Bigleaf Hydrangea (Hydrangea macrophylla)

What it is

A coarse-textured shrub grown for one thing: big domed flower heads through summer, blue or pink depending on soil. It reads as mass rather than outline, so it fills a middle layer and hides the bare ankles of whatever stands behind it — it is not a specimen to stand alone in a lawn.

Hardiness and sun

Our library lists USDA zones 6–11 for this species, in part shade. At the cold edge the plant usually survives and the flower buds do not: a warm spell followed by a hard frost takes next summer’s flowers while the shrub leafs out fine. That is why a zone-5 gardener can own a healthy hydrangea that never blooms.

Size and spacing

Plan for about 3–6′ of height and 3–6′ of width at maturity. Space plants 3–6′ apart. It is as wide as it is tall, so the spacing number is not padding — plant three at 3 ft and you get one lumpy mass, not three shrubs.

How to grow it

Morning sun with afternoon shade. It wilts visibly in heat and wants steady moisture, so mulch and do not let it dry out. Flower colour follows soil: acidic soil turns blooms blue, alkaline turns them pink.

Prune as little as possible, and only just after flowering. This species sets next year’s buds on old wood in late summer, so a tidy-up in autumn or spring removes the flowers before they open — the single most common reason a healthy bigleaf hydrangea does not bloom.

Fall and winter

Bigleaf hydrangea is not grown for autumn leaves: our source records its fall color as gold or yellow at best, and often not worth noting. The show is the flower heads, which stay on the shrub as they dry and fade through late summer into autumn. Leave them. Next summer's flower buds are already sitting on the stems below them, set in late summer, so cutting the old heads off in autumn to tidy the bed takes those buds with them. Through winter it is a clump of bare stems holding dry heads. Trim the old heads in spring, just above the first fat pair of buds, once you can see which stems are alive.

Where to place it

Give it the east side of the house or the edge of high, light shade: morning sun, shelter from the afternoon. It belongs in the middle layer of a bed, with something taller behind and a low edge in front, and at 3–6 ft wide it needs that much room from a path or the foundation. Keep it out of reach of thirsty tree roots and away from the hottest wall, because it wilts the moment the soil dries. It tolerates salt, which is why it does well in coastal gardens. Plant it where you can water it in a dry spell without dragging a hose across the lawn.

Named selections in our library

These are variations of Hydrangea macrophylla — different flowers or habit, same plant underneath. They live on this page rather than each having one of their own.

• Endless Summer Hydrangea

  Hydrangea macrophylla 'Bailmer'

  4–9 · 3–4′ · $24–55

• Hydrangea

  Hydrangea macrophylla 'Lemon Daddy'

  6–9 · 3–4′ · $24–55

• Glowing Embers Hydrangea

  Hydrangea macrophylla 'Glowing Embers'

  6–9 · 3–5′ · $40–85

What actually pairs with it

Every plant below shares this one's hardiness range, takes the brightest light it is grown in, wants the same kind of soil moisture, and fills a different layer of the border — so it can stand beside it instead of competing with it. Picked from our verified library against those conditions, not copied from a general list.

• Japanese Spikenard

  Aralia cordata 'Sun King'

  back of the border

  4–8 · part sun · 3–6′ · $8–20

• Frances Williams Hosta

  Hosta 'Frances Williams'

  front edge

  3–8 · part sun, shade · 1.5–2′ · $8–20

• Black Lace Elderberry

  Sambucus nigra 'Black Lace'

  back of the border

  4–7 · full sun, part sun · 6–8′ · $24–55

• Fanal Astilbe

  Astilbe × arendsii 'Fanal'

  front edge

  3–8 · part sun, shade · 1–1.5′ · $8–20

• Yellow Twig Dogwood

  Cornus sericea 'Flaviramea'

  back of the border

  3–8 · full sun, part sun · 5–6′ · $24–55

• Japanese Painted Fern

  Athyrium nipponicum 'Pictum'

  front edge

  3–8 · part sun, shade · 1–1.5′ · $8–20

Meeting these conditions makes a pairing possible, not certain. Soil, drainage and how much room you actually have decide the rest.