Juncus effusus Spiralis

Description

Juncus effusus ‘Spiralis’ – corkscrew rush

Botanical name: Juncus effusus f. spiralis
Common names: Corkscrew rush, spiral rush
Family: Juncaceae (rush family)
Plant type: Evergreen rush
Habit: Arching, spreading, quirky
Pot size: 2–3 litre pot
Eventual size: Approx. 30–45cm tall × 45cm spread
Foliage: Curious cylindrical dark green stems twisting and coiling like corkscrews; evergreen
Flowers: Small brownish flower clusters along the stems in summer
Scent: Not scented
Aspect / light: Full sun to partial shade
Soil: Reliably moist to wet; tolerates boggy ground, pond margins and shallow water; any pH
Hardiness: RHS H5 (hardy, to about −15°C); USDA zones 4–9
Exposure: Sheltered or open
Native range: Species native to the northern hemisphere including the UK
Toxicity / pet & child safety: Generally considered non-toxic to people and pets

Juncus effusus ‘Spiralis’, corkscrew rush, is a quirky, eye-catching plant whose dark green cylindrical stems twist and coil like corkscrews. Loving wet soil, it is superb at pond margins and in damp containers.

GardenAdvice notes

A curious and popular evergreen rush, the corkscrew rush is grown entirely for its novelty — its leafless, cylindrical dark green stems twist and spiral in every direction, like a tangle of green corkscrews. It thrives in the wet, boggy conditions of a pond margin or a permanently moist container, and makes a real talking point.

Growing & planting

Plant in spring or autumn in reliably moist to wet soil in full sun to partial shade — it is ideal at the margins of a pond, in a bog garden, or in a container standing in a saucer of water. It even grows in shallow water at the pond edge. Space about 40cm apart. Never let it dry out.

Care & maintenance

Low-maintenance provided it stays wet. Cut out any dead or straggly stems, and any plain straight stems that appear (reverting to the non-spiral form), to keep the curly effect. Divide congested clumps in spring. Its one essential is constant moisture.

Propagation

• Division: Lift and divide clumps in spring.

Pests & diseases

Generally trouble-free. Its one real need is moisture — it browns and dies back if allowed to dry out. Straight, non-spiral stems sometimes appear and are best removed. Otherwise little troubled by pests.

Uses in the garden

Superb at pond and stream margins, in bog gardens, in permanently wet containers and water features, and as a novelty feature on a patio, where its curling stems catch the eye.

Wildlife value

The dense stems provide cover at the water’s edge for frogs, insects and other small pond-side creatures.

Toxicity & safety

Corkscrew rush is generally regarded as non-toxic to people and pets.

GardenAdvice tip

The corkscrew rush is pure novelty and a guaranteed talking point, but the secret is to keep it permanently wet — in a bog, at the pond edge, or in a pot standing in a water-filled saucer. If it ever throws up plain straight stems, snip them out, as they can gradually take over from the twisty ones that give the plant its charm.

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