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Tidalmarsh Amaranth (Amaranthus cannabinus (L.) Sauer)

Also known as salt marsh water hemp, salt marsh pigweed.

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An annual aquatic plant of brackish areas of the east coast of North America.

Range - Expand

Not Present
Native or Not Present

This map is based on our research. We have checked its accuracy to Level 3 ecoregions. Although this plant occurs somewhere in each of these regions, it may only occur in a small part of some or all of them.

BONAP shows this species as 'adventive' in Louisiana; we defer to FSUS which marks these reports as rejected.


An aquatic plant, preferring brackish water but able to grow in fresh water as well. Mostly limited to salt marshes and brackish marshes, and brackish coastal areas, shores of tidal rivers, and wetland edges. Rare in freshwater wetlands slightly inland.

May hybridize and form an integrade with A. australis (mostly found from Florida west along the gulf coast) towards the southern end of its range.

Numerous other Amaranthus species also occur in this species range, but not usually in the same habitat.

Amaranthus cannabinus (Tidalmarsh Amaranth) | USDA PLANTS Database (About This Site)

Amaranthus cannabinus | Go Botany (About This Site)

Amaranthus cannabinus | Biota of North America Project (BONAP) (About This Site)

Amaranthus cannabinus | NatureServe Explorer (About This Site)

Amaranthus cannabinus | Flora of North America (About This Site)

Tidal Marsh Amaranth | Maryland Biodiversity Project (About This Site)

Amaranthus cannabinus (L.) J.D.Sauer | Plants of the World Online (POWO) (About This Site)