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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 01/10/2026

For spotted lanternflies, a tree of heaven is the perfect hotel to check in to—and never check out. This invasive plant is a favorite host of the spotted lanternfly, partially because they both come from the same place in Asia. #InvasiveSpecies #PNW #WashingtonState #weeds

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 11/09/2026

Grasses are very hard to identify, even for trained botanists! Take a gander at these pictures of False Brome, Brachypodium sylvaticum, to help you recognize the hairy leaf blades and drooping seed heads of this Class A Noxious Weed, for when it starts showing itself in our forest understories!

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 03/09/2026

Turkish thistle, Carduus cinereus, is a Class A Noxious Weed in Washington State that readily spreads across rangeland and grassland. This negatively impacts native species and livestock forage. #PNW #InvasiveSpecies #Washington #Oregon #Idaho

Photo of 3 slender thistle flowers, with a green bulb of hairy, spiney, bracts below the purple, white, and fuchsia straight feathery petals. Photo by Joe Price, Oregon Department of Agriculture.

Photo of a plant with pink thistle flowers on the ends of slender green, spiney, stems, on a hillside of grass. Photo by Mark Porter, Oregon State Department of Agriculture.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 28/08/2026

Purple loosestrife, Lythrum salicaria, is a Class B Noxious Weed in Washington State. That means it is required for control in many places, but not everywhere! As the negative review says, it is particularly harmful in our wetland habitats! #PNW #ecology #InvasiveSpecies

Photo of a purple flower with text over it saying "Purple loosestrife review" and a screenshot of a fake review from someone named Washington Wetlands saying "Overly competitive with native plants for space, light, and pollinators. Messed around with our function as a wetland. Would not recommend."
Photo by Steve Dewey/Utah State University.
Graphic by Washington Invasive Species Council.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 19/08/2026

In addition to our beautiful native Oregon ash, ash trees are also popular plantings in gardens and along roadsides throughout Washington. The emerald ash borer will put all of these amazing trees at risk! agr.wa.gov/about-wsda/n...

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 12/08/2026

Waterthyme, Hydrilla verticillata, is an aquatic Class A Noxious Weed in Washington State. Brought in as an aquarium plant, it makes a dense mat, which shades out all other aquatic life and impeding recreation. It is a perfect example of why to never dump your aquarium into the wild!

Photo of a hand holding a frilly-looking olive-green plant with many stems and very tiny leaves, above a pond.
Photo by Leslie J. Mehrhoff, University of Connecticut

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 03/08/2026

Garlic mustard, Alliaria petiolata, is a Class A Noxious Weed in Washington, which heavily impacts forest understories. It can be identified by its kidney/heart shaped leaves with wavy to toothed edges, quarter inch white flowers, and its garlic scent! #pnw #InvasivePlants #ecology #foraging

Photo of a plant with wavy toothed edged leaves and clusters of white flowers with 4 petals each.

Photo of a thin green stem with a few long thin seed pods branching off of it and a cluster of white flowers at the top

Photo of a forest floor, covered in kidney to heart shaped green leaves

Photo of a brown stem and bit of root with some green heart shaped leaves at the top and some thin and bulbous seed pods

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 28/07/2026

Clary sage, Salvia sclarea, is a Class A noxious weed in Washington State, which invades rangeland, reducing habitat for native species and livestock. It looks similar, and is closely related to, meadow clary and Mediterranean sage, which are also Class A weeds here! #agriculture #ecology

Photo of a plant with many purple and white flowers growing from a light green stalk. Photo by Stevens County Noxious Weed Control Board.

Close up photo of white and purple flowers, which are shaped like a curved hook on top and a lobed lip on the bottom. The stem is very hairy. Photo by Stevens County Noxious Weed Control Board

Photo of a hillside covered in plants with white and purple flowers. Photo by Stevens County Noxious Weed Control Board

Photo of soft looking leaves with toothed edges, growing in pairs from square stems. Photo by Stevens County Noxious Weed Control Board

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 17/07/2026

Vochin knapweed, Centaurea nigrescens, is a Class A Noxious Weed in Washington State. It looks similar to mountain bluet, Centaurea montana (which is on our monitor list to determine invasive impacts.) Vochin knapweed is known to cause heavy impacts to pasture and natural landscapes. #InvasivePlant

Photo of a plant with a purple-pink frilly flower growing from the top of a green stem. On the bottom of the frilly petals, connecting them to the stem, is a brown-purple bulb that is lightly textured with rough bracts.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 07/07/2026

Floating primrose-willow, Ludwigia peploides, is an aquatic Class A Noxious Weed in Washington. They can form dense mats, choking out any desired aquatic life in any aquatic or riparian environment, especially along the banks. It is very important to not dump your aquarium water in the environment.

Photo of a 5-petaled yellow flower growing from a green stem with deep green, lance shaped leaves. Photo by King County Noxious Weed Control Board.

Photo of a waterway covered in green leaves. Photo by King County Noxious Weed Control Board.

Photo of a 5 petaled yellow flower, growing in water. Photo by King County Noxious Weed Control Board.

Photo of several bunches of similar looking leaves floating in water. An arrow pointing towards the larger leaves says "Ludwigia peploides, floating primrose willow, non native noxious weed" and the arrow pointing towards the smaller leaves says "Ludwigia palustris, marsh primrose-willow, native". Photo by King County Noxious Weed Control Board.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 23/06/2026

Mediterranean Sage, Salvia aethiopis, is a Class A noxious weed in Washington State. It invades dry rangeland and pasture across Eastern Washington, greatly reducing native habitat and livestock forage. It spreads its seeds across a landscape as a tumbleweed. #PNW #livestock #conservation #weeds

Photo of a plant with a large number of white flowers growing from stems branching up and away from lobed green leaves.

Photo of a bunch of fuzzy-looking leaves growing in a rosette around some fuzzy buds. Photo from Yakima County Noxious Weed Control Board.

Photo of a few diamond shaped fuzzy green leaves, with shallow serrations, growing in a flat rosette, right against the ground.

Close up photo of white flowers with 4 lobes, growing from fuzzy green bracts. Photo by Yakima County Noxious Weed Control Board.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 09/06/2026

Eggleaf spurge, Euphorbia oblongata, is a Class A Noxious Weed in Washington State. It easily escapes gardens, and can spread through hay and livestock fields, greatly reducing yield and forage. The sap is toxic to humans and livestock. #Agriculture #livestock #gardening #PNW #conservation

Photo of a plant with red and green stems that have green leaves and yellow flowering parts at the top of the stems.
Photo from Klickitat County NWCB

Close up photo of several yellow-green flowering parts growing from a single light green stem with light green leaves.
Photo from San Juan County NWCB

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 29/05/2026

Goatsrue, Galega officinalis, is a Class A Noxious Weed in Washington. It grows as a large shrub in the pea family, and it invades wetland areas, quickly pushing out native species. It is also toxic to sheep and goats. #InvasivePlants #Weeds #pnw #cascadia #WashingtonState #wetlands #ecology

Photo of a dense amount of plant material. The leaves coming from stems are made up of several oval leaflets each. The flowers are white or purple, and grow in spikes, where several flowers lightly curve away from the main stem.
Photo by Paul Hamidi.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 15/05/2026

Wild four o'clock, Mirabilis nyctaginea, is a Class A Noxious Weed in Washington. An infestation can start out looking like a couple weedy plants, but can quicky spread across hundreds of acres of open areas like rangeland and agriculture fields. #InvasivePlants #Weeds #agriculture #ecology

Photo of the top stem of a plant being held to the camera. The top of the plant has a few pink flowers growing from a clump at the top of the stem.
Photo by Jennifer Andreas.

Photo of a green stem that splits into two green stems, with two green leaves hugging the stems after they split.
Photo by Jennifer Andreas.

Photo of a green stem with a green-pink seed pod growing from the end. The seed pod is round and has wings that go in 4 directions.
Photo by Jennifer Andreas.

Photo of an herbaceous plant growing on a rock-covered ground. The plant is green, with a few leaves and pink flowers growing from the tops of the stems.
Photo by Jennifer Andreas.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 08/05/2026

There are lots of ways to manage invasive plants. When a habitat is infested with a weed species that isn't fire adapted, a controlled burn can help restore habitat. This is not a method for anyone to attempt on their own though, it requires a trained prescribed fire crew! #RXfire #restoration

Photo of a prescribed fire crew member leaving a line of fire through a grassland habitat.
Photo by Anne Schuster

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 01/05/2026

Take a close look at your Scotch broom, it might actually be Spanish broom, Spartium junceum! It has similar impacts to its lookalike, but Spanish broom has smaller infestations in Washington, so we have a chance to eradicate it! (1/2) See next post for ID tips!

Close up photo of some yellow flowers with a round banner petal above a couple bowed petals and a couple petals making a keel shape. Photo by Jennifer Andreas, WSU extension.

photo of a few green shrubs with yellow flowers growing from thin stems at the tops of the bushes. Photo by Jennifer Andreas, WSU Extension

close up photo of green stems and green leaves. The leaves are simple and narrow ovals.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 17/04/2026

Syrian bean-caper, Zygophyllum fabago, is a Class A weed in Washington State. It uses its strong taproot to help invade rangeland and sagebrush areas, where it impacts native species and livestock forage. #pnw #InvasiveSpecies #weeds #habitat #ecology #WashingtonState

Photo of a small white flower growing from a plant with thin green stems and oval shaped green leaves.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 10/04/2026

Texas blueweed, helianthus ciliaris, (named for the blue-ish tone of the foliage, not for the obviously yellow flower!) is native to Texas and the SW United States. However, its natural range does not reach Washington, and it is a Class A Noxious Weed here, due its impacts on agriculture!

Photo of a thin sunflower head with yellow petals, which are actually ray flowers.
Photo by Richard Spellenberg.

Photo of a group of thin yellow sunflowers growing in a dirt field.
Photo by Richard Spellenberg.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 02/04/2026

April is Native Plant Month! Controlling noxious weeds helps make way for our beautiful native plants to come back to Washington's habitats. Planting native species can also hold the ground against weeds while helping our natural resources. #NativePlants #PNW #Spring #BloomScrolling #Biodiversity

Photo of a field of purple (Collinsia grandiflora), pink (Armeria maritima), and yellow (Ranunculus occidentalis) flowers with a forest of trees in the distance. Photo taken at Wolf Haven International's Patrick Vance Dunn Memorial Prairie, by Anne Schuster.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 26/03/2026

Purple starthistle, Centaurea calcitrapa, is a spiny invasive plant related to thistles and knapweeds. It aggressively invades grassland areas, and is unpalatable to livestock and wildlife. It also hinders recreation, would you want to walk through those sharp spines? #InvasiveSpecies #pnw

Photo of a green plant with magenta flowers. There are sharp spines on the bracts just below the frilly petals of the flowers. The leaves are lightly curled and thin.
Photo by Malcom Storey, BioImages Visual Field-Guide, Bugwwood.org

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 19/03/2026

It is national agriculture week! We work closely with Washington State Department of Agriculture and countless other partners across the region to help manage weeds. #agriculture #pnw #forestry #livestock #InvasiveSpecies #weeds

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 19/03/2026

Our webpage on sunflower broomrape is now up and running with more information on his damaging parasitic plant: www.nwcb.wa.gov/weeds/sunflo...

nwcb.wa.gov

Washington State Noxious Weed Control Board

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 15/03/2026

Sunflower broomrape, Orobanche cumana, is now a Class A Noxious Weed in Washington. We only know of one infestation site, but it could be elsewhere! Help us keep an eye out, in the summer look out for a fuzzy, ghostly asparagus looking plant near sunflowers, tomatoes, tobacco, and sage! #PNW

Illustration of a tan and purple flowering plant with an x-ray view into the soil to see that the roots of this plant are stealing nutrients from a larger green plant.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 05/03/2026

Governor Ferguson has proclaimed March to be Washington Agriculture Month! Help us protect #agriculture in #Washington by removing noxious #weeds, planting non-invasive plants, using #herbicide responsibly, and reporting noxious weeds to your local county weed board.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 25/02/2026

Come visit us at the Washington State capitol building Invasive Species Awareness Week and get some free publications like our Garden Wise or field guide booklets! #WashingtonState #ISAW #InvasiveSpecies #Gardening #Agriculture #PNW #Weeds

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 19/02/2026

There is still time to register for any of the Washington Invasive Species Council's webinars next week! Each webinar will give free WSDA pesticide recertification credits too. Come visit us at the capitol building on February 24th-26th! invasivespecies.wa.gov/projects/inv... #pnw

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 13/02/2026

We are working with the Washington Invasive Species Council on Invasive Species Awareness Week again! Join a free webinar from February 23rd to 25th or visit us at the capitol building from February 24th to 26th! invasivespecies.wa.gov/projects/inv... #WashingtonState #isaw #InvasiveSpecies

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 05/02/2026

Delta arrowhead, Sagittaria platyphylla, is now a Class A Noxious Weed in Washington State. This beautiful aquatic plant can heavily impact wetland areas and irrigation as it spreads throughout aquatic systems. www.nwcb.wa.gov/weeds/delta-... #AquaticPlants #InvasiveSpecies #PNW

Photo of lance-shaped green leaves growing out of water with a few white flowers growing from a stem at the center of the image. Each flower has 3 round white petals and green centers.

Photo by Wesley Glisson.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 27/01/2026

Norway maple, Acer platanoides, is now a Class C Noxious Weed in Washington. This popular street tree takes a while to start to impact forests, but when it reaches sexual maturity they quickly outcompete native understory plants. www.nwcb.wa.gov/weeds/norway... #pnw #invasiveplants

photo of two leaves and several maple seed "helicopters" on a black background. Arrows pointing to the leaf tips say "sharp pointed lobes", arrow pointing to the leaf stem says "milky sap", and arrow pointing to the helicopter-shaped seed says "Glabrous (not hairy)"
Photo by Oregon State University

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 14/01/2026

Black locust, Robinia pseudoacacia, is a common shade tree in Washington, but they readily infest grassland habitats. They are now a Class C noxious weed, which means you can keep your tree when you want it, but makes it easier for groups to get permission for removal when needed.

Photo of a drooping branch with bright green, oval-shaped leaves around a cluster of white pea flowers.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 09/01/2026

Waterhemp, Amaranthus tuberculatus, is a new Class A Noxious Weed in Washington for 2026. It has very similar impacts to agriculture as it's relative, Palmer amaranth. Neither are known in Washington currently, but we want to keep it that way! www.nwcb.wa.gov/weeds/waterh...

Photo of two green flowering stalks, one with spikes of brown-red inflorescences, and the other has green inflorescence spikes. The flowers are not showy, and you would not think they are flowers if you didn't already know that.
Photo by Christophe Bornand

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 31/10/2025

Delta arrowhead is just 1 of 4 species up for listing discussion at our public hearing on Tuesday November 4th. Other species are waterhemp, black locust, and Norway maple. See our website (www.nwcb.wa.gov/whats-new) for information on how to provide testimony before or at the hearing. #invasive

Image of a hand holding a plant with a bright green stem and white flowers, above its pond habitat.

Photo by Wes Glisson

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 19/09/2025

Palmer amaranth, Amaranthus palmeri, is a weed that causes massive losses to crop yields. It was recently found in certain Safeway bird seeds. These bags are now being recalled! See WSDA's news release for more information: agr.wa.gov/about-wsda/n... #pnw #agriculture #birds #invasiveplants

Photo of a green leafy plant on top of blocks of text, which read: News Release. Washington and Oregon issue recall for wild birdseed containing invasive quarantined weed seeds. Read the news release at agr.wa.gov . Washington State Department of Agriculture.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 11/09/2025

Check out these model junior weed warriors! Spotted at the haul-out for kayaks going down the Deschutes River in Oregon, these two young ladies had recently harvested three bags of invasive knapweed. We absolutely love when the next generation helps spread the word about invasive species!

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 02/09/2025

Silverleaf nightshade, Solanum elaeagnifolium, is a rare Class A noxious weed in Washington. It is toxic to eat, and causes a lot of negative impacts to crop yields. If you see it, report it to your county weed board! #pnw #agriculture #invasiveplants

Close up photo of a star-shaped purple flower with 5 yellow stamens in the middle.

Photo of many silvery-green plants growing amongst brown grass.

Photo of a yellow cherry tomato-looking berry growing on a silvery-green stem with silvery-green leaves.
Photo by Joseph M DiTomaso, University of California - Davis.

Photo of a purple star-shaped flower with 5 yellow stamens in the center, growing on the top of a lightly spiny silvery-green stem with silvery green leaves that also have a few small spines.
Photo by Joseph M DiTomaso, University of California - Davis.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 29/08/2025

Bighead knapweed, Centaurea macrocephala, is probably our most recognizable invasive knapweed species. It has big, rounded, yellow flowering heads, and can grow over 5 feet tall! It can grow in and impact a open areas throughout the state, from croplands to sub-alpine meadows. #PNW #InvasivePlants

Photo of a leafy green plant with several large, yellow flowers growing at the top of its branched stems.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 22/08/2025

There are 4 species of Spartina on our noxious weed list. All invade our intertidal and salty estuary areas. They clone very well, pushing out native species, and impacts our delicate coastal wetlands. Eradication is difficult and expensive, so prevention is the best method! #PNW #coastal #invasive

Photo of dense flowered cordgrass, Spartina densiflora, growing in a muddy estuary. The grass is tan and growing in tight bunches across the tide flat. Photo by Chad Philips.

Photo of a hand holding some green seeding stalks of common cordgrass, Spartina anglica. Photo by Chad Philips.

Photo of a brown flowering stalk of saltmeadow cordgrass, Spartina patens, held up against a white background. Photo by Chad Philips.

Close-up photo of a round brown stem, where the leaf blade attaches, of smooth cordgrass, Spartina alterniflora.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 13/08/2025

Dyer's woad, Isatis tinctoria, can be used to make an indigo-colored dye. It escaped cultivation and can be found pushing out desired plants in open and forested areas. It is allelopathic, meaning it changes the soil to make other plants growth more difficult. #invasivePlants #pnw #conservation

Photo of a plant with long green stalks and a mass of small yellow flowers on top, growing in a grassy field.

Close up photo of tiny yellow flowers on very tiny light green stalks.

Photo of the underside of a light green leaf growing from a stalk.

Photo of a cloud of tiny yellow flowers, with thin green stems out of focus behind them.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 08/08/2025

Ricefield bulrush (Schoenoplectus mucronatus) is an invasive wetland plant, which is especially bad for rice fields (very surprising with that name!) especially because of its herbicide resistances. It is very close to being eradicated in Washington! #agriculture #wetlands #pnw #invasivePlants

Photo of a grass-looking plant with a bundle of cone-shaped inflorescences coming from the triangular stem.

Photo of a grass-looking plant, which is growing in an open wet area.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 31/07/2025

Meadow clary, Salvia pratensis, is a Class A noxious weed in Washington State. It invades rangeland and sagebrush steppe in Eastern Washington, outcompeting native plants and reducing forage for wild animals and livestock. #InvasiveSpecies #PNW #weeds #agriculture #cattle #environment

Close up photo of several tiny purple stems covered in small purple flowers, with green leaves in the background.
Photo by Larry Hudson, Okanogan County Noxious Weed Control Board

Zoomed out photo of the plant from the other pictures, showing the green to green-yellow leaves and long stems covered in small purple flowers, growing in a rocky open area.
Photo by Larry Hudson, Okanogan County Noxious Weed Control Board

Zoomed in photo of the leaves of the plant from the other pictures. The leaves are green, have rounded teeth around the edges, and look slightly wrinkled.
Photo by Larry Hudson, Okanogan County Noxious Weed Control Board.

Photo of the flowers from the other pictures, with a blue sky behind them. The flowers are slightly older and a lighter purple than the other pictures.
Photo by Larry Hudson, Okanogan County Noxious Weed Control Board.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 23/07/2025

Our partners at the Washington Invasive Species Council have a big update on their app for reporting invasive species! Be a citizen scientist and help Washington protect our natural treasures by reporting invasive species when you see them! invasivespecies.wa.gov/report-a-sig... #PNW #ecology

Photo of someone holding a phone with an image of an invasive insect, the Spotted Lantern Fly, on the screen. Text reads "Exciting new update for our app! For both Android and iOS! Check it Out!

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 17/07/2025

Common Ivy (Hedera helix & H. hibernica) have been on Washington's Noxious Weed List since 2002. They are now on our prohibited plants list too! That means they are no longer allowed to be sold here! To learn more about the listing process: kingcountyweeds.com/2023/10/18/n... #PNW #invasiveplants

Photo of a hillside of common ivy, with the trees at the top completely strangled by the ivy climbing up them.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 09/07/2025

Orange peel clematis, Clematis orientalis, is a vine that has the potential to be the Kudzu of the Pacific Northwest! The only known infestations of it are in Yakima county and are currently well on their way to being eradicated. Help us keep Washington orange peel clematis free by reporting it!

Photo of a yellow flower with 4 large petals and several stamens around the center. In the background are a tangle of green vines and narrow leaves.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 03/07/2025

Kudzu, Pueraria montana var. lobata, is also known as the weed that ate the south. The few times it has been found in Washington it has luckily been found and eradicated. Help us keep Washington kudzu free by keeping an eye out and reporting if you see it! #pnw #invasiveplants #edrr

Photo of a conical bundle of several bright pink pea flowers with yellow spots.

Photo of several bright green leaves. Each is shaped like a duck's foot.

Photo of a huge amount of vines climbing and strangling a tree.

Photo of the pink flowers from the first image in this set, next to the duck-foot-shaped leaves from the second photo.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 20/06/2025

Texas blueweed, Helianthus ciliaris, is a small sunflower with a blue-ish hue to the leaves and stems. Though it is native to parts of North America, it is invasive in Washington, where it particularly impacts agriculture. #PNW #InvasiveSpecies #sunflowers #botany

Close up photo of a small sunflower, with bright yellow ray flowers making the petals around a dark red circle of disk flowers.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 11/06/2025

Thistles can be difficult to tell apart! Slenderflower thistle (Carduus tenuiflorus), a Class A Noxious Weed, are VERY spiny, tall, and have relatively small flower heads while also producing many flower heads on the top of each spiky stem. They degrade open grassy and pasture areas. #PNW #Invasive

Photo of a very spiny plant with many frilly pink flowers clustered at the tops of spiny stems, standing in a green field.
Photo by Thurston County Noxious Weed Control Board

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 06/06/2025

In Washington it is illegal to transport invasive species, even by watercraft! For Clean, Drain, Dry Week, learn how to clean your watercraft between sites and protect Washington from invasive aquatic plants like Eurasian Watermilfoil. invasivespecies.wa.gov/campaigns/cl... #boating #kayaking #PNW

Photo of a frilly plant that is fully submerged underwater. Each stem is long, thin, and flowing.

Photo of the same frilly plant, this time laid on a dry white background. The stem is long and thin.

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 28/05/2025

There are 3 species of invasive jewelweed on our noxious weed list, but there are also several native species of jewelweeds! Jewelweeds like to grow in wet areas, so check out your local wetland or riparian area for these species. #PNW #invasivespecies #botany #conservation #habitat #biology

Infographic on how to identify different species of jewelweed.

The left column of images images are of bright yellow trumpet-shaped flowers, labeled "Native species. Impatiens aurella, pale yellow touch me not. Impatiens ecornuta, spurless touch-me-not. Impatiens noli-tangere, Western touch-me-not."

The right column is labeled "Non-native species" and starts with an image of a pink trumpet shaped flower labeled "Class B: Impatiens gladulifera, policeman's helmet"
a pale yellow cone/trumpet shaped flower labeled "Class A: Impatiens parviflora, small-flowered touch-me-not"
a pink and white trumpet-shaped flower labeled "Impatiens balfourii, Kashmir balsam"
and a dark yellow and orange trumpet-shaped flower labeled "Class C: Spotted jewelweed, Impatiens capensis"

There are arrows pointing from the spotted jewelweed and the spurless touch-me-not and pointing to text that says "Hybrid Impatiens x pacifica".

Photos by Peter Zika

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Washington State Noxious Weed Control Board @wastateweedboard.bsky.social · 20/05/2025

Happy World Bee Day! While weed flowers can provide for pollinators, native plants can support a larger diversity of insects, including over 600 native Washington bee species! #WorldBeeDay #agriculture #gardening #forestry #biodiversity #nativeplants

Macro photo of a fluffy yellow and black bumblebee on a bright yellow sunflower.

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