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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.
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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.
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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.
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Yellowflag Iris
Iris pseudacorus Yellowflag Iris - A perennial, herbaceous, aquatic plant, growing 2-3 feet in height.Leaves: Basal leaves are sword shaped and larger than the leaves found higher up the stem.Flowers: There can be few or many flowers near the tip of the stems. Flowers are white-dark yellow with purple markings. There are 3 petals and 3 sepals.Habitat: Most commonly found growing in very shallow water or mud. It can also grow along lake shores and slow-moving rivers. It tolerates a variety of conditions.Weed Classification: C SelectWhy is it a Noxious weed?It is an ornamental that has become a nuisance in …
Weed Control - Oct. 6, 2022, 11:46 a.m.
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Noxious Weed Board
Mission Statement:It is the mission of the Noxious Weed Board to serve as responsible stewards of Lewis County land and agriculture, and to protect and preserve our ecological resources against the harms of noxious weeds. We endeavor to develop programs that reflect local priorities, meet the needs of county landowners and residents, and carry out the mandate of the Washington State noxious weed law, the RCW 17.10. The county Noxious Weed Control Program provides consultation on weed prevention strategies, educational programming, technical assistance, enforcement actions, and a variety of other resources to help control or eradicate noxious weeds in our …
Weed Control - Jan. 23, 2019, 4:12 p.m.
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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.
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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.
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Oxeye Daisy
Leucanthemum vulgare Oxeye Daisy - A perennial, herbaceous plant growing 1-3 feet tall.Leaves: Leaves are alternate and lance-shaped, with toothed or lobed edges.Flowers: Flowers bloom from May-October. Single flowerhead at the end of the stem. It has many white ray-flowers, creating the "petals," and yellow disc-flowers in the middle.Habitat: Found in grasslands, overgrazed pastures, waste areas, meadows, roadsides, railroad ROWs, yards, and fields.Weed Classification: CWhy is it a Noxious Weed?It can aggressively invade fields and decrease plant diversity. It decreases crop yield and has rhizomes with adventitious roots.Oxeye Daisy is very common in Lewis County. It can be hard to …
Weed Control - Oct. 6, 2022, 9:32 a.m.
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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.
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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.