Why the heck would anyone buy an aggressive weed that can't be controlled? Garden loosestrife (Lysimachia vulgaris), a Class B noxious weed from Eurasia, has managed this impressive takedown. They are quite easy to find as their silver/grey coating … Become a certified small business contractor or supplier, Find certified small business contractors and suppliers, Garden Loosestrife Best Management Practices, Washington State Noxious Weed Control Board. The trouble with trying to get rid of Canada Thistle lies in the extensive root structures the invasive weeds extend into the soil. With all three methods, make sure to bag the plants—being careful not to disperse any seeds—and throw all fragments in the trash, not the compost. Yellow loosestrife’s flowers are more pointed than those of garden loosestrife. One example is gooseneck loosestrife (Lysimachia clethroides), a terribly invasive plant in its own right. Yellow Loosestrife Species Lysimachia punctata. Many plants require only … Garden loosestrife displaces native vegetation along streambanks, wetlands and shorelines and reduces habitat needed by waterfowl and fish, including several important salmon species.Although garden loosest… In the distant past these and several other kinds of ‘loosestrife’ plants were also used to get rid … This product comes with a hand held sharpener, a 25 foot polypropylene rope and folds up for easy storage. Garden loosestrife’s flowers appear in clusters at stem ends. Education Specialist Sasha Shaw holds a garden loosestrife plant on the Raging River. They can reroot if you leave them behind. Yellow Loosestrife is generally not subject to serious pest or disease issues. Garden loosestrife’s 5-petaled, yellow, primrose-like flowers appear in clusters at stem ends between July and September. Pests and diseases cause harm to the plant. But only in two states, Washington and Connecticut, is the plant disruptive enough to be designated a “noxious weed.” This may be because the colder winters in some of these states help to keep garden loosestrife populations in check. Garden loosestrife infestation at Marymoor Park on Lake Sammamish. Reproduces by seed and vegetatively, with rhizomes up to 15 feet long. Run a sprinkler or drip system for 20 minutes to a half hour every 5 to 7 days when rainfall is sparse. For the most part, digging is only practical for individual plants or small infestations. Property owners in King County are required to control this plant. Garden loosestrife is easiest to identify when it flowers in July and August. Prescribed Burning Burning is thought to not be an effective control method because purple loosestrife is typically found in a wet soil condition and the rootstock of the plant is well-protected. It is characterized by dense and woody growth which hinders access to the pond. Garden loosestrife was introduced to North America from Europe as an ornamental in the 1900’s and is now naturalized in wetlands and lakeshores in parts of the northwest, midwest and eastern United States and Canada. A number of herbicides are effective to varying degrees on garden loosestrife. First recorded in Washington in 1978 (on King County’s Lake Washington), garden loosestrife also occurs throughout the Northeast and in the western states of Colorado, Montana, and Oregon. The key is to be vigilant and patient. The invasions are especially worrisome because the plants can clog shallow waterways and displace native vegetation, reducing habitat for waterfowl and fish—including several important salmon species. The Eurasian yellow loosestrife (Lysimachia vulgaris), is an erect plant about 2 to 4 feet high. Purple loosestrife’s magenta flowers clustered in tall, dense spikes. 2) Loosestrife weevils and beetles feed on weed leaves. As always, if you have any questions about garden loosestrife identification or control, feel free to call us at 206-477-WEED (206-477-9333) or email us at noxious.weeds@kingcounty.gov. “It’s popping,” says Weed Specialist Sawyard Glise, who joined Ben Peterson for a survey of the slough earlier this month. We first controlled the site in 2002, when garden loosestrife formed an 11 acre monoculture in the slough. Plants should be divided every 2 or 3 years, in the spring or fall, to control their growth.

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