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Carex morrowii

Carex morrowii, Cyperaceae

Sources last read 14 September 2026.

Not yet rated How forgiving it is has not been judged here yet.

Also called Everglow Sedge, Ice Dance Sedge, Japanese Sedge, Kan suge and Marrow's Sedge.

Carex morrowii (Carex morrowii), the whole plant.
Daderot, CC0 · Wikimedia Commons

Toxicity is partly unassessed

  • Not assessed for cats. This plant is not on the ASPCA list. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.
  • Not assessed for dogs. This plant is not on the ASPCA list. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.
  • Not assessed for people. RHS publishes no harm statement for this plant. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.

What the sources say about its care

Sources file this plant under other names: Carex morrowii 'Fisher's Form' (v). Citations below point at the name its source uses.

Light
Full sun, Partial shade
RHS · read 13 September 2026
Water
Moist but well-drained or Well-drained
RHS · read 13 September 2026
Humidity

No source read publishes a humidity figure for any plant on this site. What follows is general guidance for foliage plants.

ASHRAE recommends indoor relative humidity between 30% and 60% 30–60%
Penn State Extension · read 13 September 2026
Temperature

How cold this tolerates, not what it prefers. No source read for this site publishes a preferred range for a plant indoors.

H7 — colder than -20°C
RHS · read 13 September 2026
Soil
Chalk, Clay, Loam, Sand; pH Acid or Alkaline or Neutral
RHS · read 13 September 2026
Toxic to cats
Not on the ASPCA list. That is not a finding of safety.
ASPCA · read 13 September 2026
Toxic to dogs
Not on the ASPCA list. That is not a finding of safety.
ASPCA · read 13 September 2026
Harmful to people
No statement of harm to people is published for this plant; that absence is not evidence it is safe.
RHS · read 13 September 2026

Routine care

Propagation
By division or seed.
NC State Extension · read 13 September 2026
Divide between mid spring and early summer.
RHS · read 13 September 2026
Pruning
On evergreen species, remove dead leaves in summer.
RHS · read 13 September 2026
Pests and diseases
Aphids can occur. Diseases: usually none.
RHS · read 13 September 2026

Move something and watch

Loading the simulator. It needs JavaScript; the care table above does not.

Close view of Carex morrowii (Carex morrowii) foliage.
Close upSalicyna, CC BY-SA 4.0 · Wikimedia Commons

About the plant

Carex morrowii, the kan suge, Morrow's sedge, Japanese grass sedge or Japanese sedge, is a species of flowering plant in the family Cyperaceae. It is native to central and southern Japan, and has been introduced to Belgium, Denmark and Austria.

From Wikipedia, CC BY-SA 4.0 · read 13 September 2026

Native range
C. & S. Japan
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Central & S. Japan
NC State Extension · read 13 September 2026
Climate
temperate
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Growth form
perennial or rhizomatous geophyte
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Ground Cover, Herbaceous Perennial, Ornamental Grasses and Sedges; habit clumping, dense, mounding
NC State Extension · read 13 September 2026
Clump forming, Tufted (evergreen)
RHS · read 13 September 2026
Size
Height 12–18 in; width 12–18 in
NC State Extension · read 13 September 2026
Height 0.1-0.5 metres; spread 0.1-0.5 metres after 2–5 years
RHS · read 13 September 2026
Flowering
Flowers green; blooms in spring
NC State Extension · read 13 September 2026
Flowers green in spring; brown in spring
RHS · read 13 September 2026

More of the Cyperaceae family

Plants with similar care

Sources

What this does not cover

The figures above are what published sources say, not measurements of the plant in your room. They say nothing about your pot size, your water, the season, or how far from the glass the plant stands, and those decide more than any figure here does.

Humidity has no species figure because no source read for this site publishes one, and the only temperature published for this plant is a cold floor. The simulator fills those gaps with general figures for its kind of plant, marked as general and listed on how we read sources. Where a toxicity row says the plant was not assessed, that is the absence of a finding and not a finding of safety.

If something is already wrong, the diagnosis tool asks about the soil, the window and the watering, which is where the answer usually is.