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You are here: Home / Aquatic Species / Species Profiles / Giant Salvinia
Aquatic Species
Species Profiles

Giant Salvinia

Giant SalviniaScientific name: Salvinia molesta D. S. Mitch. (ITIS)

Common names: Giant salvinia, kariba-weed

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Selected Resources

Native To: Brazil (McFarland et al. 2004)

Date of U.S. Introduction: 1990s (McFarland et al. 2004)

Means of Introduction: Horticultural trade (McFarland et al. 2004)

Impact: Forms dense mats that block sunlight and reduce oxygen levels (McFarland et al. 2004)

Current U.S. Distribution:

Federally Regulated:

  • Noxious Weeds Program
    USDA. APHIS. Plant Protection and Quarantine.
    Includes species listed as a Federal Noxious Weed under the Plant Protection Act, which makes it illegal in the U.S. to import or transport between States without a permit.



Selected Resources:

Council or Task Force

Species of Concern Fact Sheet: Giant Salvinia
Aquatic Nuisance Species Task Force.


Federal Noxious Weed Disseminules of the U.S. - Fact Sheet: Salvinia auriculata complex
USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.

Pacific Island Ecosystems at Risk (PIER) - Salvinia molesta
USDA. FS. Institute of Pacific Islands Forestry.

Invasive Plant Atlas of New England (IPANE) - Giant Salvinia, Water Fern
University of Georgia. Center for Invasive Species and Ecosystem Health.

Invasive Plant Atlas of the MidSouth - Giant Salvinia
Mississippi State University. Geosystems Research Institute.

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

Texas Invasives Database - Salvinia molesta

The Quiet Invasion: A Guide to Invasive Species of the Galveston Bay Area - Giant Salvinia, Kariba Weed; Common Salvinia, Water Spangles
Texas Commission on Environmental Quality, Galveston Bay Estuary Program; Houston Advanced Research Center (HARC).

Invasive Species Compendium - Salvinia molesta
CAB International.

Plantwise Technical Factsheet - Kariba weed (Salvinia molesta)
CABI. Plantwise Knowledge Bank.

EPPO Global Database - Salvinia molesta
European and Mediterranean Plant Protection Organization.

Global Invasive Species Database - Salvinia molesta (aquatic plant)
IUCN. Species Survival Commission. Invasive Species Specialist Group.

Keys and Fact Sheets: Salvinia molesta (Kariba Weed)
East African Network for Taxonomy.

Federal Government

Nonindigenous Aquatic Species Database: Fact Sheet - Giant Salvinia
DOI. USGS. Wetland and Aquatic Research Center.
Provides distribution maps and collection information (State and County).

U.S. National Plant Germplasm System - Salvinia molesta
USDA. ARS. National Genetic Resources Program. GRIN-Global.

PLANTS Database - Kariba-weed
USDA. NRCS. National Plant Data Center.

International Government

Weeds in Australia - Salvinia (Salvinia molesta)
Australian Government. Department of the Environment and Energy.

Designated Weed of National Significance

Weeds of National Significance: Weed Management Guide - Salvina (2003)
Cooperative Research Centre for Australian Weed Management.

Invasive Plants: Restricted Invasive Plants - Salvinia
Queensland Business and Industry Portal (Australia).

NSW WeedWise: Salvinia
New South Wales Department of Primary Industries (Australia).

State Government

Aquatic Invasive Species: Giant Salvinia Risk Assessment for Arizona (Jul 2010; PDF | 380 KB)
Arizona Game and Fish Department.
See also: Aquatic Invasive Species for additional risk analyses and related species information

Encycloweedia: Data Sheet - Salvinia
California Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources

Noxious Weed Species - Giant Salvinia
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.

Weed Alerts: Giant Salvinia
Florida Fish and Wildlife Conservation Commission.

Illegal Aquatic Plants - Giant Salvinia
South Carolina Department of Natural Resources. Aquatic Nuisance Species Program.


Weed Control in Natural Areas in the Western United States: Giant Salvinia (2013; PDF | 194 KB)
University of California. Weed Research and Information Center.
See also: Weeds in Natural Areas for more information sheets

Plant Profile: Salvinia molesta
University of Florida. IFAS. Center for Aquatic and Invasive Plants.

AQUAPLANT - Giant Salvinia
Texas A&M University. AgriLife Extension Service. Department of Wildlife and Fisheries Sciences.


Noxious Weed Information - Giant Salvinia
Colorado Weed Management Association.


Integrated Taxonomic Information System. Salvinia molesta. [Accessed Sep 10, 2014].

McFarland, D.G., L.S. Nelson, M.J. Grodowitz, R.M. Smart, and C.S. Owens. 2004. Salvinia molesta D. S. Mitchell (Giant Salvinia) in the United States: A review of species ecology and approaches to management (PDF | 3.37 MB) (ERDC/EL SR-04-2) Jacksonville, Fla.: U.S. Army Corps of Engineers Aquatic Plant Control Research Program.

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Last Modified: Sep 15, 2018
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