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Carex morrowii Irish Green

Carex morrowii subsp. foliosissima Irish Green
Japanese Sedge, Morrow's Sedge

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This carex is a small ground cover grass with beautiful evergreen foliage. The astonishing grass is a shiny green with bluish reflections. This perennial forms a graceful tuft, both upright and trailing, with a flexible appearance. Ideal for covering the ground in cool and shady areas of the garden. It flowers in summer with white-cream spikes that turn brown with age. Plant in neutral to acidic, moist to wet soil, in partial shade or even in full shade.
Flower size
2 cm
Height at maturity
30 cm
Spread at maturity
30 cm
Exposure
Sun, Partial shade, Shade
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil, Damp soil
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Best planting time March, October
Recommended planting time February to April, September to November
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Flowering time July to August
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Description

Carex morrowii 'Irish Green', also known as Japanese Sedge, is a low-growing grass-like plant that stands out with its evergreen foliage, which is a very bright green with bluish reflections. This perennial forms a graceful clump, both erect and trailing, with a flexible appearance. Its summer flowering is in the form of small white-cream spikes that turn brown with age. It is a hardy and robust plant, which will grow among the roots of trees in shaded areas. It should be planted in neutral to acidic soil, preferably moist to wet, even in dense shade.

 

Carex morrowii 'Irish Green' is a sedge belonging to the large Cyperaceae family. It is native to Japan. This small grass with short rhizomes forms a soft clump with a compact, erect, and trailing habit, reaching about 35cm (14in) in all directions. Its evergreen leaves are arched, sheathing at the base, about 3mm (1in) wide and approximately 40cm (16in) long. Their edges are tapered and their tips drooping. They have a particularly shiny medium green colour with bluish reflections when backlit. In July-August, short cream spikes measuring 2 to 4cm (1 to 2in) appear among the foliage on thin stems about 35cm (14in) tall. At maturity, they turn brown.

 

'Irish Green' is a small 'herb' with refined foliage and a minimalist style, which will form a dense bouquet of foliage in shady areas, covering the ground and discouraging weeds. It can be paired with Milium effusum 'Aureum', Geranium vivace 'Czackor', or even Vinca 'Atropurpurea'. It does not require the presence of another plant by its side, but it will bring lightness to the lush foliage of rodgersias, the fronds of ferns, and also pairs well with colourful heucheras. As this grass-like plant prefers moist to wet soils, it will naturally find its place in water gardens, among moss-covered stones arranged on banks or at the edge of a water feature, where it will contribute to soil stabilisation. It can also be placed along the edges of perennial borders. For a beautiful wild effect, plant it en masse in contemporary or rustic gardens.

Carex morrowii Irish Green in pictures

Carex morrowii Irish Green (Foliage) Foliage

Flowering

Flower colour insignificant
Flowering time July to August
Inflorescence Spike

Foliage

Foliage persistence Evergreen
Foliage colour green

Plant habit

Height at maturity 30 cm
Spread at maturity 30 cm
Growth rate normal

Botanical data

Genus

Carex

Species

morrowii subsp. foliosissima

Cultivar

Irish Green

Family

Cyperaceae

Other common names

Japanese Sedge, Morrow's Sedge

Origin

Cultivar or hybrid

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Planting and care

Carex morrowii 'Irish Green' prefers moist soils that are not too chalky. It tolerates wet areas well. It requires a semi-shaded or even shaded exposure, sheltered from direct sunlight. It tolerates moderate and short periods of drought quite well. This easy-to-grow grass requires very little maintenance. Plant when risk of frost has gone. Water abundantly when planting. Avoid heavy fertiliser inputs. Remove damaged foliage during the growing season and clean the clump at the end of winter, just before the start of vegetation.

Planting period

Best planting time March, October
Recommended planting time February to April, September to November

Intended location

Suitable for Shaded rockery, Woodland edge, Undergrowth
Type of use Edge of border, Slope
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Planting density 5 per m2
Exposure Sun, Partial shade, Shade
Soil pH Acidic, Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Moist soil, Damp soil, well-draining

Care

Pruning instructions Comb the old foliage with a rake or by hand. This grass does not tolerate pruning.
Pruning Pruning recommended once a year
Pruning time February to April
Disease resistance Very good
Overwinter Can be left in the ground

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