1), also known as horned water chestnut or water caltrop, is an aquatic weed of the northeastern United States that can dominate ponds, shallow lakes, and river margins (Fig. The plant is native to Europe, Asia and Africa, and is used in North America as an ornamental water garden plant. Aquatic Invasive Species; Water Chestnut; Water Chestnut. … Water chestnut chokes an inlet in the South Lake. Although it’s not certain how the plants arrived in the Ottawa River, it could possibly be the result of a water garden plant(s) … It was first observed in North America near Concord, … Expand Interactive Map. Invasive Species - (Trapa natans) Watch List - Prohibited in Michigan Water Chestnut has green floating leaves with sharply serrated edges that form a densely crowded rosette. Dense growths can interfere with swimming and entangle propellers, which hinders boating, fishing, and waterfowl hunting. Lists general information and resources for Water Chestnut. Dense growth of water chestnut may harm native species and ecosystems, and limit boating, fishing, swimming, and other recreational activities. This page was last edited on 21 October 2020, at 14:38 (UTC). 2).It displaces native … Water chestnut (Trapa natans) is a rooted submerged aquatic plant that quickly forms dense floating mats and outcompetes native plant communities. In: Van Driesche, R., et al., 2002, Biological Control of Invasive Plants in the Eastern United States, USDA Forest Service Publication FHTET-2002-04, 413 p. Pest Status of Weed. In mid-July, small white flowers appear on rosettes at the … Summer is the season for pulling out water chestnuts along the Connecticut River, and groups concerned with the prolific invasive plant are getting ready and organizing volunteers. First introduced to the Lake in the 1940s, water chestnut (Trapa natans L.), is a nonnative plant that forms dense surface mats, crowding out other plant species, disrupting habitat, and severely limiting recreational enjoyment and commercial use of the Lake in some areas. It has also been found at Wolfe Island in Lake Ontario, in the Rideau River in Ottawa, and in the St. Lawrence River in Kingston. … The … Species Profile - Water Chestnut (Trapa natans), National Invasive Species Information Center, United States National Agricultural Library. Its decay can deplete oxygen levels, leading to fish kills. European water chestnut (Trapa natans), an invasive aquatic plant inadvertently released into waters of the Northeast that is spreading throughout New England and the Mid-Atlantic States, including Pennsylvania, clogging waterways and ponds and altering aquatic habitats.The water chestnut's native range includes Europe, Asia, and Africa. 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