Also known as gill-over-the-ground and creeping Charlie, it was introduced into North America as an ornamental or medicinal plant, as early as the 1800s.
Swearingen, J., B. Slattery, K. Reshetiloff, and S. Zwicker. 2010. Plant Invaders of Mid-Atlantic Natural Areas, 4th ed. National Park Service and U.S. Fish and Wildlife Service. Washington, DC. 168pp.