Copyright 2019 - Rock Haven Lake Association (ein: 45-3609719) is a registered 501c3 nonprofit with 100% of proceeds benefitting the charity 

Eurasian  watermilfoil is a native plant to Europe, Asia and northern Africa. It  is, however, non-native to North America. It is not exactly known when  Eurasian watermilfoil came in contact with North American waters. There  are various assumptions of how it got here, one of which is that someone  brought it over from Europe as an aquarium plant. After it over took  their aquarium, it was disposed in the yard and made its way into a  watershed, spreading from there. Another theory is that it was brought  over in the ballast water of ships, on their way to the great lakes.
Eurasian  watermilfoil is an extremely rapid growing plant. It can grow up to 10  inches in a weeks time. The roots of the plant are a distinct silver  color that can root in an array of bottom types. It can and will grow in  sandy, rocky bottoms but thrives in the more silty bottoms that are  nutrient rich. The weed has numerous stocks that grow from its fibrous  root system. 

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 The stocks will grow up to the surface, sometimes in 20 plus feet of  water area, and are capable of supporting Eurasian watermilfoil growth.

 The plant has 4 whorls of 4 feathery leaves around the stem. Each leaf  is divided into paired leaflets, primarily 12-21 pairs per leaflet. The  top of the plant is topped with a bright red crown. Individual stems  branch out at the top of the plant when the plant nears the surface. 

 The plant spreads so easily and rapidly  because it starts spring growth sooner than other aquatic plants, can  live in both nutrient rich and nutrient poor waters, and reproduces  through fragmentation. This means that any part of a stem that breaks  off from a plant will float to other areas, eventually sink to the  bottom, and start a new plant. Anything that disrupts the water, like  outboard motors, can cause fragmentation and new growth. In late summer  and fall, a period that coincides with greatest use, the  plants become brittle and even more prone to fragmentation. 

 Infestations rapidly expand and can take  over an entire lake within two years of its introduction. Unchecked, it  quickly forms a thick canopy that chokes out other plant-life and  adversely affects lower food-chain aquatic life and eventually fish,  reptile and amphibian predators. In addition to its effects on aquatic  life and fishing, Eurasian Milfoil can damage outboard motors and  hinders recreational boating and swimming. 

 Maine law makes it illegal to transport Eurasian watermilfoil, along  with  zebra mussels and water chestnuts, on boats and boating equipment.  Any person found transporting any of these species to or from a Maine lake or pond will be in violation of this law. Penalties for violations  could include fines, imprisonment, or both.