Hydrangea: colours, meaning, where it grows and when it blooms

Hydrangea is a group of over 70 flowering plant species found in Asia and the Americas. These shrubs are grown mainly for their large, colorful flower clusters, which can shift between blue, pink, and purple depending on soil acidity. Hydrangeas are widely used in gardens and have cultural roles in Japan and Korea.

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Hydrangea flowers can turn blue or pink depending on soil acidity.
Hydrangea macrophylla has over 600 named varieties.
In Japan, hydrangea leaves are used to make sweet tea for Buddha's birthday.
All parts of the hydrangea plant are toxic if eaten.
Hydrangea quercifolia is Alabama's state wildflower.

What does Hydrangea look like?

Hydrangeas are mostly shrubs, usually between 1 and 3 meters tall, though some can grow as climbing vines or small trees. Their flowers grow in large, rounded or flat clusters at the tips of branches. The blooms are made up of small fertile flowers surrounded by larger, showy sterile ones. Colors range from blue to pink, purple, red, and white, with some species changing color depending on soil pH.

Where does Hydrangea come from?

Hydrangeas are native to both Asia and the Americas, with the greatest variety found in eastern Asia, especially in Japan, China, and Korea. The genus was first described from plants in Virginia, but most species come from Asia. Fossil records show ancient hydrangeas in North America and Europe. The name 'hydrangea' comes from Greek, meaning 'water vessel', a nod to the shape of its seed pods.

When and how Hydrangea blooms

Hydrangeas flower from early spring through late autumn. Their blooms form at the ends of stems, with two main types: mophead (large, round) and lacecap (flat with a ring of showy flowers). Flower color in some species changes with soil pH: acidic soil brings out blue, alkaline soil produces pink or red. Most are grown as garden shrubs, and some need regular pruning.

I am a shrub with papery leaf blades that are ovate to elliptic, 5 to 14cm long and 6 to 6.5cm wide. You can find me in sparse forests or thickets in valleys or on mountain slopes or tops from 300 to 2100m above sea leve — I am a shrub with papery leaf blades that are ovate to elliptic, 5 to 14cm long and 6 to 6.5cm wide. You can find me in . Photo: Fan Wen, CC BY-SA 4.0, via Wikimedia Commons

Hydrangea macrophylla. Photo: Joanne Bergenwall Aw, CC BY-SA 3.0, via Wikimedia Commons

How Hydrangea is used

Hydrangeas are popular in gardens and landscapes for their striking flower heads. In Japan, leaves of Hydrangea serrata are used to make a sweet tea called ama-cha, poured over Buddha statues during a spring ceremony. In Korea, a similar tea is made. Some hydrangeas are state or regional emblems, such as in Alabama. All parts of the plant are toxic if eaten.

Kinds of Hydrangea

There are over 70 species of hydrangea, with Hydrangea macrophylla being the most widely grown. This species has hundreds of cultivars, including mophead and lacecap types. Notable cultivars include 'Vanilla Strawberry' and 'Runaway Bride Snow White'. Some related plants, such as Schizophragma, are also grown for their ornamental value.

What Hydrangea means

Hydrangeas have special meaning in Asia. In Japan, they are linked to Buddhist rituals and are used in ceremonies for Buddha's birthday. Pink hydrangeas are associated with heartfelt emotions in Korean flower language. Hydrangea quercifolia is the state wildflower of Alabama. The UK holds national collections of hydrangeas in public parks.

Where Hydrangea is used and seen

Da LatVietnam’s highland city famous for flowers, cool climate, and French villas

Powell GardensA 970-acre botanical garden near Kansas City, Missouri

KanzashiTraditional Japanese hair ornaments, often crafted as folded silk flowers

Cut flowersFresh flowers and buds trimmed for decoration and display

Flower gardenA garden space planted and arranged for flowering plants and seasonal blooms

Wojsławice ArboretumA vast botanical garden in southwest Poland with major rhododendron and daylily collections

Buddha's BirthdayA festival marking the birth of Gautama Buddha, celebrated across Asia in spring

Exbury GardensA woodland garden in Hampshire with famous collections of flowering shrubs

Traditions that use it

Pressed flowers The silleteros of Medellín Well dressing Hanakotoba, the Japanese language of flowers Plum and wisteria viewing

Where to see Hydrangea

🇯🇵 Kamakura · JuneHydrangea temples of KamakuraIn the rainy season, temple paths in Kamakura are lined with blue and violet hydrangeas. 🇰🇷 Gapyeong · Jan to DecThe Garden of Morning CalmA hillside garden north-east of Seoul designed to show a Korean sense of beauty in plants.

🇹🇭 Chiang Mai · Jan to DecWild Himalayan cherry on Doi InthanonPink cherry trees and royal flower gardens on Thailand's highest mountain.

🇫🇷 Paris · All yearThe flower market on the Île de la CitéGreen iron pavilions of plants and flowers on the island at the centre of Paris, a short walk from Notre-Dame. 🇵🇹 Funchal · Apr to SepLevada walks through Madeira's flowersLevel footpaths beside Madeira's old irrigation channels, through laurel forest and banks of agapanthus and hydrangea.

🇵🇹 Ponta Delgada · Jun to AugHydrangea hedges of the AzoresCountry roads on São Miguel and Faial lined for miles with blue hydrangea hedges in the Atlantic summer.

Days and festivals

Lotus Lantern Festival

Questions people ask about Hydrangea

Where do hydrangeas come from?

Hydrangeas are native to Asia and the Americas, with the greatest number of species found in eastern Asia, especially Japan, China, and Korea.

Why do hydrangea flowers change color?

The color of some hydrangea flowers, especially Hydrangea macrophylla, changes based on soil pH. Acidic soil produces blue flowers, while alkaline soil results in pink or red blooms.

Are hydrangeas poisonous?

Yes, all parts of the hydrangea plant contain toxic compounds and should not be eaten.

How are hydrangeas used in culture?

In Japan, hydrangea leaves are used to make a sweet tea for Buddhist ceremonies. In Korea, they are used for herbal tea. Hydrangeas are also state or regional emblems in some places.

What do hydrangeas symbolize?

In Korean flower language, pink hydrangeas are linked to deep feelings and affection. In Japan, they are part of Buddhist rituals.

Good reading and sources

Where this page comes from

The facts on this page come from the Wikipedia article "Hydrangea", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). Phool rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.

It may contain mistakes. It is not medical or foraging advice: many flowers are poisonous, and traditional uses are reported, not recommended. If something is wrong, tell us. Last refreshed 2026-10-03.

Hydrangea