Juncus inflexus

RHS Plant Profile
hard rush

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Other common names

brwynen galed

Synonyms

Juncus glaucus
Juncus paniculatus

Grass Like
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Densely tufted, leafless perennial to 60cm tall, with matt, blue-green cylindrical stems and brown flowers produced in small, loose flowerheads on the ends of the stems from late spring to midsummer

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
0.5-1 metres

Growing Conditions

Clay Loam Sand
Moisture
Moist but well–drained or Poorly–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
South–facing or West–facing or East–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
Yes
Foliage
Evergreen
Habit
Clump forming
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
Plant Range
Eurasia

How to Grow

Cultivation

Grow in permanently moist, acid soil in sun or part shade, in boggy soil or in up to 8cm of water. Also thrives in heavy alkaline soils

Propagation

Propagate by seed in spring or by division from mid-spring to early summer

Suggested planting locations and garden types

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

Pruning

No pruning required, tidy after flowering if necessary

Pests

Generally pest-free

Diseases

Generally disease-free