Carex oshimensis Evergreen - Oshima Sedge
Carex oshimensis Evergreen - Oshima Sedge
Carex oshimensis Evergreen
Evergreen Sedge, Oshima Sedge, Japanese Sedge
Very beautiful plants, tall and healthy!
Kathy, 16/06/2025
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Description
Carex oshimensis Evergreen, also known as Oshima Sedge. It grows into a small, evergreen tuft with slightly dishevelled, dense, and ribbon-like bright green foliage. Its flowering in autumn is modest, with small greenish-brown spikes. This grass looks stunning in rockeries and borders. Over time, it covers the ground like a short grass meadow. It prefers cool to dry, fertile, but well-drained soils, in partial shade or even in the dry shade of undergrowth, with occasional watering.
Carex oshimensis Evergreen is a type of sedge that belongs to the Cyperaceae family. It is a small grass with a short rootstock that forms a very compact, dense, and upright tuft. It can grow up to 35 cm (13.8 in) tall and has a diameter of 30 cm (11.8 in). The leaves of this sedge are evergreen and have a grassy appearance. They can grow up to 40 cm (15.7 in) long and have tapering edges with drooping tips. They are bright spring green in colour and look very similar to a lawn. In autumn, short greenish spikes measuring 1 to 3 cm (1.2 in) appear among the foliage on thin stems measuring 15 cm (5.9 in) in height.
Oshima Everdi sedge is a small, refined herb with a minimalist style that will create a beautiful foliage bouquet on the border of a path or flowerbed. This plant brings a lot of lightness to the lush foliage of rodgersia and the feathers of ferns and pairs well with heucheras. As this grass tolerates dry shade, it naturally finds its place in the undergrowth, taking the place of adventives. It can also be planted in water gardens, on banks, or along the edge of a water feature, where it helps with stabilisation. You can plant it in mass in a contemporary or country garden for a beautiful, wild effect. This carex tolerates occasional drought well, making it an excellent choice for rockeries, cotton lavender and wormwood.
Carex oshimensis Evergreen - Oshima Sedge in pictures
Flowering
Foliage
Plant habit
Botanical data
Carex
oshimensis
Evergreen
Cyperaceae
Evergreen Sedge, Oshima Sedge, Japanese Sedge
Cultivar or hybrid
Planting and care
Carex oshimensis Evergreen is a type of grass that can grow well in various soil types as long as they are relatively moist and well-draining. It can withstand moderate droughts, making it an easy plant to cultivate and care for. This grass can also adapt to different sunlight exposures, although some watering may be necessary in dry woodland areas. It is vital to water the grass abundantly during planting and avoid using heavy fertilisers. Additionally, damaged foliage should be removed during vegetation, and the clump should be trimmed at the end of winter, just before the start of vegetation.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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