Water chestnut is an invasive floating-leaved plant that can form dense mats at the water’s surface, crowding out native aquatic species. Water chestnut is hardy and can survive across a range of climates. It grows in lakes, ponds, canals, and other slow-moving water bodies. It prefers slow-moving, nutrient-filled waters, such as ponds, lakes, and shallow streams. Dense growth of water chestnut may harm native species and ecosystems, and limit boating, fishing, swimming, and other recreational activities. One is commonly thought to be invasive while the other may be grown and eaten in a number of Asian dishes and stir-fries. European water chestnut (or water chestnut) is an invasive aquatic plant that has been introduced to the Ottawa River in eastern Ontario within Voyageur Provincial Park. Water Chestnut Discovered in New Hampshire Waters [exit DNR] Global Invasive Species Database: Trapa natans [exit DNR]. • The green triangular 2-4 cm wide floating leaves form rosettes, which are attached to … Water chestnut is an aquatic invasive plant that is native to Eurasia and Africa. 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. Introduced in the United States in the mid-1800s as an ornamental plant, water chestnut was soon found growing in Collins Lake near Scotia, NY. Water Chestnut 101 What is water chestnut? Last updated Sept. 28, 2005. 2). The plant also has submerged leaves which are deep under the surface of the water. It can grow in 12-15 ft. (3.6-4.6 m) of water and forms dense, floating mats, often three layers deep. Water Chestnut: An Exotic Invasive Aquatic Plant Trapa natans Description • Water Chestnut is an annual, rooted floating leaved non-native plant that can form dense impenetrable mats at the water’s surface. Water chestnut is an aquatic, floating plant, which grows in floating mats and has white or light purple flowers. There are two plants referred to as water chestnut plants: Eleocharis dulcis and Trapa natans. Water chestnut (Trapa natans L.) (Fig. Each plant can have multiple rosettes which create a sheet over the surface of the water. Abstract: With a floating-leaf growth form and an explosive growth rate, water chestnut (Trapa natans) can grow to completely dominate water surfaces, prompting large changes in ecosystem functionality.The lack of success controlling water chestnut with chemical and physical methods prompted renewed research in biological control, and we are evaluating the potential of Galerucella … Water chestnut colonizes areas of freshwater lakes, ponds and slow- Specimens are needed to confirm sightings, but some jurisdictions prohibit possession and transport of invasive aquatic plants and animals. European Water Chestnut is an aquatic, invasive plant species consisting of floating leaves that form a rosette on a water bodies surface. Water Chestnut … 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. Keep reading for more information on these water chestnut plants. 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