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Purple loosestrife can range from 1 to 2 meters tall. Purple flowers are arrange in a spike at the top of the plant. Many stems often grow from a single root ball in the ground.
This plant grows in thick stands that can impede shoreline access and out compete native plants.
Purple loosestrife is easily misidentified and has been known to be inadvertently sold, purchased and transported by gardeners. Anglers and hunters can spread seeds after coming into contact with the plant and its flowers.