![]() Genus name presumably comes from the Greek word lythron meaning blood with reference to the color of the flowers. A number of cultivars, such as the popular ‘Morden Pink’ have been marketed over the years as sterile plants, but there is evidence that some of these cultivars may interbreed. Magenta flowers appear in dense terminal spikes (to 18” long) over a long summer to early fall bloom period. Downy, stemless, lance-shaped leaves (to 4” long) are opposite or sometimes in whorls of three. It typically grows 2-4’ tall on stiff upright stems. Stems are erect and quadrangular in section with evenly spaced nodes in opposite pairs or in whorls of three. In North America and exceptionally in the southern limits of its native range, taller plants (up to 350 cm) can be found. The problem is that it is so invasive that it can rapidly colonize wet areas and both choke out native vegetation and destroy wildlife habitat. salicaria is a perennial herb 30-200 cm tall with a persistent woody rootstock. ![]() Leaves are lance-shaped, stalkless, and heart-shaped or rounded at the base. Invasive Information This plant can be weedy or invasive according to the authoritative sources noted below. In full flower, a colony of purple loosestrife produces spectacular bloom. Purple loosestrife is an erect perennial herb in the loosestrife family, with a square, woody stem and opposite or whorled leaves. It has gradually spread throughout much of the United States, particularly in marshes, swamps, pond peripheries, ditches and wet meadows. Although many alien invasive plants have naturalized by escaping gardens, purple loosestrife basically began naturalizing on its own in rural areas. from seed contained in ships’ ballast, and it became established in certain estuaries in the northeastern states by the early 1800s. In July-September, tall spikes of tiny, 5-7-petaled, magenta flowers appear at stem ends, eventually. Simple, smooth-edged leaves grow opposite or whorled on stiff, 4-6-sided stems. It is believed to have been first introduced into the U.S. Purple loosestrife, a regulated Class B noxious weed, is a 6-10-foot-tall perennial that grows on lakes and waterways throughout King County. Lythrum salicaria, commonly called purple loosestrife, is a clump-forming wetland perennial that is native to Europe and Asia. A very aggressive invader of sunny wetlands, purple loosestrife displaces native species and reduces plant and animal diversity.
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