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. Clarifying its influence would provide insight into appropriate management actions following invasion. While seeds can germinate in water, establishment is much more successful in moist substrate that’s not flooded. The exotic invasive wetland plant purple loosestrife (Lythrum salicaria) is often considered to have negative impacts on native plant and animal species, but this is debated. Habitat: Purple loosestrife thrives along roadsides and in wetlands. 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.Leaves are arranged in pairs or whorls.Distribution Found throughout the UK, but less common in Scotland. Purple loosestrife aggressively invades wetland areas, displaces native plants, and disrupts habitat for native animals. Purple-loosestrife is a tall plant, with large, pink flower spikes and long green leaves in opposite pairs up the stem. It has a branched stem bearing whorls of narrow, pointed, stalkless leaves and ending in tall, tapering spikes of red-purple flowers. It contains a flower spike of pink-purple flowers that bloom in late June to August. 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. The plant blossoms every July through September. Purple loosestrife is a perennial wetland plant that is non-native to Minnesota and is classified as a Prohibited Invasive Species. It is best planted in the spring and fall months, although its hardiness means it can survive being planted in mild periods in winter. Zell, CC BY-SA 3.0, via Wikimedia Commons.
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