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Eurasian Watermilfoil

Myriophyllum spicatum Linnaeus
Eurasian Watermilfoil
Alison Fox, University of Florida


Commodities Affected:



Eurasian watermilfoil is an extremely well adapted plant, able to thrive in a wide variety of environmental conditions. It grows well in still and flowing waters, tolerates mild salinities, and can even survive under ice. Eurasian watermilfoil grows rooted in water depths from 1 to 10 meters, generally reaching the surface in depths of 3 to 5 meters. Adaptable to a wide variety of substrate types, this species seems to favor fine textured, inorganic sediments. The plants grow rapidly, branching profusely at the surface where they form dense floating mats, choking and shading out all other plants in the area. Infestations render waters unsuitable for boating, swimming, fishing, and other recreational uses.  <>


Eurasian watermilfoil is known to occur in the following 25 counties in Indiana: Allen, Brown, Cass, Clay, Daviess, Dekalb, Elkhart, Fulton, Henry, Kosciusko, LaGrange, Lake, La Porte, Madison, Marshall, Martin, Monroe, Noble, Porter, St. Joseph, Steuben, Sullivan, Wabash, Wayne, and Whitley. (Indiana Department of Natural Resources - Exotic Plant Species in Indiana Lakes (01/12/1998)