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Artemisia biennis; photograph author not stated, no rights reserved CC0author not stated, no rights reserved · observed growing wild · 2025-09-24

Artemisia biennis Willd.

Biennial wormwood; Slender mugwort; Biennial sagewort

Asteraceae · Alaska, Northwest Territories +14

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Artemisia biennis, photograph author not stated, no rights reservedArtemisia biennis, photograph author not stated, no rights reservedArtemisia biennis, photograph author not stated, no rights reservedArtemisia biennis, photograph (c) Jes Gray, some rights reserved (CC BY)Artemisia biennis, photograph author not stated, no rights reservedArtemisia biennis, photograph author not stated, no rights reserved 76 photographs ›
Habitat figures
Cold floor (1 night in 100)
-26.3°C
Record low -40.4 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
26°C
Jul at the habitat CHELSA
Rain a year (median across the range)
436mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
14–50DLI
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

Artemisia biennis is a species of sagebrush known by the common name biennial wormwood. It is a common and widely distributed weed, so well established in many places that its region of origin is difficult to ascertain. This species is most likely native to northwestern North America (British Columbia, Washington, and Oregon) and naturalized in Western Europe, and eastern and southern North America.

Quoted from Wikipedia, "Artemisia biennis", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (269 mm of 383 mm) takes 8 months, November to January, March and May to August. Mean temperature moves 23.0 °C between the warmest and coldest month. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: November to February, May to July and September.

Rain

383 mm in the median year at the habitat, 269 mm of it November to January, March and May to August. Wettest month May at 38 mm, driest month February at 26 mm. Across the grid cells of the range the year's total runs 283 mm to 612 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 436 mm, is the year's rain at the top of the page; the 383 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: 14 to 50 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 5, 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 -26.3 °C, the absolute minimum -40.4 °C, 7,273 frost nights in 44 years, 165.3 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 33.9 °C. Monthly means: the coldest month's mean nightly low -8.5 °C in January (across the grid cells of the range -15.6 °C to 8.1 °C), the warmest month's mean daily high 26.0 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -26.3 °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: 50 to 60% 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 -145 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 Artemisia biennis through the yearWarmest month July, mean daily high 26 °C; coldest month January, mean nightly low -8.5 °C; 383 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.-60°-40°-20°0°20°40°frost33.9° 99th-percentile day, NASA POWER-40.4° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125mm rainDLI 14–50RH 50–60%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 125 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 °C2 / -6–153 / -3–168 / 2–1713 / 7–1818 / 14–2222 / 18–2726 / 21–3225 / 21–3122 / 17–2616 / 9–227 / 0–182 / -6–15
Night °C-9 / -16–8-7 / -13–9-4 / -10–101 / -5–106 / 1–1211 / 6–1413 / 10–1713 / 9–179 / 5–154 / -1–14-3 / -10–11-8 / -15–8
Rain mm31 / 12–10326 / 11–10134 / 17–8230 / 20–6138 / 10–7533 / 2–8133 / 1–7732 / 1–7231 / 5–5327 / 16–5132 / 14–6136 / 13–93
DLI16 / 7–2023 / 13–2732 / 23–3640 / 33–4546 / 39–5050 / 41–5349 / 40–5243 / 34–4735 / 25–3926 / 15–3017 / 8–2314 / 5–19
RH %60 / 52–6659 / 52–6457 / 51–6353 / 49–6152 / 45–6152 / 42–6250 / 40–6351 / 41–6351 / 44–6353 / 47–6357 / 51–6459 / 52–66
How this section is made
Each figure is the median across the 125 grid cells on land that hold in-range records (134 records in those cells; 1 more cell holds records but no land by the elevation layer, so those records sit at sea and the cell is 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 806:1342 (49.675, -112.875). Over 44 years there: absolute minimum -40.4 °C, 1st-percentile night -26.3 °C, 99th-percentile day 33.9 °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 125 distinct grid cells holding 134 of the 135 in-range records (1 further cell with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 806:1342 (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 49.50_-113.125, lapse-corrected -145 m at 6.5 °C/km. Elevation: ETOPO 2022, 909 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.
NativeAlaska, Northwest Territories, Yukon, Alberta, British Columbia, Colorado, Idaho, Montana, Oregon, Washington, Wyoming, Arizona, California, Nevada, Utah, New Mexico · introduced: Denmark, Finland, Great Britain, Ireland, Norway, Belgium, Czechoslovakia, Germany, Netherlands, Poland, Switzerland, France, Italy, Manitoba, Saskatchewan, New Brunswick, Nova Scotia, Ontario, Prince Edward I., Québec, Illinois, Iowa, Kansas, Minnesota, Missouri, North Dakota, Nebraska, South Dakota, Wisconsin, Connecticut, Indiana, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode I., Vermont, West Virginia, Delaware, Kentucky · 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 marker34.139, -119.183 · in the densest population, 98 records (44% of those in range)
Kew's description“annual or biennial” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 221 georeferenced records inside the native range; the climate across the range on the 134 of them in the land cells it reads, of 135 placed to within 10 km; the map shows only the 112 openly licensed ones, which alone would put the marker 1085 km away. 814 records outside the WCVP native range not used. 86 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 221 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Artemisia biennis, photograph 1did not loadArtemisia biennis, photograph 2did not loadArtemisia biennis, photograph 3did not loadArtemisia biennis, photograph 4did not loadArtemisia biennis, photograph 5did not loadArtemisia biennis, photograph 6did not load

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

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

Orobanche fasciculata Orobanche fasciculata Orobanchaceae Photo: CC BY-SA, Stan ShebsRosa woodsii Rosa woodsii Woods' rose Photo: CC0, author not statedPoa fendleriana Poa fendleriana Mutton bluegrass Photo: CC BY, Hank RaizenPseudoroegneria spicata Pseudoroegneria spicata Bluebunch wheatgrass Photo: CC0, author not statedDieteria canescens Dieteria canescens Hoary aster Photo: CC0, author not statedHeuchera rubescens Heuchera rubescens Jack-o'the-rocks Photo: CC BY, Trevor Van Loon

Other Artemisia 86 in the reference

Artemisia abrotanum Artemisia abrotanum Southernwood Photo: CC BY, Мирослав СоболевArtemisia absinthium Artemisia absinthium Wormwood Photo: CC BY-SA, Serdar ÖlezArtemisia adamsii Artemisia adamsii Asteraceae Photo: CC BY, Urgamal MagsarArtemisia afra Artemisia afra African wormwood Photo: CC BY-SA, Tony RebeloArtemisia alba Artemisia alba White Mugwort Photo: CC BY, Matteo MartiniArtemisia alpina Artemisia alpina Asteraceae Photo: CC BY, Илья РуденкоArtemisia annua Artemisia annua Sweet wormwood Photo: CC BY-SA, Josep GestiArtemisia anomala Artemisia anomala Asteraceae Photo: CC BY, 鄭雪雲Artemisia arborescens Artemisia arborescens Hedge artemisia Photo: CC BY, Anis DrisArtemisia arbuscula Artemisia arbuscula Sagebrush Photo: CC BY, James H. ThomasArtemisia argentea Artemisia argentea Madeira wormwood Photo: CC BY, Vítor JorgeArtemisia argyi Artemisia argyi Chinese mugwort Photo: CC BY, Repina Tatyana all 87 ›

Names & registers

Also known as Artemisia biennis var. biennis; Artemisia biennis var. diffusa; Artemisia hispanica; Artemisia inconspicua; Artemisia jacquinii and 1 more. (GBIF Backbone)

Under another author Artemisia australis Ehrh. and Artemisia australis Ehrh. ex DC. is an older name of this species, not Artemisia australis, a species of the reference. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Asteraceae
Described by
Willd.
Native to
Alaska, Northwest Territories, Yukon +13
Wild records
221 in range · 112 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 2026-10-21
GBIF species record gbif.species answeredasked 2026-10-21
GBIF synonyms gbif.synonyms answeredasked 2026-10-21
GBIF common names gbif.vernacular answeredasked 2026-10-21names fetched 2026-10-21
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 (14 at a botanic garden or arboretum, 1 at a herbarium, 6 at a zoo; Wikidata's list)
Habitat climate climate answeredasked 2026-10-21
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-21NASA POWER (MERRA-2) daily 1981–2024, cell 49.50_-113.125, lapse-corrected -145 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-21
Wikipedia wikipedia answeredasked 2026-10-21
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 2026-10-21
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 137 datasets via GBIF.org; each carries its own licence.

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