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Evergold Sedge Carex oshimensis

Phonetic Spelling
KAY-reks oh-shee-MEN-sis
Description

Oshima sedge is a grass-like herbaceous perennial in the sedge family (Cyperaceae). It is native to Oshima Island in Japan. The species epithet is Latin and means “of Oshima.”

Plant it in full sun to partial shade. It prefers rich, moist to wet soils and especially moist if planted in the full sun. Some temporary flooding is tolerated, but it does not tolerate drought.

This plant does not spread, but the clump will slowly increase in size over the years. The plant can be lifted and divided in the autumn or spring. This plant is resistant to browsing by deer.  

Mass plant this sedge as a groundcover, or use it as an accent or specimen plant. It works well in a border front and can withstand the shade of woodland garden plantings. It is ideal for riparian areas, rain gardens or pond margins. It works well in containers. 

Insects, Diseases, and Other Plant Problems:  No serious problems, although aphids are sometimes troublesome.

 

More information on Carex.

See this plant in the following landscapes:
Dry Rock Stream Garden Collector’s Garden Shaded Slope A Sampling of Shade Gardens
Cultivars / Varieties:
  • EverColor® Everest ‘CarFit01’
    Mounding plant with green leaves with white margins.
  • EverColor® 'Everillo'
    Leaves are lime green (slightly darker at the base)
  • Feather Falls™
    Larger than other cultivars; leaves are dark green with cream margin
EverColor® Everest ‘CarFit01’, EverColor® 'Everillo', Feather Falls™
Tags:
#evergreen#sedge#colorful leaves#mass planting#deer resistant#herbaceous perennial#variegated#groundcover#rock garden#grass-like#pollinator plant#wet soils tolerant#HS302#drought intolerant#container plant#foot traffic intolerant#wildlife friendly
 
Cultivars / Varieties:
  • EverColor® Everest ‘CarFit01’
    Mounding plant with green leaves with white margins.
  • EverColor® 'Everillo'
    Leaves are lime green (slightly darker at the base)
  • Feather Falls™
    Larger than other cultivars; leaves are dark green with cream margin
EverColor® Everest ‘CarFit01’, EverColor® 'Everillo', Feather Falls™
Tags:
#evergreen#sedge#colorful leaves#mass planting#deer resistant#herbaceous perennial#variegated#groundcover#rock garden#grass-like#pollinator plant#wet soils tolerant#HS302#drought intolerant#container plant#foot traffic intolerant#wildlife friendly
  • Attributes:
    Genus:
    Carex
    Species:
    oshimensis
    Family:
    Cyperaceae
    Life Cycle:
    Perennial
    Recommended Propagation Strategy:
    Division
    Seed
    Country Or Region Of Origin:
    Japan
    Wildlife Value:
    This plant supports various Satyr larvae.
    Dimensions:
    Height: 1 ft. 0 in. - 1 ft. 6 in.
    Width: 1 ft. 0 in. - 1 ft. 5 in.
  • Whole Plant Traits:
    Plant Type:
    Ground Cover
    Herbaceous Perennial
    Ornamental Grasses and Sedges
    Habit/Form:
    Clumping
    Dense
    Growth Rate:
    Medium
    Maintenance:
    Low
    Texture:
    Fine
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Partial Shade (Direct sunlight only part of the day, 2-6 hours)
    Available Space To Plant:
    12 inches-3 feet
    USDA Plant Hardiness Zone:
    5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
  • Fruit:
    Fruit Color:
    Brown/Copper
    Fruit Type:
    Achene
    Fruit Length:
    < 1 inch
    Fruit Width:
    < 1 inch
  • Flowers:
    Flower Color:
    Brown/Copper
    Flower Inflorescence:
    Insignificant
    Flower Bloom Time:
    Spring
    Summer
    Flower Size:
    < 1 inch
  • Leaves:
    Leaf Color:
    Green
    Variegated
    Leaf Feel:
    Glossy
    Smooth
    Leaf Value To Gardener:
    Showy
    Deciduous Leaf Fall Color:
    Cream/Tan
    Gold/Yellow
    Leaf Type:
    Sheath
    Simple
    Leaf Arrangement:
    Alternate
    Leaf Shape:
    Lanceolate
    Linear
    Leaf Margin:
    Entire
    Hairs Present:
    No
    Leaf Length:
    > 6 inches
    Leaf Width:
    < 1 inch
    Leaf Description:
    Most forms in cultivation are variegated. Dark green margins with broad cream white to cream yellow center.
  • Stem:
    Stem Is Aromatic:
    No
  • Landscape:
    Landscape Location:
    Container
    Rock Wall
    Woodland
    Landscape Theme:
    Nighttime Garden
    Rain Garden
    Rock Garden
    Water Garden
    Winter Garden
    Design Feature:
    Accent
    Border
    Mass Planting
    Attracts:
    Small Mammals
    Songbirds
    Resistance To Challenges:
    Deer
    Wet Soil