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Summary
Common threesquare is a widely distributed, sharply triangular-stemmed bulrush occupying fresh to brackish shallows on multiple continents. It mirrors S. americanus in look and use but is generally shorter and often denser in patches, with heads that can be productive of small achenes. As a foraged food it contributes seed meal rather than starch-rich rhizomes. USDA Zones 4–10, with plants 30–120 cm tall and colonies spreading 0.5–2 m over time.
Physical Characteristics
Schoenoplectus pungens 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 5 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: mildly acid, 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: Cyperus pungens (Vahl) Missbach & E.H.L.Krause. Heleogiton pungens (Vahl) Rchb. Scirpus americanus var. pungens (Vahl) Barros & Osten. Scirpus pungens Vahl.
Plant Habitats
Edible Uses
Edible Uses & Rating: The achenes (seeds) are the most practical edible component. Shoots and bases are small and fibrous, contributing little caloric value. Toasted seed can be milled for porridge or flour extension. Edibility rating: 2.5/5 for seed; overall 2/5. Taste, Processing & Kitchen Notes: Seeds have a mild, cereal-like taste that improves substantially with dry toasting, which drives off any lacustrine notes. Grinding produces a pleasantly nutty meal. Combining with sweeter flours (acorn, amaranth, or wheat) balances texture and enhances binding in flatbreads. Seasonality (Phenology): Sprouting begins in spring; flowering follows late spring to early summer; seed ripening is typically summer, earlier at low elevations. Rhizomes can be lifted any time but are too slender to justify the labor. Safety & Cautions (Food Use): Harvest only in clean water systems. Dry seed thoroughly before storage to prevent molds.Harvest & Processing Workflow: Clip seedheads as they turn brown and brittle, dry in sacks with airflow, rub to release achenes, and winnow. Toast briefly, then mill. For porridge, simmer with 4–6 parts water until thick. Look-Alikes & Confusion Risks: Most often confused with S. americanus; both have triangular stems. S. pungens is typically shorter and stockier. Softstem and tule have round stems; that cross-section check is decisive. Traditional/Indigenous Use Summary: Small bulrush seeds were historically collected, parched, and ground as supplemental grains in multiple North American traditions, with vegetative material used for mats and thatch.
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
Vegetative material used for mats and thatch. Ecology & Wildlife: Provides cover for amphibians and shorebirds; seeds are taken by ducks and rails; stems support periphyton communities that fuel aquatic food webs.
Special Uses
References More on Other Uses
Cultivation details
Identification & Habit: A perennial sedge with distinctly three-angled stems and reduced leaf blades. Inflorescences are at or near the stem apex, appearing as compact clusters of brown spikelets subtended by a bract. Rhizomes are fine and creeping but not thick. Compared to softstem or tule, the plant is shorter and crisper, and the triangular stem is diagnostic in the hand. It is a helophyte (a plant that naturally thrives in salty environments, such as salt marshes, mangrove swamps, and saline deserts) and grows primarily in the temperate biome. Growing Conditions: Prefers full sun, shallow water to saturated soils, and tolerates low to moderate salinity. Performs in loams and mucks with good organic content. Habitat & Range: Widespread in North America, Europe, Asia, and parts of Africa and Australasia, especially in pond margins, marshes, and slow creeks. In the Southwest it is frequent in valley bottoms and irrigation ditches where water is relatively fresh. Size & Landscape Performance: Lower stature than tule makes it useful for foreground wetland bands, bioswales, and shorelines where sightlines matter. It forms neat, geometric clumps that resist lodging. Cultivation (Horticulture): Easy to establish by planting rooted divisions into saturated edges at 5–15 cm water depth. Maintain open water around clumps to limit competition and facilitate seed maturation. Pests & Problems: Usually trouble-free. Over-shading reduces vigor; extreme eutrophication can encourage algal smothering of seedlings. Cultivar/Selection Notes: No named varieties; notable variation exists in clump density and phenology. Local ecotypes are best for restoration fidelity. Morphologically and ecologically aligned with S. americanus. Wind-pollinated, with some selfing; insects negligible.
References Carbon Farming Information and Carbon Sequestration Information
Temperature Converter
Type a value in the Celsius field to convert the value to Fahrenheit:
Fahrenheit:
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Plant Propagation
Divide crowns in early spring, or sow cold-stratified seed on saturated media. Light speeds germination; do not bury seed deeply.
Other Names
If available other names are mentioned here
Common threesquare (S. pungens), Common three square
Native Range
US. USA. Alabama, Alberta, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Austria, Bolivia, British Columbia, California, Chatham Is., Chile Central, Chile North, Colorado, Connecticut, Delaware, District of Columbia, Dominican Republic, Florida, France, Georgia, Germany, Great Britain, Hungary, Idaho, Illinois, Indiana, Iowa, Italy, Kansas, Kentucky, Louisiana, Maine, Manitoba, Maryland, Massachusetts, Mexico Northeast, Mexico Northwest, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Netherlands, Nevada, New Hampshire, New Jersey, New Mexico, New South Wales, New York, New Zealand North, New Zealand South, Newfoundland, North Carolina, North Dakota, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Peru, Poland, Portugal, Québec, Rhode I., South Australia, South Carolina, Spain, Switzerland, Tasmania, Tennessee, Texas, Ukraine, Uruguay, Utah, Vermont, Victoria, Virginia, Washington, West Virginia, Western Australia, Wisconsin, Wyoming
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 to moderate. It expands by short rhizomes and seed but rarely becomes a monoculture in diverse wetlands.
Conservation Status
IUCN Red List of Threatened Plants Status : Not available
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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Expert comment
Author
(Vahl) Palla
Botanical References
Links / References
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Subject : Schoenoplectus pungens
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