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

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

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!

Noxious weeds that are highly impactful to agriculture, waterhemp and Palmer amaranth, have been found in most bird seed bags. These seeds can survive being digested by birds, and greatly lower crop yields in infested fields. growiwm.org/crisis-at-th... #agriculture #birds #InvasiveSpecies

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

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!

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

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

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

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

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

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.

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

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

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

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

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

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.

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...

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

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

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!

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

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

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

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

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

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

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

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

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!

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

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

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

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

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

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

Visit us, and lots of other organizations, on Wolf Haven International's prairie this Saturday, May 17th! Learn about South Puget Sound prairies, endangered species, habitat restoration, and get exclusive access to a beautiful trail surrounded by flowers. wolfhaven.org/events/ #PNW

Common crupina (Crupina vulgaris) is a Washington State and Federally listed noxious weed. Their stems are inedible to livestock and wildlife, so they greatly degrade habitat and pasture when they form large infestations. These infestations also cause erosion. #invasivespecies #ecology #ranching

The Washington Invasive Species Council is holding the first ever Puget Sound Invasive Species and Exotic Pest Workshop. This will be a valuable opportunity for professionals and the interested public to network, cross-train, and learn from their peers. Info: invasivespecies.wa.gov/event/puget-...

We are holding a free hands-on herbicide training course! It will be at the beautiful Lakewold Gardens on May 13th. Attendees can get 5 WSDA herbicide recertification credits. We only have room for 13 more people in the room, so register now! forms.gle/sudTX15VVGJs... #washingtonstate #workshop

Poison hemlock (Conium maculatum), the plant that was used to kill Socrates, is in its rosette stage right now! That means it is the perfect time to use gloves to pull up the whole taproot! #invasivespecies #invasiveplants #noxiousweeds #toxic #poison #botany #livestock #gardening

Biocontrols are organisms (often insects) that help recreate part of an invasive species natural enemies from their original range. They are great options where weed control is difficult and not all weeds have biocontrols. #biocontrol #InvasiveSpecies #entomology #botany #ecology #weeds

It is National Agriculture Week! Many Noxious Weeds, like Dalmatian toadflax (Linaria dalmatica) cause a lot of harm to agriculture. They invade fields, outcompete crops, and require time and resources to manage. Help protect Washington's farmers by controlling noxious weeds whenever you can!

Come visit us at the Washington State Capitol Building for Invasive Species Awareness Week, and get some free native Washington plant seeds! Also see WSDA's great invasive insect displays and Washington Invasive Species Council's display. #invasivespecies #scicomm #agriculture #weeds #conservation

We are again holding a hearing to consider changes to the state weed list. The only species being considered at this hearing is common holly. To find out how to attend, testify, or learn more about our past work on this subject, see our What's New page! www.nwcb.wa.gov/whats-new

This is the time of year (until April 30th) when we take proposals from the public for additions and changes to the Washington State Noxious Weed List! For more information: www.nwcb.wa.gov/get-involved #invasiveplants #agriculture #conservation #botany #washingtonstate #pnw

Round leaf bittersweet (Celastrus orbiculatus) is the other new Class A that was added to our 2025 Noxious Weed List. This is the perfect time of year to look for their berries in #Washington 's forests, to remove the plant! For more information: www.nwcb.wa.gov/weeds/round-...

As of tomorrow, Marsh thistle (Cirsium palustre) will officially be on Washington's Noxious Weed List. It will be a class A weed, which means it is required for eradication whenever found. For more information: www.nwcb.wa.gov/weeds/marsh-... #botany #invasivespecies #thistle #WashingtonState #pnw