![]() We map all known locations of regulated noxious weeds such as purple loosestrife in order to help us and others locate new infestations in time to control them. Our program staff can provide the property owner or appropriate public agency with site-specific advice on how best to remove it. Please notify us if you see purple loosestrife growing in King County. What to do if you find this plant in King County, Washington Washington State Noxious Weed Control Board (external link).Purple Loosestrife Weed Alert (144 kb, Acrobat file).Additional information on purple loosestrife For more information on noxious weed regulations and definitions, see Noxious weed lists and laws. It is further prohibited to intentionally transplant wild plants and/or plant parts of this species within the state of Washington. This species is also on the Washington quarantine list (known as the prohibited plants list) and it is prohibited to transport, buy, sell, offer for sale, or to distribute plants or plant parts of this species, into or within the state of Washington. Purple loosestrife folleto informativo (informaci ón sobre identificaci ón y control) (pdf 969 Kb) Legal status in King County, WashingtonĬlass B noxious weed. Control is required in King County. Because of the impacts to fresh and brackish wetlands across the nation, purple loosestrife is targeted for control and is found on many noxious weed lists throughout the country including Washington State. It has also been repeatedly and continually introduced as a garden plant. ![]() Purple loosestrife is native to Europe and Asia, and was initially introduced to the northeastern seaboard of the United States in the ballast of ships in the 1800's. This plant spreads by seed and root fragmentation. Plants can produce over two million seeds the size of ground pepper. Purple loosestrife is a long-lived wetland perennial that can reach over 9 feet tall. Purple loosestrife's appearance is similar to fireweed and spirea and is sometimes found growing with garden loosestrife along King County's lakeshores and wetlands. In winter months, dead brown flower stalks remain with old seed capsules visible on the tips. Purple loosestrife has square stems, which help to tell it apart from some of the look-alikes that grow in the same areas. The flowers are magenta, and they are found on tall, narrow spikes from July to October. Purple loosestrife is typically found invading lakeshores, wetlands, ponds, and wet pastures and ditches. This weed also spreads via its woody taproot, rhizomes, and vegetative growth. In July-September, tall spikes of tiny, 5-7-petaled, magenta flowers appear at stem ends, eventually dispersing up to 2.5 million pepper-sized seeds. Simple, smooth-edged leaves grow opposite or whorled on stiff, 4-6-sided stems. Purple loosestrife, a regulated Class B noxious weed, is a 6-10-foot-tall perennial that grows on lakes and waterways throughout King County.
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