Carex Everest

Description

Carex oshimensis ‘Everest’ – Japanese sedge

Botanical name: Carex oshimensis ‘Everest’
Common names: Japanese sedge
Family: Cyperaceae (sedge family)
Plant type: Evergreen sedge
Habit: Low, arching, mound-forming
Pot size: 2–3 litre pot
Eventual size: Approx. 30cm tall × 40cm spread
Foliage: Arching dark green leaves crisply edged with clean white; evergreen
Flowers: Insignificant brownish flower spikes; grown for its foliage
Scent: Not scented
Aspect / light: Full sun to partial shade
Soil: Moist but well-drained, humus-rich; any pH
Hardiness: RHS H6 (hardy, to about −20°C); USDA zones 5–9
Exposure: Sheltered or open
Native range: Selected form; the species is native to Japan
Toxicity / pet & child safety: Generally considered non-toxic to people and pets

Carex oshimensis ‘Everest’ is a neat evergreen sedge with arching dark green leaves crisply edged in clean white. Bright and tidy year-round, it is superb for edging, containers and lightly shaded borders.

GardenAdvice notes

A neat, mound-forming evergreen sedge, ‘Everest’ has arching dark green leaves boldly and crisply edged with clean white, giving a fresh, bright effect all year. Hardy, reliable and evergreen, it is excellent for edging, groundcover and containers in sun or partial shade, and keeps its good looks through winter.

Growing & planting

Plant in spring or autumn in moist but well-drained, humus-rich soil, in full sun to partial shade. Space about 40cm apart; it establishes into a neat clump. Improve very dry or very wet ground before planting.

Care & maintenance

Sedges are not cut hard to the ground like many grasses. Instead, in spring comb through the clump with gloved fingers or a spring-tined rake to pull out the dead leaves, and trim off any tatty foliage; a very untidy plant can be cut back harder to encourage fresh growth. Water in dry spells, as most sedges dislike drying out, and divide congested clumps in spring.

Propagation

• Division: Lift and divide clumps in spring — quick, easy and the standard method.
• Seed: Species can be raised from seed, though named forms are best from division.

Pests & diseases

Generally trouble-free. Aphids occasionally occur, and clumps can rot or die out in the centre in cold, wet, poorly drained conditions. Good drainage and combing out dead growth keep plants healthy.

Uses in the garden

Ideal for edging paths and borders, as evergreen groundcover, in containers and mixed plantings, and in lightly shaded spots, where its white-edged foliage brightens the scene year-round.

Wildlife value

The dense tufts provide ground-level cover for insects and small creatures, and sedges support a range of wildlife in damp and naturalistic plantings.

Toxicity & safety

Sedges are generally regarded as non-toxic to people and pets.

GardenAdvice tip

‘Everest’ is one of those quietly indispensable plants — evergreen, tidy, and bright with its clean white leaf edges, equally at home edging a border, filling a pot or lighting up light shade. Don’t cut it down like a grass; just comb out the dead leaves in spring and it will look smart the year round.

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