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botanical name:
Cyperus rotundus
Cyperus rotundus © Deeproot Plant Base
common name:  Sea-urchin Grass, Purple Nutsedge, Coco-grass
family:  Cyperaceae
characteristics: perennial
height: 0.60m
width: 1.00m
growth rate: fast
growth habit: grassy
leaf colour: green
flower colour: purple
fruit colour: brown
stem/bark: green
main season: Summer
medicinal symbol medicinal
aspect: full sun, part shade
conditions: moist soil, wet/waterlogged soil, sandy soil
preferred soil pH: any
minimum temp: -18°C
USDA zone: 7 to 10
Narrow, ridged, grass-like leaves emerge in threes from tuberous roots which may spread vigorously. The tubers are white at first, ageing to dark brown and rounded or oval, somewhat reminiscent of nuts in appearance. The flowering stems are triangular in section and bear spikelets of small reddish-purple or reddish-brown flowers.

Moist or damp soil, preferring a sandy loam, or as a pond marginal in shallow water up to 30cm deep, in full sun or part shade.
Cut back dead material in late autumn.
Often becomes very invasive.

From seed or by division.

Used as medicinally for the treatment of nausea, fever and inflammation and particularly in traditional Chinese and Ayurvedic medicine. Several active substances have been identified that may explain its action.

other notes:
Native to tropical and warm temperate areas.

Problematic agricultural weed in many areas, very difficult to eradicate.
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