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American water plantain

Alisma subcordatum

Also called Southern water-plantain, Small Water Plantain, Waterplaintain, Broad Leaved Water Plantain

American water plantain
Photo: Robert H. Mohlenbrock. USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National, Public domain

Alisma subcordatum is a perennial aquatic or semi-aquatic plant from eastern and central North America that grows from bulb-like corms in mud at the edges of shallow water. Keep its roots wet and give it full sun, and it grows readily.

Family
Alismataceae (Alismat family)
Grows as
Aquatic, Bulb, Perennial
Light
Full sun, Part shade
Water
Keep the roots constantly wet or submerged in shallow water or saturated mud.
Soil
Heavy, fertile mud or loam kept saturated; a pond-margin or bog mix works well.
Temperature
Hardy in cool to warm temperate zones; tolerates winter freezing when the corms stay below ice; protect from prolonged heat above 35 °C without water.
How easy
Easy
Native range
SE. Canada to C. & E. U.S.A.
Climate
temperate

About

Alisma subcordatum, the American water plantain, is a perennial aquatic plant in the water-plantain family (Alismataceae). This plant grows to about 3 feet (0.91 meters) in height with lance to oval shaped leaves rising from bulbous corms with fibrous roots. Any leaves that form underwater are weak and quick to rot; they rarely remain on adult plants. A branched inflorescence with white to pink 3-petaled flowers blooms from June to September. The seeds are eaten by waterfowl and upland birds. Native Americans dried and ate the submerged rootlike structures. The species name subcordatum means "almost heart-shaped".

Where it grows

American water plantain is native to most of eastern and central United States and Canada from Texas to Georgia, north to Manitoba and New Brunswick, though it has not been reported from Florida. It grows in the mud of still to slow moving water, seeps, and wetlands.

Other Alisma plants

Channelled Water Plantain · Narrowleaf water plantain · Lanceleaf water plantain · Alisma nanum · Asian Water Plantain · European water plantain · Northern water plantain · Baltic Water Plantain · Water plantain

Text excerpted from the Wikipedia article Alisma subcordatum by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.

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