 1-3 inches wide, with toothed edges and opposite arrangement on the branch. The upper surface of the leaf is a deep green while the underside appears whiteish due to a dense covering of short fuzzy hair.Flowers: Flowers bloom from June-October. Showy spikes at the branch terminals can be 4 to 10 inches long. The small flowers are 4 petaled, bell-shaped and …


    Weed Control - Sept. 29, 2022, 9:45 a.m.

  10. Oriental Clematis

    Clematis orientalis Oriental Clematis - A moderately vigorous, climbing shrub that forms a mass of stems and grows upwards of 27 feet long.Leaves: Opposite on stems, pinnately compound with 5-7 leaflets.Flowers: Flowers bloom from June-December. Can be single flowers or flower clusters. Generally, they have 4 yellow/green sepals that look like petals.Habitat: Found in gullies, riverbanks, streambanks, roadsides, open woods, steep hillsides, and irrigation canals.Weed Classification: AWhy is it a Noxious Weed?Can establish in a variety of habitats and forms dense infestations which can kill small plants and trees. Can be extremely difficult to control, once established.Clematis can be found …


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