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Bolboschoenus robustus - (Pursh) Soják

Common Name Sturdy Bulrush
Family Cyperaceae
USDA hardiness 6-10
Known Hazards Harvest only from clean saltmarshes away from storm drains and legacy contamination. Rinse corms to remove surface salts; parboiling in fresh water reduces residual salinity.
Habitats Native to Atlantic and Gulf coasts and parts of the Pacific coast of North America; also reported in coastal South America. In the Southwest it is largely restricted to coastal California and estuarine complexes.
Range S. & E. U.S.A. to Mexico, Caribbean to S. Tropical America.
Edibility Rating    (4 of 5)
Other Uses    (2 of 5)
Weed Potential No
Medicinal Rating    (0 of 5)
Care (info)
Fully Hardy Wet Soil Water Plants Full sun
Bolboschoenus robustus Sturdy Bulrush


Krzysztof Ziarnek, Kenraiz Creative Commons Attribution-Share Alike 4.0
Bolboschoenus robustus Sturdy Bulrush
Krzysztof Ziarnek, Kenraiz Creative Commons Attribution-Share Alike 4.0

 

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Summary

Sturdy Bulrush or Saltmarsh bulrush is the coastal, brackish-tolerant counterpart to cosmopolitan bulrush, prized for its edible corms and serviceable seeds in tidal marshes and lagoon edges. It anchors saline substrates, feeds waterfowl, and offers one of the few starchy roots obtainable near the ocean’s edge. USDA Zones 6–10. Clumps reach 0.6–1.5 m tall, spreading 0.6–2 m by rhizomes and corm offsets.


Physical Characteristics

 icon of manicon of flower
Bolboschoenus robustus is an evergreen Perennial growing to 1 m (3ft 3in) by 1 m (3ft 3in) at a fast rate.
See above for USDA hardiness. It is hardy to UK zone 7 and is not frost tender. The flowers are pollinated by Wind.
It is noted for attracting wildlife.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: neutral and basic (mildly alkaline) soils and can grow in very alkaline and saline soils.
It cannot grow in the shade. It prefers wet soil and can grow in water.

UK Hardiness Map US Hardiness Map

Synonyms

Homotypic Synonyms: Schoenoplectus robustus (Pursh) M.T.Strong. Scirpus maritimus var. macrostachyus Michx. Scirpus maritimus var. robustus (Pursh) Kük. Scirpus robustus Pursh

Plant Habitats

Edible Uses

Edible Uses & Rating: Corms are the principal food part: starchy, mild, and satisfying when roasted, boiled, or dried and milled. Seeds contribute a nutty flour after winnowing and roasting. In coastal foraging contexts it is among the best carbohydrate sources available [2-3]. Edibility rating: 4.5/5 for corms; overall 4/5 given habitat limits. Taste, Processing & Kitchen Notes: Fresh corms are firm to hard. Roasting softens and coaxes a chestnut-potato profile with faint sweetness. Boiling followed by mashing yields a coarse puree; drying and milling yield a pleasantly nutty, pale flour good for dumplings or as a thickener. Seeds benefit from roasting before milling to remove any brackish note [2-3]. Seasonality (Phenology): Vegetative growth begins in spring as marsh temperatures rise. Flowering and seed set occur from summer to early autumn. Corms are fullest in late autumn into winter, after aerial parts senesce, mirroring carbohydrate allocation cycles [2-3]. Safety & Cautions (Food Use): Harvest only from clean saltmarshes away from storm drains and legacy contamination. Rinse corms to remove surface salts; parboiling in fresh water reduces residual salinity. Harvest & Processing Workflow: For corms, probe at the base of senesced culms in late autumn, levering up with a narrow spade. Trim, wash, and either roast whole or slice and boil. For flour, slice, dehydrate to brittleness, and mill. For seeds, clip mature heads, dry, rub free, winnow, roast, and grind. Look-Alikes & Confusion Risks: Easily confused with Bolboschoenus maritimus. Both have corms. Local floras separate them by subtle achene morphology and bract metrics; for foraging, the distinction is less critical than correct genus. Distinguish from non-corm-forming Schoenoplectus by digging and checking for true corms. Traditional/Indigenous Use Summary: Coastal peoples have long used corms as starchy food and stems/leaves for matting and thatch. Waterfowl hunting cultures valued dense stands as feeding grounds that concentrated birds seasonally.

References   More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.


None Known

References   More on Medicinal Uses

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Other Uses

Stems/leaves for matting and thatch. Waterfowl hunting cultures valued dense stands as feeding grounds that concentrated birds seasonally. Ecology & Wildlife: Corms and achenes are eaten by dabbling ducks and geese; stands create nursery habitat for fish and invertebrates in shallow pannes and creeks; root systems improve water clarity by binding fines. Practical chiefly in coastal restoration.

Special Uses

References   More on Other Uses

Cultivation details

Identification & Habit: A perennial sedge with triangular stems and a compact, many-spikelet inflorescence near the stem tip, subtended by leaf-like bracts. The key field character is the presence of basal corms—swollen, starchy storage organs that form on short rhizomes at the stem bases. Leaves are reduced and sheathing; plants form tight clumps in intertidal or supratidal zones. Growing Conditions: Thrives in brackish to saline marshes, tidal flats, and lagoon margins with full sun. Tolerates fluctuating salinity and periodic inundation. Best in silty clays and organic mucks with neutral to alkaline reaction. Habitat & Range: Native to Atlantic and Gulf coasts and parts of the Pacific coast of North America; also reported in coastal South America. In the Southwest it is largely restricted to coastal California and estuarine complexes. Size & Landscape Performance: Forms dense clumps that stabilize tidal margins and trap sediments. In living shorelines it supports wave attenuation and accretion, pairing well with Spartina/Distichlis in zonation schemes. Cultivation (Horticulture): Practical chiefly in coastal restoration. Plant corm divisions or rhizome chunks into soft intertidal soils at low tide. Maintain hydrologic regime allowing occasional exposure and flushing. Pests & Problems: Storm events can uproot immature plantings. Prolonged hypersalinity with no freshwater pulses may stunt growth. Grazing by geese can clip young shoots. Cultivar/Selection Notes: No named cultivars; select local ecotypes adapted to specific tidal ranges and salinity bands. Very similar to B. maritimus in floral biology. Primarily wind-pollinated in coastal marshes; animals are not central to pollen movement.

References   Carbon Farming Information and Carbon Sequestration Information

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Plant Propagation

Divide corms in late winter or plant freshly dug corm-rhizome pieces in early spring. Seed can be used with cold-moist stratification; broadcast onto saturated mudflats and protect from scouring.

Other Names

If available other names are mentioned here

Bolboschoenus robustus (Saltmarsh Bulrush / Sturdy Bulrush)

Native Range

US. USA. Alabama, Argentina Northeast, Arkansas, Bahamas, Bermuda, California, Connecticut, Delaware, Florida, Georgia, Guyana, Louisiana, Maine, Maryland, Massachusetts, Mexico Northwest, Mexico Southeast, Mississippi, New Hampshire, New Jersey, New York, North Carolina, Paraguay, Pennsylvania, Rhode I., South Carolina, Suriname, Texas, Uruguay, Venezuela, Virginia

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it's worth checking.

Low inland; moderate on suitable tidal flats where it can form dominant stands (a desired trait in restoration). It does not leap into uplands.

Conservation Status

IUCN Red List of Threatened Plants Status : Bolboschoenus robustus is listed as Least Concern.

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Bolboschoenus maritimusCosmopolitan BulrushPerennial1.0 4-10 FLMHNWeWa513

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

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(Pursh) Soják

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