“The floating water-hyacinth was introduced into Florida in the 1880s and covered more than 120,000 acres of public lakes and navigable rivers by the early 1960s. Since then, intensive management efforts coordinated by the Florida Department of Environmental Protection and the U.S. Army Corps of Engineers have reduced water hyacinth to approximately 2,000 acres statewide.
Because of its aggressive growth rate, water-hyacinth is illegal to possess in Florida without a special permit.
The growth rate of water-hyacinth is among the highest of any known plant. In Florida, water-hyacinth populations can double their size in as little as 2 weeks by sending off short runner stems that develop new plants (daughter plants). Water-hyacinth also has the ability to reproduce by seeds.”