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Grass · Cyperaceae family

Japanese sedge

Carex morrowii

Part shade to shade 0.3–0.45 m × 0.3–0.4 m to −26 °C

In short a 10-second read

LightPart shade to shade
Size0.3–0.45 m
spacing 35 cm
PlantingMarch–May, September–October
WinterNo winter protection

Where to plant and how much to water

Light, soil and water.

It grows best in part shade to shade, in average to moist soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
average to moisthumus-richloamy

Watering

keep the soil evenly moistless when it rains

Frost

−26 °C
no winter protectiongreen in winter too

How much space it takes

Mature size.

The mature plant next to a person (175 cm).

50 cm1 m1.5 m0.3–0.45 mspread 0.3–0.4 m
0.3–0.45 m× spread 0.3–0.4 m

Plant 35 cm apart.

Reaches maturity in about 2–5 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Months for Central Europe. The line shows the current month.

The year at a glance

Planting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
Planting
Now, in October: a good time for planting (container plant).
JanFebMarAprMayJunJulAugSepOctNovDec

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–May, September–October

Feeding

Nutrition.

No feeding

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

What you will see

Colonies of tiny insects on shoots and buds, sticky honeydew, curled leaves.

When to look

Spring and summer

How to protect

  1. Prevention
    • Check plants regularly from spring.
    • Encourage ladybirds, hoverflies, lacewings and parasitic wasps.
  2. By hand as soon as it appearsRub off colonies by hand or wash them off with a jet of water.
  3. Biological spring to summerRelease lacewing larvae, aphid midge larvae or ladybirds.
  4. Gentle spray in a heavy infestation, repeatPotassium soap (fatty acids) or plant oil.
  5. Chemical — only when nothing else helps only as a last resortA product authorised in your country against aphids.
Aphidspest · spring and summer

What you will see

Colonies of tiny insects on shoots and buds, sticky honeydew, curled leaves.

When to look

Spring and summer

How to protect

  1. Prevention
    • Check plants regularly from spring.
    • Encourage ladybirds, hoverflies, lacewings and parasitic wasps.
  2. By hand as soon as it appearsRub off colonies by hand or wash them off with a jet of water.
  3. Biological spring to summerRelease lacewing larvae, aphid midge larvae or ladybirds.
  4. Gentle spray in a heavy infestation, repeatPotassium soap (fatty acids) or plant oil.
  5. Chemical — only when nothing else helps only as a last resortA product authorised in your country against aphids.
More about this problem

What you will see

Softening of the crown and roots; the plant wilts and browns despite watering.

How to protect

  1. Prevention
    • Free-draining soil, no waterlogging (especially in winter).
    • Do not plant too deep.
  2. By hand at the first symptomsDig up the affected plant; improve the soil with drainage; do not replant in the same place.
Root and crown rotdisease

What you will see

Softening of the crown and roots; the plant wilts and browns despite watering.

How to protect

  1. Prevention
    • Free-draining soil, no waterlogging (especially in winter).
    • Do not plant too deep.
  2. By hand at the first symptomsDig up the affected plant; improve the soil with drainage; do not replant in the same place.
More about this problem
Sources (4)

What to combine it with

Same needs, different flowering.

They share the same sun and soil and flower in other months — so the bed flowers for longer.

European wild ginger

European wild ginger

0.08–0.15 m
✓flowers March–May
✓lower — for the front
barrenwort

barrenwort

0.15–0.3 m
✓flowers April–May
✓lower — for the front
Lenten rose

Lenten rose

0.3–0.46 m
✓flowers January–April
✓taller — for the back

Ready-made Studio combinations with this plant

Click a combination — the Studio opens a new raised bed with it already planted.

Woodland shade — Siebold's hostaWoodland shade — male fernWoodland shade — Japanese sedgeWoodland shade — European wild gingerWoodland shade — common lungwort
Woodland shadeHostas, fern and sedges with wild ginger — calm green planting for a spot without sun.Open in the Studio

Frequently asked

Quick answers.

Does Japanese sedge tolerate shade?

Yes, it tolerates full shade.

How much space does Japanese sedge need?

At maturity 0.3–0.4 m wide and 0.3–0.45 m tall; recommended spacing 35 cm.

Aphids — what can you do?

Check plants regularly from spring. Rub off colonies by hand or wash them off with a jet of water.

Root and crown rot — what can you do?

Free-draining soil, no waterlogging (especially in winter). Dig up the affected plant; improve the soil with drainage; do not replant in the same place.

Sources (9) Checked 24 October 2026

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