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Widgeonweed

Ruppia

Also called Tasselweed, Seagrass, Wigeon Grass, Ditchgrass, Tasselweeds, Widgeongrass, Horse's Mane Weed

Widgeonweed
Photo: Carl Axel Magnus Lindman, Public domain

Ruppia is a genus of small aquatic plants, mostly annual, that grow submerged in brackish estuaries and coastal waters. Members are grown mainly in aquariums and ponds with brackish or salty water, and the key is keeping them submerged in clear, slightly saline water with good light.

Family
Ruppiaceae (Ruppi family)
Grows as
Grass, Aquatic
Light
Full sun, Bright indirect
Water
Keep fully submerged in brackish or slightly saline water; they do not grow on land.
Soil
Sandy or muddy substrate, or a shallow sand layer in an aquarium.
Temperature
10–25 °C; they tolerate cool water but may die back in heat.
How easy
Moderate
Safety
Toxic

About

Ruppia, also known as the widgeonweeds, ditch grasses or widgeon grass, is the only extant genus in the family Ruppiaceae, with 11 known species. These are aquatic plants widespread over much of the world. The genus name honours Heinrich Bernhard Rupp, a German botanist (1688–1719). They are widespread outside of frigid zones and the tropics.

Safety

These plants present an anatomy non-C4 type. Seven labdanes have been identified from this genus:

ent-14,15-Dinor-8(17)-labden-13-one

Other Ruppia plants

Ruppia bicarpa · Widgeongrass · Large-fruit seatassel · Species code: Rp

Text excerpted from the Wikipedia article Ruppia 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.

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