Juncus effusus f. spiralis

RHS Plant Profile
corkscrew rush

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corkscrew rush RHS 2002
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Synonyms

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

Grass Like Aquatic Bogs
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An evergreen perennial forming a clump of corkscrew-like, spirally curled, leafless stems, occasionally with small clusters of brown flowers in summer

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Clay Loam Sand
Moisture
Poorly–drained
pH
Acid

Position

Full sun Partial shade
Aspect
South–facing or East–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Juncaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Tufted
Genus
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
Name Status
Correct

How to Grow

Cultivation

Grow in permanently moist, acid soil in sun or partial shade. May also be grown in very shallow water at pool margins. See pond plants and bog gardens for further advice

Propagation

Propagate by division from mid-spring to early summer

Suggested planting locations and garden types

  • Cottage and informal garden
  • Patio and container plants
  • City and courtyard gardens
  • Low Maintenance
  • Flower borders and beds

Pruning

Remove dead foliage and old flowered stems in spring

Pests

Generally pest-free

Diseases

Generally disease-free