Water Chestnut 101 What is water chestnut? Dense growth of water chestnut may harm native species and ecosystems, and limit boating, fishing, swimming, and other recreational activities. The plant also has submerged leaves which are deep under the surface of the water. Water Chestnut Discovered in New Hampshire Waters [exit DNR] Global Invasive Species Database: Trapa natans [exit DNR]. Water chestnut is an invasive floating-leaved plant that can form dense mats at the water’s surface, crowding out native aquatic species. Once water chestnut takes over a creek or pond, it can cut off important nutrients for our native wildlife as well as impede recreational activities such … European Water Chestnut is an aquatic, invasive plant species consisting of floating leaves that form a rosette on a water bodies surface. 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 is hardy and can survive across a range of climates. Specimens are needed to confirm sightings, but some jurisdictions prohibit possession and transport of invasive aquatic plants and animals. Water chestnut is an aquatic, floating plant, which grows in floating mats and has white or light purple flowers. 2). It grows in lakes, ponds, canals, and other slow-moving water bodies. Each plant can have multiple rosettes which create a sheet over the surface of the water. Water chestnut (Trapa natans L.) (Fig. European water chestnut is a non-native aquatic plant that is highly invasive and, if left untreated, can quickly take over a waterway. Water chestnut is an aquatic invasive plant that is native to Eurasia and Africa. 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. 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. 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 (Trapa natans) is a rooted submerged aquatic plant that quickly forms dense floating mats and outcompetes native plant communities. 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. Keep reading for more information on these water chestnut plants. Appearance Trapa natans is a rooted, floating plant that invades shallow to deep, fresh water habitats in the northeastern United States. 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. There are two plants referred to as water chestnut plants: Eleocharis dulcis and Trapa natans. Water chestnut colonizes areas of freshwater lakes, ponds and slow- 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 … 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. One is commonly thought to be invasive while the other may be grown and eaten in a number of Asian dishes and stir-fries. • The green triangular 2-4 cm wide floating leaves form rosettes, which are attached to … It prefers slow-moving, nutrient-filled waters, such as ponds, lakes, and shallow streams. Last updated Sept. 28, 2005. 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