Bolboschoenus maritimus

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sea club-rush

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Other common names

bayonet grass, ysbigfrwynen y morfa

Synonyms

Scirpus maritimus, Scirpus maritimus var. monostachyus

Aquatic Bogs Grass Like
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A large native sedge, common around the coast, growing to 1m or more tall, with trianglar stems and long, narrow, bright green, keeled leaves. Unbranched flowerheads consist of a single cluster of brown, cone-like spikelets 1-2cm long

Position

Full sun, Partial shade

Soil Types

Clay, Loam

Max Height

0.5-1 metres

Max Spread

1-1.5 metres

Size

Time to Maturity
2–5 years
Max Spread
1-1.5 metres
Max Height
0.5-1 metres

Growing Conditions

Clay Loam
Moisture
Poorly–drained
pH
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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Cyperaceae
Native to GB/Ireland
Yes
Foliage
Evergreen
Habit
Tufted
Genus
A genus of upright, perennial sedges with long, spreading rhizomes, woody tubers and cone-like flower spikelets. They are often found in coastal regions, tidal rivers, ditches and marshes
Name Status
Correct

How to Grow

Cultivation

Found in wet, muddy places around the coast, and tolerant of salty conditions. Needs permanently moist soil and can be planted as a partly submerged marginal in shallow water

Propagation

Propagate by seed or by division

Suggested planting locations and garden types

  • Wildlife gardens

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free