"Sometimes what appear to be islands rising out of the water are actually drifting masses of peat, mud, and plants. ... Though this page pertains to ... Florida, these phenomena are in fact world-wide, witnessed in such places as Argentina, Australia, Finland, India, Japan, Kenya and Papua New Guinea." Includes images and information about the control of tussocks ("rafts of herbaceous plants") and floating islands. Part of "Plant Management in Florida Waters."