Japanese Sedge

(Carex oshimensis)

Japanese Sedge (Carex oshimensis)

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Estimated Native Range
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Summary

Carex oshimensis, commonly known as Japanese sedge, is a perennial herbaceous plant in the genus Carex, native to the understory of moist, forested areas on the Tokyo Islands of Japan. It typically grows to 50 cm (20 in) tall and broad, with a clumping habit that makes it an effective ground cover. The foliage is striking, with a broad yellow stripe down the center of each dark green leaf, which adds visual interest throughout the year. The ’Evergold’ cultivar is particularly noted for its variegated leaves and has received the Royal Horticultural Society’s Award of Garden Merit for its garden performance.

Japanese sedge is valued for its ease of maintenance and its ability to thrive in moist soils, making it a popular choice for planting in sun or partial shade in urban gardens, borders, and as a non-spreading ground cover. It requires medium amounts of water and prefers soils with medium drainage. While it is generally pest-free, it can suffer from rust or root rot if conditions are too wet. It is not known to be invasive and does not have aggressive roots, making it a safe choice for planting near structures or other garden plants.CC BY-SA 4.0

Plant Description

  • Plant Type: Grass
  • Height: 1-1.5 feet
  • Width: 1-1.5 feet
  • Growth Rate: Moderate
  • Flower Color: N/A
  • Flowering Season: Spring, Summer
  • Leaf Retention: Evergreen

Growth Requirements

  • Sun: Part Shade
  • Water: Medium
  • Drainage: Medium

Common Uses

Bank Stabilization, Bird Garden, Border Plant, Butterfly Garden, Deer Resistant, Drought Tolerant, Groundcover, Low Maintenance, Potted Plant, Rock Garden, Salt Tolerant, Street Planting, Water Garden

Natural Habitat

Understory of moist, forested areas on the Tokyo Islands of Japan

Other Names

Common Names: Oshimastarr , Oshima Kan Suge

Scientific Names: Carex oshimensis , Carex oshimensis f. variegata , Carex hachijoensis

GBIF Accepted Name: Carex oshimensis Nakai