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Grass Like

Carex oshimensis

Japanese sedge

Durable, densely tufted, clump-forming, evergreen perennial sedge, 30-40cm tall, with fine-textured, glossy green foliage. Carries inconspicuous brown flower spikes on stems to 15cm long, within the foliage, in mid and late spring

Synonyms

Carex morrowii misapplied

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Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

South–facing or West–facing or East–facing

Exposure

Exposed or Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Cyperaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Clump forming, Tufted
Genus: Carex can be deciduous or evergreen, rhizomatous or tufted perennials, with triangular stems bearing linear or strap-shaped leaves and short or long spikes of tiny green or brown flowers
Name status: Correct
Plant range: Japan

How to grow

Cultivation

Grow in fertile moist but well-drained soil in full sun or part shade. See ornamental grasses cultivation

Propagation

Propagate by seed in early spring or by division in mid spring to early summer

Suggested planting locations and garden types

City and courtyard gardens
Coastal
Cottage and informal garden
Gravel garden
Patio and container plants
Low Maintenance
Flower borders and beds
Garden edging

Pruning

Cut out any dead leaves on evergreen species in summer

Pests

May be susceptible to aphids

Diseases

Generally disease-free

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