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Carex riparia

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© RHS 2002

Characteristics

Plant type

Aquatic, Bog or Grass-like

Habit

Tufted

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Dark Brown in Summer

Foliage

Green and Grey/Silver in Autumn, Spring and Summer

Fruit

Dark Brown in Summer

Size

Ultimate height

1-1.5 metres

Ultimate spread

1-1.5 metres

Time to ultimate height

2-5 years


Preferred common name

greater pond sedge

Family

Cyperaceae


Carex can be deciduous or evergreen, rhizomatous or tufted perennials, with triangular stems bearing linear or strap-shaped leaves and short or long spikes of tiny green or brown flowers

C. riparia is a vigorously spreading rhizomatous perennial with linear, glaucous green leaves and tall stems bearing stout, erect, dark brown flowering spikes in early summer

Other common names

  • greater bank sedge

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

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

Cultivation

Grow in fertile, moist or wet soil in sun or partial shade

Soil

  • Poorly-drained
  • Neutral, Acid or Alkaline
  • Clay or Loam

Propagation

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

Suggested planting locations and garden types

Low Maintenance, Wildflower meadow or Wildlife Gardens


How to care

Pruning

Cut back after flowering

Pests

Aphids sometimes attack stem bases

Diseases

Generally disease free