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CAREX oshimensis

Image of Carex oshimensis

Family

Cyperaceae

Botanical Name

CAREX oshimensis

Plant Common Name

Japanese Sedge

Special Notice

This entry has yet to be reviewed and approved by L2G editors.

General Description

Japanese sedge is grown for its dramatic grass-like, arching green leaves. It is an evergreen, herbaceous perennial native to Japan. It grows in an open clump of narrow arching leaf blades. Although many plant nurseries display and market Japanese sedge with ornamental grasses, sedges are more versatile, being tolerant of partial shade and drier soils while remaining evergreen in winter. Cut back the leaves in late winter to tidy the plant before the new leaves emerge in spring.

Grow Japanese sedge in partial sun to partial shade in well-drained, moist to slightly dry soil. Unlike many sedges, it is not happy with "wet feet" (soggy or waterlogged ground) or hot summers. Use it for its contrasts of color, texture and habit in containers, mixed beds and border designs, or to brighten a shady bed or border. Plant it as edging for walkways, or massed as a groundcover. It spreads slowly by rhizomes (underground stem) and one plant eventually becomes a colony of plants. Deer won't browse on the foliage.

Characteristics

  • AHS Heat Zone

    9 - 6

  • USDA Hardiness Zone

    6 - 9

  • Sunset Zone

    3a, 3b, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

  • Plant Type

    Sedge or Rush

  • Sun Exposure

    Partial Sun, Partial Shade

  • Height

    10"-20" / 25.4cm - 50.8cm

  • Width

    18"-24" / 45.7cm - 61.0cm

  • Bloom Time

    Spring

  • Native To

    Japan

Growing Conditions

  • Soil pH

    Acidic, Neutral, Alkaline

  • Soil Drainage

    Well Drained

  • Soil type

    Clay, Loam, Sand

  • Growth Rate

    Medium

  • Water Requirements

    Average Water

  • Habit

    Arching/Fountain-shaped

  • Seasonal Interest

    Spring, Summer, Fall, Winter

Ornamental Features

  • Flower Interest

    Insignificant

  • Flower Color

    Brown

  • Fruit Color

    Sandy Brown

  • Foliage Color (Spring)

    Dark Green

  • Foliage Color (Summer)

    Dark Green

  • Foliage Color (Fall)

    Dark Green

  • Foliage Color (Winter)

    Dark Green

  • Fragrant Flowers

    No

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Flower Petal Number

    Single

  • Repeat Bloomer

    No

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    Yes

  • Foliage Texture

    Fine

  • Foliage Sheen

    Glossy

  • Evergreen

    Yes

  • Showy Bark

    No

Special Characteristics

  • Usage

    Container, Edging, Foundation, Groundcover, Mixed Border, Rock Garden / Wall

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Self-Sowing

    No