As of this writing (2002), purple loosestrife is listed as a noxious weed in 29 states in the U.S. and 2 Canadian provinces. See the Invaders or Plants databases for current information. The state of Minnesota has prohibited the sale of European wand loosestrife and any cultivars from crosses between purple and European wand loosestrife .
- 139. Welling, Charles H.; Becker, Roger L. 1992. Life history and taxonomic status of purple loosestrife in Minnesota: implications for management and regulation of this exotic plant. Special Publication 146. St. Paul, MN: Department of Natural Resources, Division of Fish and Wildlife. 15 p. 
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