Hydrangea species compared: macrophylla, paniculata, arborescens — which to choose?

Which hydrangea species for your garden?

Hydrangeas are the most popular shrub in UK and Northern European gardens. But there are three very different species — with different bloom times, colours, growth habits, and maintenance. Wrong choice brings disappointment.

This is not "one best", but "best for your situation". Read what you want, then choose species.

Comparison: 3 hydrangea species

TL;DR: macrophylla = compact, blooms July-October, half shade; paniculata = large, white plumes, full sun; arborescens = very long bloom June-October, full sun OK.

Hydrangea macrophylla

Best for: half shade, compact space, pink/blue colour.

Bloom: July-October (4 months). Large ball-shaped flowers (15-25 cm).

Colour: pink standard, blue in acidic soil (pH < 6), white varieties exist. Colour can shift with acidifying powder.

Height: 120-150 cm, very compact. Perfect for small gardens or border front.

Cultivars: 'Endless Summer' (red-pink, very long bloom), 'Nikko Blue' (blue, very popular), 'Blushing Bride' (white-pink), 'Bailmer' (dark purple-blue).

Pruning: light in March, spare old branches (last year's growth). Hard pruning = no flowers this year.

Water needs: regular water (3x week in dry). Thirstier than other species.

Downside: can freeze in harsh winters (-15°C). Flowers only on last year's wood (don't hard-prune!).

Hydrangea paniculata

Best for: full sun, large space, white plumes, long season.

Bloom: July-October (4 months). Pyramidal (pointed) flowerhead (20-30 cm).

Colour: white → pink → brown. Beautiful transition. Blue not possible.

Height: 150-250 cm. Can grow very large. Perfect as "flower shrub" in open space.

Cultivars: 'Vanilla Fraise' (white base, pink-red top, very popular), 'Phantom' (large white, 30 cm panicles), 'Limelight' (green-white base, pink-red end), 'Grandiflora' (classic large white).

Pruning: hard in March (to 60 cm) — recommended. Produces thicker bloom and larger panicles.

Water needs: moderate water (2x week in dry). More drought-tolerant than macrophylla.

Advantage: very frost-hardy (-25°C), large and striking, can be hard-pruned.

Hydrangea arborescens

Best for: very long bloom (June-October!), half shade, natural form.

Bloom: June-October (5 months!) — VERY long. White panicles, narrower than paniculata.

Colour: white → cream-white → red-brown autumn. Blue not possible.

Height: 150-200 cm, looser form than macrophylla.

Cultivars: 'Annabelle' (classic white, very popular, 20 cm panicles), 'Incrediball' (large balls, very striking, 30 cm), 'Alice' (white, very large, compact).

Pruning: moderate in March — spare old wood for structure. Or prune hard (carefully).

Water needs: regular water, but more drought-tolerant than macrophylla.

Advantage: very frost-hardy (-30°C), very long bloom (June-October), more compact than paniculata.

Which hydrangea to choose per situation?

Small garden, half shade, compact: Hydrangea macrophylla 'Endless Summer' or 'Nikko Blue'. 120 cm, no pruning.

Large garden, full sun, striking: Hydrangea paniculata 'Vanilla Fraise'. 200 cm, hard prune March. Very striking white-pink-red transition.

Very long bloom, half shade: Hydrangea arborescens 'Annabelle'. 150 cm, June-October flower, very long.

Blue hydrangeas: Hydrangea macrophylla 'Nikko Blue' or 'Blue Diamond'. Acidic soil (pH 5.5-6).

Red-pink: Hydrangea paniculata 'Vanilla Fraise' or Hydrangea macrophylla 'Endless Summer'. Both very long bloom and popular.

Planting and care

Plant hydrangeas in October or March. Water regularly (not drought). Feed compost in March.

Pruning: macrophylla carefully (light trim last year's wood). Paniculata hard (to 60 cm). Arborescens moderate (spare structure).

Blue colour: acidic soil helps (pH 5-6.5). Adding lime = pinker. Adding sulfate = bluer. This takes weeks; plan ahead.

Root rot: hydrangeas want moist but not waterlogged. Drainage helps.

Frequently asked questions

Why can't I get blue hydrangeas?

Alkaline soil (pH > 7) makes hydrangeas pink. Acidic soil (pH < 6) gives blue. You can adjust pH, but it takes weeks. Better: choose varieties that are already blue (Nikko Blue, Blue Diamond) and give acidic soil.

Which hydrangea blooms longest?

Arborescens (June-October, 5 months). Macrophylla and paniculata both July-October (4 months).

Can I hard-prune hydrangeas?

Macrophylla: carefully (only last year's wood). Paniculata: yes, hard pruning recommended. Arborescens: moderate (spare structure).

Are hydrangeas frost-hardy?

Macrophylla: sensitive (-15°C max, flowers freeze). Paniculata: very hardy (-25°C). Arborescens: very hardy (-30°C). Flowering branches may freeze but plant rarely dies.

Your hydrangeas

At [gardenworld.app](https://gardenworld.app) you upload a photo and see how hydrangea planting transforms your garden July-October. No guesswork — you see it instantly.