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Spiny rush

Juncus acutus

Also called Sharp Rush, Large Marsh Rush

Spiny rush
Photo: Calistemon, CC BY-SA 4.0

Spiny rush (Juncus acutus) is a tussock-forming perennial rush that grows to about 1 to 1.5 metres and is found in wet habitats such as marshes, fens, salt marshes and pond edges. It thrives in consistently moist or wet, often saline, soil and is best suited to wetland or pond-margin plantings.

Family
Juncaceae (Junc family)
Grows as
Perennial
Light
Full sun, Part shade
Water
Keep the soil constantly moist or waterlogged; it tolerates standing water.
Soil
Heavy, wet, low-fertility soil, clay or sandy loam, including saline or brackish soils.
Temperature
Hardy in temperate climates, roughly down to -15 °C; tolerates heat in its native Mediterranean range.
How easy
Easy
Native range
Temp. & Subtrop.
Climate
temperate

About

Juncus acutus, the spiny rush, sharp rush or sharp-pointed rush, is a flowering plant in the monocot family Juncaceae. It is native to the Americas, Northern and Southern Africa, Western and Southern Europe and West Asia, and is found in a variety of wet habitats, such as bogs, fens, meadows, and salt marshes, and along the edges of ponds and lakes.

The sharp-pointed rush is a perennial plant that grows to a height of about 60 to 100 centimeters (24 to 39 inches). It has slender, cylindrical stems with narrow, pointed leaves and clusters of small, light brown flowers that bloom in the summer.

Safety

The dimeric phenanthrenoid 8,8'-bidehydrojuncusol and the monomeric juncusol and dehydrojuncusol can be isolated from J. acutus.

Where it grows

Found principally in low-lying damp, low fertility areas like sandy sea shores and dune slacks and coastal flats, occasionally in salt marshes and disturbed saline areas, mine dumps, lowland grassland and grassy woodland, riparian vegetation, freshwater wetland, and saline and subsaline wetlands

Other Juncus plants

Dwarf Rush · Arctic rush · Jointleaf rush · Mexican Rush · Baltic Rush · Toad rush · Bulbous rush · Canadian rush · Dudley's rush · Common rush · Swordleaf rush · Thread rush

Text excerpted from the Wikipedia article Juncus acutus 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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