Governmental Agencies/Nationwide

• IPM Techniques for Control of Purple Loosestrife - U.S. Fish and Wildlife Service Invasive Species Program
• Purple Loosestrife - The Nature Conservancy (America's Least Wanted)
• Purple Loosestrife Info Centre - Manitoba Purple Loosestrife Project
• Classical Biological Control of Weeds - Canada Lethbridge Research Centre
• Invasivespecies.gov - U.S. federal and state information
• Lythrum (Purple Loosestrife) - Pest Tracker by NAPIS (National Agricultural Pest Information System) (CONTROL NEWS, FACTS, MAPS, SITES)
• Lythrum salicaria: Purple Loosestrife - The Invasive Species Initiative (MAPS, CONTROL METHODS)
• Purple Loosestrife - National Park Service/Plant Conservation Alliance, Alien Plant Working Group (FACTSHEET)