Hydrangea arborescens L.
Smooth Hydrangea, Smooth hydrangea, Wild hydrangea, Sevenbark, Sheep flower, Wild hydrangea, migugsugug
Every figure on this page is derived from public data by a stated rule and says its source; nothing here is written by a person or a model, except the Wikipedia passage, which is quoted and marked as such. How it is made.
Summary
Hydrangea arborescens, commonly known as smooth hydrangea or sevenbark, is a species of flowering plant in the family Hydrangeaceae. It is a small- to medium-sized, multi-stemmed, deciduous shrub up to 2 m (7 ft) tall that is native to the eastern United States.
Text from Wikipedia, “Hydrangea arborescens”, CC BY-SA 4.0, quoted as written. Kept separate from everything derived here.
About the genus · Hydrangea
Hydrangea is a genus of more than 70 species of flowering plants native to Asia and the Americas. Hydrangea is also used as the common name for the genus; some are also often called hortensia. The genus was first described from Virginia in North America, but by far the greatest species diversity is in eastern Asia, notably China, Korea, and Japan. More on Wikipedia ›
The opening of Wikipedia, “Hydrangea”, CC BY-SA 4.0, quoted as written.
At a glance
Also known as Hydrangea acuta Raf.; Hydrangea amplifolia Raf.; Hydrangea arborescens Torrey & A.Gray; Hydrangea arborescens f. acarpa H.St.John; Hydrangea arborescens f. arborescens and 31 more.
Cultivation
Grouped as a temperate garden plant by the genus Hydrangea, which is reliably one kind of plant (archetype table). The table holds no figure for this group, which spans too much for one minimum; the cold floor is the habitat's alone, and no prose comes from the table.
Its year Rain rule: no season, 70% of the rain takes 8 months (March to September and November in the northern hemisphere).
This species’ habitat figures, and what two fixed rules read from them.
The rain rule reads no season: 70% of the year's rain (856 mm of 1205 mm) takes 8 months, March to September and November. Mean temperature moves 23.9 °C between the warmest and coldest month. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: September to March and May.
Read from the median year of CHELSA monthly rainfall and mean temperature across the envelope cells: 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 gives a season to reverse. A reading of the curves, not an observation of the plant.
Rain Habitat rain 1205 mm a year, wettest May at 120 mm, driest February at 80 mm (habitat calendar, northern hemisphere).
This species’ habitat figures, with their source.
1205 mm a year at the habitat, 856 mm of it March to September and November. Wettest month May at 120 mm, driest February at 80 mm. Across the envelope cells the year's total runs 1030 mm to 1531 mm (10th to 90th percentile of each cell's own year) (median year across the envelope cells, CHELSA; habitat calendar, northern hemisphere).
CHELSA monthly precipitation, median year across the envelope cells. The rain that falls where the species is recorded; nothing about how the plant takes water.
Light Open sky over the habitat: 12 to 39 mol/m²/day.
This species’ habitat figures, with their source.
Open sky over the habitat: 12 to 39 mol/m²/day across the year (daily light integral, median year across the envelope cells, CHELSA; the lowest 10th-percentile month across the cells is 10, the highest 90th-percentile month 41).
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.
Warmth and air Cold floor -14.8 °C (1st-percentile habitat night, NASA POWER).
This species’ habitat figures, with their source.
Coldest: the 1st-percentile night over 44 years at the typical cell is -14.8 °C, the absolute minimum -26.5 °C, about 122 frost nights a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 33.2 °C. Monthly means: coldest night -3.9 °C in January (across the envelope cells -7.5 °C to 0.4 °C), warmest day 28.7 °C in July (median year across the envelope cells, CHELSA). Cold floor: -14.8 °C, which is the 1st-percentile night over 44 years at the typical cell (NASA POWER).
NASA POWER daily minima and maxima 1981–2024 at the typical cell, lapse-corrected to its elevation; CHELSA monthly means, median year across the envelope cells, CHELSA. The cold floor is the figure named in its sentence. Not a measured survival limit for any plant in a pot.
Relative humidity at the habitat: 56 to 60% across the year (monthly means, median year across the envelope cells, CHELSA). A figure about the air, saying nothing about how the plant takes water.
CHELSA relative humidity, median year across the envelope cells.
The figures the cards read from are in Climate below, and where they came from in Natural habitat.
Climate across the habitat
Figures by month
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day °C | 5 / 0–9 | 7 / 2–12 | 12 / 8–16 | 18 / 14–21 | 22 / 19–25 | 27 / 23–29 | 29 / 26–31 | 28 / 25–31 | 24 / 21–27 | 18 / 15–22 | 12 / 9–16 | 6 / 2–10 |
| Night °C | -4 / -8–0 | -3 / -6–2 | 1 / -2–6 | 7 / 3–10 | 12 / 9–15 | 17 / 14–20 | 19 / 16–22 | 19 / 16–21 | 15 / 12–18 | 9 / 6–12 | 4 / 1–7 | -2 / -5–2 |
| Rain mm | 84 / 63–138 | 80 / 60–146 | 102 / 78–141 | 105 / 88–128 | 120 / 100–148 | 114 / 100–140 | 118 / 101–148 | 100 / 83–126 | 99 / 81–124 | 90 / 73–112 | 98 / 80–126 | 95 / 74–144 |
| DLI | 14 / 12–17 | 20 / 18–21 | 27 / 25–28 | 33 / 32–36 | 37 / 36–39 | 39 / 38–41 | 38 / 37–41 | 34 / 33–37 | 29 / 26–31 | 22 / 19–24 | 15 / 13–18 | 12 / 10–15 |
| RH % | 59 / 57–62 | 57 / 56–60 | 56 / 55–58 | 56 / 55–57 | 58 / 56–60 | 59 / 57–62 | 59 / 58–62 | 60 / 58–63 | 59 / 57–62 | 58 / 56–60 | 58 / 57–60 | 59 / 57–62 |
Each figure is the median across the 1265 grid cells holding the 1694 in-range records, with the 10th–90th percentile span across those cells after the slash where it differs. Extremes and elevation were read at the typical cell 1053:1988 (37.325, -80.575). Over 44 years there: absolute minimum -26.5 °C, 1st-percentile night -14.8 °C, 99th-percentile day 33.2 °C. Normals: CHELSA V2.1 1981–2010 climatology, 0.05° cells (each the mean of ~36 1 km pixels). Envelope: median and 10th–90th percentile of each month across the 1265 distinct grid cells holding the 1694 in-range records; extremes and elevation at the typical cell 1053:1988 (its coldest month's mean night nearest the median across cells); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell 37.50_-80.625, lapse-corrected +32 m at 6.5 °C/km. Elevation: ETOPO 2022, 712 m (cell mean).
Natural habitat
Photographs
Photographs: (c) Andrew Conboy, some rights reserved (CC BY) (3); (c) Brandon Corder, some rights reserved (CC BY); (c) Mark Eanes, some rights reserved (CC BY); (c) Jacqueline Raiford, some rights reserved (CC BY) (2); (c) Natalie Lemanski, some rights reserved (CC BY-SA).
Photographs: iNaturalist did not answer when this page was built; what is shown came from the sources that did.
Papers naming this species
Works whose title or abstract names Hydrangea arborescens, most cited first, from OpenAlex (CC0). A mention, not a cultivation source: nothing on this page is drawn from them.
Related
Similar habitat climate the 6 species whose habitat climate is nearest this one's: mean day and night, month by month, and rain on a log scale, in calendar order, so a habitat with the same seasons six months out is far, not near. Nothing else counts: not range, not family.
Thalictrum thalictroides rue anemone
Sedum ternatum whorled stonecrop
Polygonatum biflorum American Solomon's-seal
Verbesina alternifolia Wing Stem, Yellow Iron Weed
Viburnum prunifolium Black Haw
Jeffersonia diphylla ManchuriaOther Hydrangea 5 in the reference
Hydrangea macrophylla Bigleaf Hydrangea
Hydrangea paniculata Panicle Hydrangea
Hydrangea petiolaris Climbing hydrangea
Hydrangea quercifolia oak-leaf hydrangea
Hydrangea serrata Mountain Hydrangea History & registers
Where this page came from built 2026-09-20 · dossier v2 · node
gbif.species answeredcarried from build of 2026-09-19 (offline re-derivation; the backbone was not asked)gbif.synonyms answeredcarried from build of 2026-09-19 (offline re-derivation; the backbone was not asked)gbif.vernacular answeredcarried from build of 2026-09-19 (offline re-derivation; the backbone was not asked)wcvp.distribution answeredgbif.occurrences answeredGBIF occurrence download https://doi.org/10.15468/dl.3h4zamclimate answeredwikidata answeredcarried from build of 2026-09-19 (rederive); that build: carried from build of 2026-09-19 (rederive)wikipedia answeredcarried from build of 2026-09-19; this build: skippedinat.taxon not askedinat.photos.wild answeredcarried from build of 2026-09-19; this build: skippedinat.photos.cultivated nothing to reportcarried from build of 2026-09-19 (rederive); that build: carried from build of 2026-09-19 (rederive)commons nothing to reportcarried from build of 2026-09-19 (rederive); that build: carried from build of 2026-09-19 (rederive)gbif.media answeredopenalex answeredcarried from build of 2026-09-19; this build: skippedEvery upstream is recorded as having answered, reported nothing, or refused. Only “nothing to report” is ever shown as an absence. Records came from 94 datasets via GBIF.org; each carries its own licence.