1. Tansy ragwort

    Jacobaea vulgaris Tansy Ragwort - An herbaceous plant that can either be a winter annual, a biennial, or sometimes a perennial. Mowing may cause the plant to grow like a perennial.Leaves: Twice divided leaves, with leaf stems at the bottom of the plant, but a singular, unbranched, stalk towards the top of the plant. First year Tansy will have a basal clump, and afterwards the leaves are alternate.Flowers: Flowers bloom from June - August. Somewhat flat-topped clusters of yellow disk and ray flowers. Flowers have bracts (scales) with black tips.Habitat: Commonly found in open, disturbed areas like roadsides, pastures, fields, …


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

  2. Aquatic Plant Management & Herbicide Permits – An Overview of WSDA & Ecology's Permit Requirements

    Coverage under Ecology’s Aquatic Plant and Algae Management general permit is usually required for chemical treatments to control aquatic noxious weeds, native nuisance aquatic plants, algae and phosphorus. Several changes were made to this permit when it was updated in April 2021. This session will provide an overview of the permit, when coverage is needed or not, the application process, planning on a realistic timeline to get coverage, and monitoring and reporting requirements. Other topics will include related permits from the WSDA, such as the Noxious Weed Control permit, a demonstration of accessing SAW and applying for permit coverage, and details about the Lewis County Noxious Weed Control Board and its programs.


    Weed Control - Jan. 13, 2022, 1:12 p.m.

  3. 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.

  4. 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.

  5. SHINY GERANIUM; small…but not cute!

          The image of reddish stems dotted by small pink flowers makes the low-growing Shiny Geranium look attractive. It is however a weed that is considered noxious and is seriously unwelcomed in urban and rural household gardens and forests.  Why?  Because it thrives anywhere it can get started and will quickly crowd out natural and desired vegetation. One Shiny Geranium plant becomes many as its seeds are forcefully ejected when ripe, giving this annual weed an ability to move up hill and even into crevices of tree trunks and buildings.  Once on the loose, its seeds may also …


    Weed Control - May 16, 2018, 12:41 p.m.

  6. What's in Your Pasture?

    Do you have livestock? Are you isolating at home right now and looking for an excuse to get out of the house? Did you know that toxic weeds don’t give a darn about an occasional hailstorm?That’s right. In these early days of spring, when its still too wet to dig or till or seed or fertilize the pasture, when you’re inside staying healthy and dry, many noxious weeds and toxic plants are getting a jump start on their spring growth. In fact, some of the very first plants to emerge in the pasture are toxic to livestock. When they’ve waited …


    Weed Control - April 3, 2020, 9:11 a.m.

  7. Stewardship Incentive Program

    Introductory materials, offering all the details you need to navigate the process, can be found here:2025 SIP Program: IntroductionPlease review these instructions in their entirety.To apply: 2025 SIP ApplicationPlease complete the form to the best of your ability and submit it back to us via email or paper mail.Our mailing address is: 351 NW North St., Chehalis WA 98532Our office email is weeds@lewiscountywa.govThe SIP's Pesticide License Reimbursement application can be found here:2025 SIP Pesticide License Reimbursement ApplicationResidents may participate in both aspects of the program simultaneously. Acceptance into one will not negatively affect the application status for the other.Note: A …


    Weed Control - March 1, 2023, 4:28 p.m.

  8. Lewis County Noxious Weed Board Meeting Feb 2024

    This meeting will be held at the Lewis County Noxious Weed office, located at 19 SW Cascade ave, Chehalis WA 98532 LCNWCB Feb 5 2024 Quarterly Weed Board Meeting Agenda


    Weed Control - Aug. 2, 2023, 2:53 p.m.

  9. Flowering Rush

    Butomus umbellatus Flowering Rush - An emergent invasive with a very limited distribution in Washington state that can sometimes stay submerged. Can grow up to 5 feet tall.Leaves: - Thin upward growing leaves that often twist when above the surface of the water and reach 3+ feet in length (when plant is emerged and much longer when it is submerged). Leaves have a triangular cross section.Flowers: - Blooms June - September with umbrella shaped clusters of 20-50 flowers that have 3 sepals and three white to deep purple petals.Habitat: - Can appear in a variety of habitats and is often …


    Weed Control - Sept. 12, 2022, 1:31 p.m.

  10. 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.