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Juncus effusus f. spiralis

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© RHS 2002

Characteristics

Plant type

Aquatic, Bog or Grass-like

Habit

Tufted

Resilience

Hardiness

old H4 (hardy)

Colour

Flower

Brown in Summer

Foliage

Dark Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

corkscrew rush

Family

Juncaceae


Juncus can be annuals, deciduous or evergreen perennials, forming clumps of narrow, often cylindrical leaves, with clusters of small brown flowers borne on leaf-like stems in summer

J. effusus f. spiralis is an evergreen perennial forming a clump of corkscrew-like, spirally curled, leafless stems, occasionally with small clusters of brown flowers in summer

Synonym(s)

  • Juncus effusus 'Spiralis'
  • Juncus effusus 'Spiralis' dwarf
  • Scirpus lacustris 'Spiralis'

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, West-facing or East-facing
  • Sheltered or Exposed

Cultivation

Grow in permanently moist, acid soil in sun or partial shade. May also be grown in very shallow water at pool margins

Soil

  • Poorly-drained
  • Acid
  • Sand, Clay or Loam

Propagation

Propagate by division from mid-spring to early summer

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds, Low Maintenance, City/Courtyard Gardens or Patio/Container Plants


How to care

Pruning

Remove dead foliage and old flowered stems in spring

Pests

Generally pest free

Diseases

Generally disease free