Hydrangea

I drew the hydrangea in the cool end of its colour range, the blue that acid soil produces when aluminium is available to the plant. In Japan that blue belongs to the rainy season: grey skies, wet pavements, the sound of rain on temple roofs. What looks like one large flower is a colony of many small ones. This hydrangea wall art follows the plant from that colour back to its structure.

In shortHydrangea macrophylla is a deciduous shrub from Japan whose flower colour follows the chemistry of the soil. Its showy heads are made of sterile sepals, not petals. The plate shows rounded flower heads in purple and blue with large green leaves.

Key Facts

Why does a hydrangea change colour with the soil?

A hydrangea changes colour because soil chemistry controls how much aluminium the plant can take up. In acidic soil aluminium is available, and the flowers turn blue. In alkaline or near-neutral soil it is not, and they turn pink, with purple shades in between.

The pigments are anthocyanins, the same family that colours red cabbage and many berries. Aluminium shifts their shade toward the blue end. White varieties are unaffected by the soil. The same cultivar can therefore bloom blue in one garden and pink in the next, and a plant can change over a few seasons if the soil around it changes. The colour records the ground the plant stands in, which makes a hydrangea a living test of the soil beneath it.

Are the petals of a hydrangea really sepals?

Yes. The showy parts of a hydrangea head are sepals, not petals. They belong to flowers that are sterile, enlarged only to attract pollinators and producing no seed. The real flowers are small, fertile and easy to miss.

Two forms show this clearly. In a mophead every flower is sterile, and together they form a round cluster 13 to 25 cm across. In a lacecap a flat centre of tiny fertile flowers is ringed by large sterile ones, so the biology is easy to read: the small flowers are the working part, and the large ones are the advertisement. Garden forms are usually mopheads, while wild plants tend to be lacecaps.

Where does the hydrangea come from?

Hydrangea macrophylla is native to Japan, where it grows in coastal regions. It has been cultivated there for centuries, with hundreds of varieties developed, and it is now among the most widely grown ornamental shrubs in the world. The leaves are broad, glossy and toothed, up to 20 cm long.

In Japan the plant is called ajisai, a word that carries the mood of the rainy season in June, when the flower is at its best. The plant likes moisture and tolerates shade, which is why it thrives in temperate gardens with damp summers. Its place in the gardens of northern Europe, where it is called hortensia in several languages, is a story of cultivation across several centuries.

How long does a hydrangea flower last?

A hydrangea head lasts for months, much longer than most flowers. Summer is the main bloom, beginning around June in cool climates. Mopheads and lacecaps flower on stems grown the previous year, so hard pruning in spring can remove the season’s flowers. The sepals stay colourful through the season and then fade rather than fall.

As they age, the heads dry on the shrub, turning papery and brown. Many stay on through winter, holding their shape against frost. A dried head is an ornamental subject in its own right: a still life in the garden, already half a drawing. The long-lasting sepals are one reason hydrangeas are cut for vases and dried for winter arrangements. Even a faded head keeps the structure that made it worth drawing in the first place.

What does the hydrangea mean in flower language?

In the Victorian language of flowers the hydrangea stands for gratitude and heartfelt emotion. The plant became a garden favourite in that era, and hortensia remains its usual name in many European languages.

In Japan its mood is different: cool, wet and a little wistful, tied to the rainy season rather than to a gesture. The meaning is a cultural layer on the plant and shifts from place to place. The studio’s essay on hortensia folklore covers the myths and symbolism in more depth.

Drawing the hydrangea

The plate shows a hydrangea in flower: rounded heads of densely packed blooms in purple and blue, framed by large glossy green leaves. I chose the cool end of the range because blue is the colour most tied to the hydrangea in Japan, and because it is the colour the soil gives when the chemistry is acid.

A hydrangea head is made of hundreds of individual florets, each tilted at its own angle, and that is what gives the sphere its depth. A photograph usually flattens a head into a soft mass of colour. The hand-drawn digital illustration keeps the leaves and the flower head separate, so the broad leaves and the clustered sepals can each be read.

Where does a hydrangea print work on a wall?

The deep, quiet blue of the hydrangea reads calmly against white, grey, pale green and natural linen. The plate suits a bathroom, a bedroom, a living room or any cool, textured interior. A white frame keeps it fresh, while a pale grey or dark wood frame gives it more depth. It belongs to The Garden collection and to Workspace Green, and it appears in the bathroom guide. In the photograph below, the hydrangea hangs with a fern and a monstera leaf as three framed prints. For spas and guest rooms, the studio plans it within wider hospitality projects.

Fine-art print →

Frequently Asked Questions

Is hydrangea toxic to cats and dogs?

Yes, mildly. Hydrangea contains a cyanogenic glycoside, and cats, dogs and horses that eat it can show vomiting, depression and diarrhoea. Serious poisoning is rare. Keep the living plant and cut stems out of reach of pets.

Why is my hydrangea pink instead of blue?

The soil is probably near neutral or alkaline, so aluminium is not available to the plant. Blue flowers need acidic soil. Some varieties are bred as pink or white and will not turn blue at all, since white forms ignore soil chemistry.

What is the difference between a mophead and a lacecap hydrangea?

A mophead has a round ball of sterile flowers. A lacecap has a flat disc of small fertile flowers in the centre, ringed by larger sterile ones. Both are forms of Hydrangea macrophylla. The lacecap is closer to the wild form.

Where does a hydrangea grow best?

Hydrangea macrophylla likes moisture and tolerates shade. A position with morning sun and afternoon shade suits it, in rich, well-draining soil that never dries out. The name hydrangea comes from Greek roots linked to water, which fits its thirst.

How is this print made, and how does it reach me?

There are two formats. The digital download is a high-resolution file that you print yourself, at home or at a print shop; no physical item is shipped. The fine-art print is printed to order on archival paper or canvas, framed or unframed, in sizes from small prints to over 150 cm (60 inches), and delivered to your door.