An emergent, herbaceous aquatic plant, Eurasian watermilfoil, usually extends 3 to 10 feet, but can reach as much as 33 feet in length. The stems are reddish-brown to whitish-pink. It forms dense mats on the surface of water bodies, and new plants that may emerge from each node on a stem root on contact with mud. Regenerates mostly from rhizomes, fragmented stems, and axillary buds that develop throughout the year. Eurasian watermilfoil can be found in nearly 400 WI lakes.
- Invades lakes, rivers, and other water bodies ranging from fresh to brackish; thrives in areas that have been subjected to various kinds of natural and manmade disturbance.
- Can form large, floating mats of vegetation on the surface of water bodies, preventing light penetration for native aquatic plants and impeding water traffic.
- Winter-hardy, able to overwinter in frozen lakes and ponds in northern states and Canada; also able to grow in shallow, over-heated bays such as Chassahowitzka Bay in FL.
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