Help Stop Invasive Species With your help we can stop the spread of invasive species around the world. Threats in Your Backyard Threats to biodiversity may be lurking right in your backyard. Purple loosestrife — also known as the "purple plague" — was once limited to gardens in the Northeast. It now chokes wetlands across the country.

Stopping the spread of invasive species requires everyone’s involvement. Here are some easy ways in which you can make a difference.

• Watch out for bad plants in your backyard.
• Follow our six easy tips to stop invasives.
• Carry our wallet card to identify invasive plants in your region.
• Take our quiz and test your knowledge!
• Donate now to support The Nature Conservancy’s work to combat the spread of invasive species.
• Sign up for the Conservancy’s Great Places Network: a free online membership program, to learn more about what the Conservancy is doing in your state and around the world. 

Learn more about what the Conservancy is doing to prevent and control invasive species.

Nature picture credits (top to bottom, left to right): Photo © Bill Keogh/TNC (boy scouts removing invasive trees in Florida); Photo © Mark Godfrey/TNC (invasive crayfish species): Photo © Barry Rice (purple loosestrife).