Knotsheath sedge is a clump-forming, rhizomatous sedge native to southern Canada and the northern United States, grown mainly in wet soils for rain gardens, erosion control and restoration. It does best kept consistently moist, in full sun to light shade.
Family
Cyperaceae (Cyper family)
Grows as
Grass
Light
Full sun, Part shade
Water
Keep soil consistently moist to wet; it tolerates standing water at the edges of ponds and streams.
Soil
Moist to wet loam or clay, rich in organic matter.
Temperature
Hardy to around -30 °C in its native range; keep roots moist in summer heat.
How easy
Easy
Native range
Canada to N. & WC. U.S.A.
Climate
temperate
About
Carex retrorsa, (commonly known as knotsheath sedge, deflexed bottlebrush sedge, or retrorse sedge), is a widespread species of flowering plant in the family Cyperaceae, native to southern Canada and the northern United States.
Where it grows
Carex retrorsa thrives in stream and lake shores, marshes, swamps, water meadows and alongside waterways. Preferring wet areas and tolerant of some shade, it is available from speciality nurseries for such uses as ecological restoration projects, erosion control, and rain gardens.
Text excerpted from the Wikipedia article Carex retrorsa 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.