MDARD Weed Risk Assessment for Purple Loosestrife (Lythrum salicaria) - This document evaluates the invasive potential of the plant species using information based on establishment, spread and potential to cause harm. Purple Loosestrife Invasive Species Alert - Printable PDF Other Common Names: Purple lythrum, rainbow weed, salicaria, spiked loosestrife. This can lead to a reduction in plant diversity, which reduces habitat value to wildlife. Local Concern: Given the right conditions, purple loosestrife can rapidly establish and replace native vegetation. Distribution: Purple loosestrife has been introduced to every state except Florida. It prefers full sun, but can tolerate shade. The Eurasian forb purple loosestrife, Lythrum salicaria, is an erect, branching, perennial that has invaded temperate wetlands throughout North America. Its flowers look very similar to those of common loosestrife. Another species known to us for the garden is the rod loosestrife ( Lythrum virgatum ). The flowers sit in racemose or spike-like flowerheads on the shoots. While seeds can germinate in water, establishment is much more successful in moist substrate that’s not flooded. From June to September, the purple loosestrife shows its purple colourfulness in the flowering season. Habitat: Purple loosestrife thrives along roadsides and in wetlands. Purple loosestrife, Lythrum salicaria, is a tall-growing wildflower that grows naturally on banks of streams and around ponds. Photo courtesy of Steve Dewey, Utah State University,. Photo courtesy of Linda Wilson, University of Idaho,. Magenta flower spikes with 5-7 petals per flower are present for most of the summer. characteristics In loosestrife Purple loosestrife ( Lythrum salicaria ), native to Eurasia and now common in eastern North America, grows 0.6 to 1.8 metres (2 to 6 feet) high on riverbanks and in ditches.Leaves are arranged in pairs or whorls.long (45 cm) held atop lance-shaped leaves. It features pink, purple, or magenta flowers in dense spikes, up to 18 in. Other names include spiked loosestrife and purple Lythrum. It should not be confused with other plants sharing the name loosestrife that are members of the family Primulaceae. Perennial herb with a woody, square stem covered in downy hair. Spectacular when in full bloom, Purple Loosestrife (Lythrum salicaria) is a vigorous, upright perennial enjoying an extremely long bloom season from early to late summer. Lythrum salicaria or purple loosestrife is a flowering plant belonging to the family Lythraceae.It has opposite leaves that are long and narrow with pointed tips, smooth edges, and heart-shaped bases that connect directly to the plant stem with no leaf stalks. It can grow anywhere from 4 to 8 feet tall. Or - download the MISIN smartphone app and report from your phone - /tools/apps/#home Purple loosestrife is an erect, perennial herb, with a candelabrum of flowering branches at the top of the plant. Use the Midwest Invasive Species Information Network (MISIN) online reporting tool
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