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Saxifraga petraea; photograph author not stated, no rights reserved CC0author not stated, no rights reserved · observed growing wild · 2026-06-19

Saxifraga petraea L.

Saxifragaceae · Austria, Italy +1

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Saxifraga petraea, photograph (c) Dino Babić, some rights reserved (CC BY)Saxifraga petraea, photograph (c) Dino Babić, some rights reserved (CC BY)Saxifraga petraea, photograph (c) Dino Babić, some rights reserved (CC BY)Saxifraga petraea, photograph (c) Dino Babić, some rights reserved (CC BY)Saxifraga petraea, photograph author not stated, no rights reservedSaxifraga petraea, photograph (c) Žan Rode, some rights reserved (CC BY) 49 photographs ›
Habitat figures
Cold floor (1 night in 100)
-12.8°C
Record low -24.0 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
23°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
1,547mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
8–38DLI
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.

About the genus · Saxifraga

Saxifraga is the largest genus in the family Saxifragaceae, containing about 473 species of holarctic perennial plants, known as saxifrages or rockfoils. The Latin word saxifraga means literally "stone-breaker", from Latin saxum + frangere. It is usually thought to indicate a medicinal use for treatment of urinary calculi, rather than breaking rocks apart.

Quoted from Wikipedia, "Saxifraga", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (1,217 mm of 1,575 mm) takes 8 months, April to November. Mean temperature moves 19.9 °C between the warmest and coldest month. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: October to May.

Rain

1,575 mm in the median year at the habitat, 1,217 mm of it April to November. Wettest month September at 171 mm, driest month January at 72 mm. Across the grid cells of the range the year's total runs 1,195 mm to 2,619 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,547 mm, is the year's rain at the top of the page; the 1,575 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: 8 to 38 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 39).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -12.8 °C, the absolute minimum -24.0 °C, 5,249 frost nights in 44 years, 119.3 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 30.3 °C. Monthly means: the coldest month's mean nightly low -4.5 °C in January (across the grid cells of the range -7.5 °C to -1.9 °C), the warmest month's mean daily high 23.3 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -12.8 °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: 59 to 64% 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 +95 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 Saxifraga petraea through the yearWarmest months July and August, mean daily high 23 °C; coldest month January, mean nightly low -4.5 °C; 1,575 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.-30°-20°-10°0°10°20°30°40°frost30.3° 99th-percentile day, NASA POWER-24.0° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0100200300400mm rainDLI 8–38RH 59–64%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 51 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 °C3 / 1–55 / 2–79 / 5–1113 / 8–1517 / 13–2021 / 17–2323 / 19–2623 / 19–2619 / 15–2114 / 11–168 / 5–104 / 1–6
Night °C-5 / -8–-2-4 / -7–-1-1 / -4–23 / -1–68 / 4–1112 / 8–1414 / 11–1714 / 11–1710 / 8–136 / 4–91 / -2–4-3 / -6–0
Rain mm72 / 53–14473 / 46–11695 / 66–173140 / 102–206151 / 112–228165 / 127–231128 / 96–194146 / 110–204171 / 117–261170 / 134–310146 / 110–307118 / 80–243
DLI10 / 8–1215 / 14–1923 / 20–2629 / 27–3134 / 33–3637 / 36–3838 / 36–3933 / 31–3424 / 22–2616 / 13–1810 / 8–138 / 6–10
RH %61 / 55–6559 / 57–6360 / 58–6260 / 58–6261 / 58–6361 / 58–6360 / 57–6260 / 58–6362 / 60–6564 / 62–6663 / 60–6761 / 57–67
How this section is made
Each figure is the median across the 51 grid cells holding the 110 in-range records, 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 884:3886 (45.775, 14.325). Over 44 years there: absolute minimum -24.0 °C, 1st-percentile night -12.8 °C, 99th-percentile day 30.3 °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 51 distinct grid cells holding 110 of the 110 in-range records; extremes and elevation at the typical cell 884:3886 (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 46.00_14.375, lapse-corrected +95 m at 6.5 °C/km. Elevation: ETOPO 2022, 693 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.
NativeAustria, Italy, Yugoslavia · 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 marker46.186, 13.784 · in the densest population, 88 records (65% of those in range)
Kew's description“subshrub” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 136 georeferenced records inside the native range; the climate across the range on the 110 of them placed to within 10 km; the map shows only the 52 openly licensed ones, which alone would put the marker 11 km away. 8 records outside the WCVP native range not used. 26 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 of the 136 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Saxifraga petraea, photograph 1did not loadSaxifraga petraea, photograph 2did not loadSaxifraga petraea, photograph 3did not loadSaxifraga petraea, photograph 4did not loadSaxifraga petraea, photograph 5did not loadSaxifraga petraea, photograph 6did not load

Photographs: (c) Dino Babić, some rights reserved (CC BY) (4); author not stated, no rights reserved · CC0; (c) Žan Rode, some rights reserved (CC BY).

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

Chamaecytisus purpureus Chamaecytisus purpureus Purple Broom Photo: CC BY, Matteo MartiniSalvia saccardiana Salvia saccardiana Lamiaceae Photo: CC BY, LjažOmphalodes verna Omphalodes verna Blue-eyed-Mary Photo: CC BY, Thomas DreuxVicia oroboides Vicia oroboides Pale Vetch Photo: CC0, author not statedMedicago carstiensis Medicago carstiensis Creeping-rooted medic Photo: CC BY, LjažSilene pendula Silene pendula Nodding catchfly Photo: CC BY, David Sandler

Other Saxifraga 118 in the reference

Saxifraga adscendens Saxifraga adscendens Wedgeleaf saxifrage Photo: CC BY-SA, Emanuele SantarelliSaxifraga aizoides Saxifraga aizoides Yellow saxifrage Photo: CC BY, tetyanakuchma Saxifraga alberti Saxifragaceae Saxifraga alpigena Saxifragaceae Saxifraga andersonii Saxifraga andersonii Saxifragaceae Photo: CC BY, Sagnik Dutta RoySaxifraga androsacea Saxifraga androsacea Saxifragaceae Photo: CC BY-SA, xulescu_gSaxifraga aquatica Saxifraga aquatica Saxifragaceae Photo: CC BY, DDutreySaxifraga aretioides Saxifraga aretioides Saxifragaceae Photo: CC BY, Flavien SaboureauSaxifraga aspera Saxifraga aspera Saxifragaceae Photo: CC BY, E. BorchertSaxifraga biflora Saxifraga biflora Saxifragaceae Photo: CC BY, EliasSaxifraga brachypoda Saxifraga brachypoda Spiny-Leaf Saxifrage Photo: CC BY, Siddarth MachadoSaxifraga bronchialis Saxifraga bronchialis Spotted saxifrage Photo: CC BY, jjfeiler all 119 ›

Names & registers

Also known as Ponista petrea; Saxifraga petraea var. foliosa; Saxifraga petraea var. integrifolia; Saxifraga petraea var. littoralis; Saxifraga petrosa and 5 more. (GBIF Backbone)

Under another author Saxifraga geranioides Host is an older name of this species, not Saxifraga geranioides, a species of the reference. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataiNaturalist

The record

Family
Saxifragaceae
Described by
L.
Native to
Austria, Italy, Yugoslavia
Wild records
136 in range · 52 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
Habitat climate climate answeredasked 2026-10-22
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell 46.00_14.375, lapse-corrected +95 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-22found by its label; its IPNI identifier 794281-1 is Kew's for Saxifraga petraea L.
Wikipedia wikipedia nothing to reportasked 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 19 datasets via GBIF.org; each carries its own licence.

Cultifolio

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