Bolboschoenus maritimus

RHS Plant Profile

sea club-rush

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Other common names

bayonet grass, ysbigfrwynen y morfa

Synonyms

Scirpus maritimus var. monostachyus
Scirpus maritimus

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

Size

Time to Maturity: 2–5 years

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
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