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You are here: Home / Aquatic Species / Species Profiles / Water Chestnut
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Water Chestnut

Water ChestnutScientific name: Trapa natans L. (ITIS)

Common names: Water chestnut, water nut, water caltrop

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Selected Resources

Native To: Eurasia (Fofonoff et al. 2003)

Date of U.S. Introduction: 1800s (Fofonoff et al. 2003)

Means of Introduction: Ornamental (Fofonoff et al. 2003)

Impact: Crowds out native species (Fofonoff et al. 2003)

Current U.S. Distribution:



Selected Resources:


Invasive Plant Atlas of New England (IPANE) - Water chestnut, European water chestnut
University of Georgia. Center for Invasive Species and Ecosystem Health.

Invasive Plant Atlas of the United States - Water Chestnut
University of Georgia. Center for Invasive Species and Ecosystem Health.

New York Invasive Species Information - Water Chestnut
New York Invasive Species Clearinghouse.

Water Chestnut
Northeast Aquatic Nuisance Species Panel

Invasive Species Compendium - Trapa natans
CAB International.

Global Invasive Species Database - Trapa natans (aquatic plant)
World Conservation Union. Invasive Species Specialist Group.


Trapa natans L. (Water Chestnut) - Aquatic Plant Information System (APIS)
DOD. USACE. Engineer Research and Development Center. Environmental Laboratory.

Germplasm Resources Information Network (GRIN) - Trapa natans
USDA. ARS. National Genetic Resources Program.

Water Chestnut - Biological Control of Invasive Plants in the Eastern United States (Aug 2002)
Published by: USDA. Forest Service. Publication FHTET-2002-04.

PLANTS Database - Water Chestnut
USDA. NRCS. National Plant Data Center.

Water Chestnut
DOI. FWS. Connecticut River Coordinator's Office.

National Exotic Marine and Estuarine Species Information System (NEMESIS): Chesapeake Bay Introduced Species Database - Trapa natans
Smithsonian Institution. Smithsonian Environmental Research Center. Marine Invasions Research Lab.

Weed Alert: Water caltrop
New South Wales Department of Primary Industries (Australia). Agriculture.

Fact Sheet: European Water Chestnut (PDF | 410 KB)
Ontario Ministry of Natural Resources (Canada).


Aquatic Invasive Species: Water Chestnut (May 2005; PDF | 96 KB)
Indiana Department of Natural Resources.

Water Chestnut
Maryland Department of Natural Resources.

Water Chestnut: An Exotic Invasive Aquatic Plant (PDF | 1.69 MB)
Massachusetts Department of Conservation and Recreation.

Water Chestnut Discovered in New Hampshire Waters - Environmental Fact Sheet (2010; PDF | 746 KB)
New Hampshire Department of Environmental Services.

AIS Action Plan: Water Chestnut (Jun 2011; PDF | 130 KB)
Pennsylvania Fish and Boat Commission.

Aquatic Invasive Species in Rhode Island: Water Chestnut (Jun 2009; PDF | 789 KB)
Rhode Island Department of Environmental Management. Office of Water Resources.

Water Chestnut and Water Chestnut Fast Sheet (PDF | 106 KB)
Vermont Agency of Natural Resources. Environmental Conservation.

Water Chestnut
Wisconsin Department of Natural Resources.


Weed Control in Natural Areas in the Western United States: Water Chestnut (2013; PDF | 279 KB)
University of California. Weed Research and Information Center.

Water Chestnut - Maine Invasive Plants Bulletin no. 2535
University of Maine. Cooperative Extension.

Water Chestnut - Aquatic Invasive Species in the Chesapeake Bay (PDF | 101 KB)
Maryland Sea Grant.

Introduced Species Summary Project - Water Chestnut
Columbia University. Center for Environmental Research and Conservation.

Water Chestnut (Trapa natans) in the Northeast (Feb 2006; PDF | 350 KB)
New York Sea Grant.

European Water-chestnut (PDF | 271 KB)
University of Pennsylvania. Morris Arboretum.


Water Chestnut - Maine's Interactive Field Guide to Aquatic Invaders and Their Native Look Alikes
Maine Volunteer Lake Monitoring Program. Maine Center for Invasive Aquatic Plants.


Fofonoff, P.W., G.M. Ruiz, B. Steves, A.H. Hines, and J.T. Carlton. 2003. Trapa natans. In: National Exotic Marine and Estuarine Species Information System: Chesapeake Bay Introduced Species Database. [Accessed Sep 16, 2014].

Integrated Taxonomic Information System. Trapa natans. [Accessed Sep 10, 2014].

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Last Modified: Mar 20, 2015
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