Juncus compressus

RHS Plant Profile
round-fruited rush

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Other common names

brwynen dalgron

Bogs Grass Like

A loosely tufted, semi-evergreen perennial, with a grass-like appearance that grows between 10 to 80 cm tall. It has narrow, flattened green leaves and produces small, light brown flowers from May to July

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 or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–facing or North–facing or South–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
Yes
Foliage
Evergreen, Semi 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
Europe, Asia

How to Grow

Cultivation

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

Propagation

Propagate by division from mid-spring to early summer

Suggested planting locations and garden types

  • Wildlife gardens

Pruning

No pruning required, tidy after flowering if necessary

Pests

Generally pest-free

Diseases

Generally disease-free