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In the U.S.---Purple loosestrife (Lythrum salicaria) is listed as an exotic invasive species to Missouri and the Midwest by the Midwest Invasive Plant Network. It is one of the top twenty plants known to be spreading into native plant areas and crowding out native species. It spreads primarily by self-seeding, but will also spread by rhizomes. It is particularly invasive in wetland areas and is on the World Conservation Union’s list of 100 Worst Invasive Species. It is now listed as a noxious weed in Missouri making it illegal to grow, propagate or sell the plant (or which means it may not be sold and must be controlled on all properties).