Also called spiked loosestrife and ◼︎ purple lythrum.  Part of loosestrife  genus Lythrum in family Lythraceae.

Native to Eurasia and northwest Africa.  Invasive > learn+quiz Invasive > Global Invasive > in USA+Canada Invasive > report it! Invasive > in USA Invasive > in Michigan restricted in Michigan, incl. seeds, fragments and derivatives (.pdf) Biology and Biological Control of Purple Loosestrife (.pdf)

Uses by native peoples
(Ethnobotany database)

In the 🇺🇸 USA, the USDA suggests those seeking a wet-tolerant plant with a long bloom season replace this plant with native alternatives ♒︎ swamp milkweed  Asclepias incarnata, sweet pepperbush  Clethra alnifolia, ◼︎ eastern purple coneflower  Echinacea purpurea, grass-leaved blazing star  Liatris pilosa, gayfeather  Liatris spicata, ◼︎ green-headed coneflower  Rudbeckia laciniata or New York ironweed  Vernonia novaboracensis. [1]   And the Lehigh Gap Nature Center suggests those seeking purple flower spikes that attract pollinators in summer replace this plant with native alternatives blazing-star  genus Liatris or Joe-pye weed  genus Eutrochium. [2]

🚼︎ For kids!  This plant described in a USDA Forest Service coloring noxious weeds page.

Learn more about ◼︎ purple loosestrife Lythrum salicaria

Best Control Practices BCP (Ontario) (.pdf) and its Technical Bulletin (.pdf) treatment details (Michigan) (.pdf pages 35, 36, 79, 134, 203, 204 and 246) Biology and Biological Control (.pdf) Biological Control in Eastern USA (.pdf page 157)

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