1. 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.

  2. 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.

  3. Canada Thistle

    Cirsium arvense Canada Thistle - A rhizomatous, perennial, herbaceous plant that grows 2-5 feet tall, usually branching only near the top of the plant.Leaves: Leaves are alternate and lance to narrowly oval in shape, possessing short spines along the leaf edges.Flowers: Flowers bloom from May-October. Many flowerheads clustered towards the tip of the stem, purple to pink in color.Habitat: Common in pastures and croplands. Can also invade wet areas as well like steam banks, sedge meadows, and wet prairies.Weed Classification: C SelectWhy is it a Noxious Weed?Once established, it can spread vigorously and replaces native plants. It also lowers crop …


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

  4. Kudzu

    Pueraria montana var. lobata Kudzu - A perennial trailing or climbing vine. It grows at a very fast rate and can easily take over an area if left unchecked.Leaves: Alternate and compound leaves with three oval shaped leaf sections.Flowers: Flowers bloom from May-June. Purple to reddish purple flowers clustered along a center stem that grows about a foot long. The flowers are similar to pea flowers and are fragrant.Habitat: Well drained eroded or degraded land or sandy loam soils in full sun.Weed Classification: AWhy is it a Noxious Weed?A highly aggressive plant that smothers anything in its path. It can …


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

  5. Common Catsear

    Hypochaeris radicata Common Catsear - A perennial with a basal rosette of leaves, followed by upright/slightly bent stems that are usually leafless in its second year.Leaves: Leaves are rough and hairy, with lobed or waxy margins. Leaves can be 1.2-13.8 inches long and .2-2.8 inches wide.Flowers: Flowers bloom from May-October. Dandelion-like flowers that are yellow and disc like and are 1-1.5 inches across.Habitat: Common Catsear grows in disturbed areas, such as yards, roadsides, pastures, waste areas, gardens, and seed fields.Weed Classification: CWhy is it a Noxious Weed?It is a potentially poisonous, aggressively spreading plant that invades lawns and lowland pastures. …


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

  6. Reed Canary Grass

    Phalaris arundinacea Reed Canarygrass - A highly variable perennial plant, with rhizomes. Grows 3-6 feet in height.Leaves: Leaf blades are flat and smooth. The leaf has a wide connecting point to the stem.Flowers: Flowers bloom from June-July. Densely clustered flowers in panicles. 3 florets per spikelet and only one fertile spikelet. Flowers start out green-purple and change to tan/brown overtime.Habitat: Usually grows where ground is at least somewhat saturated during growing season. Habitats include: roadside ditches, river dikes, shallow marshes, wetlands, and meadows.Weed Classification: CWhy is it a Noxious Weed?A major threat to wetlands due to its aggressive nature. It …


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

  7. 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.

  8. 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.

  9. 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.

  10. Wild Carrot

    Daucus carota Wild Carrot - An upright, taprooted herb that grows about 1-4 feet in height. Can be an annual, a short-lived perennial, or a biennial.Leaves: Leaves are thin and fern-like. Leaf segments are lance or linear in shape with toothed edges.Flowers: Flowers bloom from June-September. Flowers are in flat topped umbels and are small and white. The very middle of the umbel can have purple/darker flowers making it look like a black spot in the middle.Habitat: Commonly found in meadows, pastures, roadsides, waste areas, and yards.Weed Classification: C SelectWhy is it a Noxious Weed?It can spread easily and outcompetes …


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