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An example collection, so you can see what this page does. Nothing added here is kept: leaving deletes it.
Schoenoplectus acutus; photograph (c) Katie Kucera, some rights reserved (CC BY) CC BY(c) Katie Kucera, some rights reserved (CC BY) · observed growing wild · 2026-08-29

Schoenoplectus acutus (Muhl. ex Bigelow) Á.Löve & D.Löve

Hardstem bulrush; Hard-stemmed bulrush; Common tule; Tule

Cyperaceae · Kamchatka, Alaska +56

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Schoenoplectus acutus, photograph author not stated, no rights reservedSchoenoplectus acutus, photograph author not stated, no rights reservedSchoenoplectus acutus, photograph author not stated, no rights reservedSchoenoplectus acutus, photograph author not stated, no rights reservedSchoenoplectus acutus, photograph author not stated, no rights reservedSchoenoplectus acutus, photograph (c) Daughter Dad, some rights reserved (CC BY) 94 photographs ›
Habitat figures
Cold floor (1 night in 100)
-18.4°C
Record low -28.8 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
27°C
Jul at the habitat CHELSA
Rain a year (median across the range)
670mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
10–44DLI
Lowest to highest month (DLI) CHELSA
The year in your months, northern hemisphere
  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec
Rain spread: 70% of the median year's rain takes 8 months, so no short rainy season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Schoenoplectus acutus (syn. Scirpus acutus, Schoenoplectus lacustris, Scirpus lacustris subsp. acutus), called tule , common tule, hardstem tule, tule rush, hardstem bulrush, or viscid bulrush, is a giant species of sedge in the plant family Cyperaceae, native to freshwater marshes all over North America. The common name derives from the Nāhuatl word tōllin [ˈtoːlːin], and it was first recognized by the early Spanish explorers and missionaries in New Spain who saw the marsh plants in the Central Valley of California as similar to those in the marshes around Mexico City being used to construct shelters by the indigenous inhabitants.

Quoted from Wikipedia, "Schoenoplectus acutus", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (455 mm of 631 mm) takes 8 months, March to October. Mean temperature moves 25.2 °C between the warmest and coldest month. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: September to April.

Rain

631 mm in the median year at the habitat, 455 mm of it March to October. Wettest month June at 71 mm, driest month February at 40 mm. Across the grid cells of the range the year's total runs 303 mm to 1,118 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 670 mm, is the year's rain at the top of the page; the 631 mm here is the median year's, the twelve monthly medians added, which the rain rule reads. Habitat calendar, northern hemisphere; median year across the grid cells of the range, CHELSA.

Light

Open sky over the habitat: 10 to 44 mol/m²/day across the year (daily light integral, median year across the grid cells of the range, CHELSA; the lowest 10th-percentile month across the cells is 6, the highest 90th-percentile month 53).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -18.4 °C, the absolute minimum -28.8 °C, 6,079 frost nights in 44 years, 138.2 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 32.9 °C. Monthly means: the coldest month's mean nightly low -7.7 °C in January (across the grid cells of the range -15.5 °C to 4.5 °C), the warmest month's mean daily high 27.0 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -18.4 °C, which is the 1st-percentile night over 44 years at a typical spot in the range (NASA POWER).

Humidity

Relative humidity at the habitat: 55 to 62% across the year (monthly means, median year across the grid cells of the range, CHELSA). A figure about the air, saying nothing about how the plant takes water.

How this section is made

Each card states this species' habitat figures with their sources, and what two fixed rules read from them; nothing here says what the plant does, wants or tolerates. The rules · the terms.

Seasons. Read from the median year of CHELSA monthly rainfall and mean temperature across the grid cells of the range: the rain rule takes the smallest set of months carrying 70% of the rain and calls it winter when its mean is more than half a degree below the year's, summer when more than that above, and neither in between; the temperature rule, used only under 120 mm, names the cooler six months when they are at least a degree cooler than the other six. Months are shifted for the other hemisphere only where the temperature curve moves 4 °C or more and the habitat lies 10° or more from the equator. A reading of the curves, not an observation of the plant.

Rain. CHELSA monthly precipitation, median year across the grid cells of the range. The rain that falls where the species is recorded; nothing about how the plant takes water.

Light. CHELSA shortwave radiation at each envelope cell, a daily-mean flux taken to a daily total and converted at 2.07 mol of PAR per MJ. The sky over the habitat, measured; what reaches a plant under a rock, a shrub or a shade cloth is not.

Temperature. NASA POWER daily minima and maxima over 44 years at a typical spot in the range, lapse-corrected +13 m to its elevation; CHELSA monthly means, median year across the grid cells of the range. The cold floor is the 1st-percentile night named in its sentence. Not a measured survival limit for any plant in a pot.

Humidity. CHELSA relative humidity, median year across the grid cells of the range.

Climate across the habitat

Habitat months, northern hemisphere

Habitat climate of Schoenoplectus acutus through the yearWarmest month July, mean daily high 27 °C; coldest month January, mean nightly low -7.7 °C; 631 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA; the extremes at the edge from NASA POWER. Habitat months, northern hemisphere.-40°-20°0°20°40°frost32.9° 99th-percentile day, NASA POWER-28.8° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125150mm rainDLI 10–44RH 55–62%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 1000 habitat cells, CHELSA cold quarter: the three months around the coldest month's mean nightly low extremes over 44 years at a typical spot in the range, from NASA POWER, marked at the edge, in no month DLI, mol/m²/dayRH %each on its own scale
Figures by month
JanFebMarAprMayJunJulAugSepOctNovDec
Day °C1 / -7–143 / -5–168 / 1–1814 / 8–2219 / 14–2624 / 19–3127 / 22–3326 / 22–3222 / 18–2915 / 10–248 / 2–182 / -5–14
Night °C-8 / -16–5-7 / -13–6-3 / -8–72 / -2–98 / 4–1313 / 9–1717 / 12–2016 / 12–1912 / 8–166 / 1–120 / -5–8-6 / -13–5
Rain mm43 / 15–12140 / 13–10547 / 20–9751 / 20–9165 / 12–10171 / 4–11564 / 2–10658 / 3–10349 / 9–10250 / 19–10647 / 17–11746 / 16–129
DLI12 / 8–2119 / 15–2827 / 24–3735 / 31–4640 / 36–5143 / 38–5344 / 38–5238 / 33–4729 / 24–3919 / 15–3112 / 8–2310 / 6–19
RH %62 / 52–6760 / 52–6557 / 50–6255 / 46–6055 / 45–6056 / 42–6157 / 43–6157 / 44–6157 / 45–6157 / 47–6260 / 49–6462 / 51–67
How this section is made
Each figure is the median across the 1000 grid cells on land that hold in-range records (1138 records in those cells; 2 more cells hold records but no land by the elevation layer, so those records sit at sea and the cells are left out), with the 10th–90th percentile span across those cells after the slash where it differs. A dash is a month one or more of those cells has no figure for in the grid (a variable CHELSA does not carry there), so no median is taken rather than one over fewer cells. Extremes and elevation were read at a typical spot in the range, cell 960:1921 (41.975, -83.925). Over 44 years there: absolute minimum -28.8 °C, 1st-percentile night -18.4 °C, 99th-percentile day 32.9 °C. Normals: CHELSA V2.1 1981–2010 climatology, 0.05° cells (each the mean of ~36 1 km pixels). Across the range: median and 10th–90th percentile of each month across the 1000 distinct grid cells holding 1138 of the 1140 in-range records (2 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 960:1921 (its coldest month's mean nightly low nearest the median across cells); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell 42.00_-83.750, lapse-corrected +13 m at 6.5 °C/km. Elevation: ETOPO 2022, 239 m (cell mean).

Natural habitat

Native range as published by WCVP; the marker is where the records are densest and decides nothing: the climate was read across the cells of the in-range records placed well enough to read one, not at the marker.
Openly licensed records inside the range, framed on where they fall.
NativeKamchatka, Alaska, Northwest Territories, Yukon, Alberta, British Columbia, Manitoba, Saskatchewan, New Brunswick, Newfoundland, Nova Scotia, Ontario, Prince Edward I., Québec, Colorado, Idaho, Montana, Oregon, Washington, Wyoming, Illinois, Iowa, Kansas, Minnesota, Missouri, North Dakota, Nebraska, Oklahoma, South Dakota, Wisconsin, Connecticut, Indiana, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode I., Vermont, West Virginia, Arizona, California, Nevada, Utah, New Mexico, Texas, Alabama, Arkansas, Delaware, Kentucky, Maryland, North Carolina, Virginia, Mexico Northwest, C. American Pacific Is. · regions are the level-3 units of the World Geographical Scheme for Recording Plant Distributions, as Kew's World Checklist records ranges, some under historical names such as Yugoslavia or Czechoslovakia (how).
Map marker33.924, -117.599 · in the densest population, 445 records (24% of those in range)
Kew's description“perennial or rhizomatous geophyte” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 1831 georeferenced records inside the native range; the climate across the range on the 1138 of them in the land cells it reads, of 1140 placed to within 10 km; the map shows only the 887 openly licensed ones, which alone would put the marker 543 km away. 24 records outside the WCVP native range not used. 691 in-range records are placed to worse than 10 km, or with no stated accuracy (admitted only as a person's observation to three decimals), and stay on the map but off the climate.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population inside the densest 4° block of the 1831 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Schoenoplectus acutus, photograph 1did not loadSchoenoplectus acutus, photograph 2did not loadSchoenoplectus acutus, photograph 3did not loadSchoenoplectus acutus, photograph 4did not loadSchoenoplectus acutus, photograph 5did not loadSchoenoplectus acutus, photograph 6did not load

Photographs: author not stated, no rights reserved · CC0 (5); (c) Daughter Dad, some rights reserved (CC BY).

Similar habitat climate The 6 nearest by mean daily high, mean nightly low and rain, month by month. How.

Comandra umbellata Comandra umbellata Bastard toadflax Photo: CC BY, rosaceae_robertsVeronica multifida Veronica multifida Narrow-Leaved Speedwell Photo: CC0, author not statedUrtica gracilis Urtica gracilis Slender nettle Photo: CC BY, Arthur WhitingCarex pellita Carex pellita Woolly sedge Photo: CC BY-SA, AlexSalix amygdaloides Salix amygdaloides Peach-leaf willow Photo: CC0, author not statedLepidium densiflorum Lepidium densiflorum Miner's pepperwort Photo: CC BY, Евгений Маринкин

Other Schoenoplectus 6 in the reference

Schoenoplectus americanus Schoenoplectus americanus Chairmaker's bulrush Photo: CC BY, Daughter DadSchoenoplectus californicus Schoenoplectus californicus California bulrush Photo: CC BY, Rocío Esmeralda PoseSchoenoplectus lacustris Schoenoplectus lacustris Common club-rush Photo: CC BY, Мирослав СоболевSchoenoplectus pungens Schoenoplectus pungens Sharp club-rush Photo: CC BY, Dustin SniderSchoenoplectus tabernaemontani Schoenoplectus tabernaemontani Grey club-rush Photo: CC BY, Flavien SaboureauSchoenoplectus triqueter Schoenoplectus triqueter Triangular club-rush Photo: CC BY, ITÔ, Hiroki

Names & registers

Also known as Schoenoplectus lacustris subsp. acutus; Scirpus acutus; Scirpus lacustris subsp. acutus. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Cyperaceae
Described by
(Muhl. ex Bigelow) Á.Löve & D.Löve
Native to
Kamchatka, Alaska, Northwest Territories +55
Wild records
1831 in range · 887 open

Every figure here is derived from public data by a stated rule and names its source; nothing about this species is written for its page by a person or by AI, apart from the marked, credited quotations. How →

Where this page came from built 2026-10-22
GBIF species record gbif.species answeredasked 2026-10-22
GBIF synonyms gbif.synonyms answeredasked 2026-10-22
GBIF common names gbif.vernacular answeredasked 2026-10-22names fetched 2026-10-22
WCVP native range wcvp.distribution answeredas of 2026-06-04
GBIF occurrence records gbif.occurrences answeredas of 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 21 records within 1 km of a botanic garden, herbarium or zoo left out (11 at a botanic garden or arboretum, 10 at a zoo; Wikidata's list)
Habitat climate climate answeredasked 2026-10-22
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell 42.00_-83.750, lapse-corrected +13 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-22IPNI and POWO linked by Kew's number for Schoenoplectus acutus (Muhl. ex Bigelow) Á.Löve & D.Löve (the item's: IPNI 1176680-2, POWO 229809-2)
Wikipedia wikipedia answeredasked 2026-10-22
iNaturalist photographs, wild inat.photos.wild answeredasked 2026-10-22from iNaturalist's open data of 2026-09-27: research-grade observations with an open-licence photograph, the 24 whose photographs iNaturalist received last (the open data holds no votes); filled 2026-10-22
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.media answeredasked 2026-10-22
OpenAlex papers openalex not askednot yet asked for this reference; a later fill takes the papers from OpenAlex's snapshot

Every source is recorded as having answered, reported nothing, refused, failed, not been asked, or answered twice where one answer is taken (“not taken: two items answered”), and, for a source asked when this page was built, when: the figures are as the source held them that day; a source read from a file (Kew's World Checklist, a GBIF download) says "as of" the file's day instead; a row carried from an earlier build of the page names that build instead. Only “nothing to report” is ever shown as an absence. Records came from 129 datasets via GBIF.org; each carries its own licence.

Cultifolio

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