Hydrangea Care Guide Indoors and Out
Climate DNA for bigleaf hydrangea Hydrangea care varies by species. This evidence module is specifically for Hydrangea macrophylla, the bigleaf hydrangea behind many blue and pink mophead forms. The ranges below are the middle 50% (p25–p75), not recommended indoor setpoints. Reference taxon POWO native range Annual mean temperature Annual precipitation Relative humidity Solar radiation Evidence Hydrangea macrophylla (bigleaf hydrangea) south-central Japan to Izu Oshima and the Kazan Islands 15.1–16.7°C 1445–1935 mm/yr 60–61% 13.7–14.6 MJ/m²/day 30 climate points / 255 usable records; medium confidence What this changes in this guide: Unlike the tropical houseplant profiles elsewhere on the site, this temperate native envelope gives seasonal outdoor context; pot moisture, cultivar, pruning group, and local frost exposure still remain separate decisions. ...