Bigleaf hydrangea

ஹைட்ராஞ்ஜியா மேக்ரோபைலாഹൈഡ്രാഞ്ചിയহাইড্রাঞ্জিয়া

Hydrangea macrophylla (Thunb.) Ser.

light
Part sun
water
Medium
tall
1.7 m
wide
1.7 m

Hydrangeaceae

Also called Mophead hydrangea, French hydrangea, Common hydrangea, Bigleaf Hydrangea, Hydrangea

Formerly Hortensia japonica, Hortensia macrophylla, Hortensia mutabilis, Hortensia nigra, and 18 more

When it flowers

Flowers October to January in the tropics.

Read from iNaturalist photographs of it in flower. A month counts at 50% of the best month's flowering share (smoothed over three months) and 10% of its flowering count, from at least 100 flowering observations in the band.

PetsNC State Extension lists it as toxic to dogs, cats and horses (25 Oct 2026)
PeopleNC State Extension lists it as mildly poisonous (bark, flowers, leaves) (25 Oct 2026)

If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.

Something wrong with it?

About it

Grows as
ShrubKew's checklist, not yet checked
Climate
TemperateKew's checklist, not yet checked
Wild in
SC. Japan (to Izu Ōshima), Kazan RettōKew's checklist, not yet checked
Light
Part shade (3 to 6 h)Read from NC State Extension and RHS, checked by a majority of its sourcesBacked by both sources. Sources differ: NC State Extension part, shade; RHS full, part
Height
1.5 m to 1.8 mRead from NC State Extension and RHS, checked by a majority of its sourcesBacked by both sources. Sources differ: NC State Extension 3–6 ft; RHS 1.5–2.5 m
Spread
1.5 m to 1.8 mRead from NC State Extension and RHS, checked by a majority of its sourcesBacked by both sources. Sources differ: NC State Extension 3–6 ft; RHS 1.5–2.5 m
Water
Average: moist, well drainedRead from NC State Extension and RHS, checked by a majority of its sourcesBacked by both sources
Flowers
Pink, blueRead from NC State Extension and RHS, checked by a majority of its sourcesBacked by both sources. Sources differ: NC State Extension blue, pink, purple, white; RHS blue, pink
Coldest it survives
-19.1 °C (USDA zone 6b)Read from NC State Extension and RHS, checked: the middle of what its sources sayHalfway between its 2 sources, which differ. Sources differ: NC State Extension -23.3 °C; RHS -15 °C

Not known yet: heat, hottest it survives.

Grow it with

Suggested by a rule, not by a gardener: same climate (kew), flowering when this plant does not (inaturalist), and a different shape.

In other languages (12)

Hawaiian
pōpōhau
Spanish
Hortensia japonesa
Portuguese
Hidrângea, Hortênsia, Hortense
French
Hortensia
Chinese
繡球花
Czech
hortenzie velkolistá
Dutch
hortensia, Boerenhortensia, Grote hortensia
Estonian
suurelehine hortensia
Norwegian Bokmål
hortensia
German
Gartenhortensie
Japanese
アジサイ, 紫陽花
Finnish
jalohortensia

Where this comes from

A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.