Hydrangeas are a favourite in UK gardens thanks to their striking flower heads and versatility. Pruning them at the right time is essential to maintain their shape, encourage healthy growth, and maximise flowering. However, not all hydrangeas are pruned the same way, so understanding the type you have is crucial.

Types of Hydrangeas and Their Pruning Needs

Hydrangeas fall into several main types, each with different flowering habits:

Hydrangea macrophylla (Bigleaf or Mophead)
- Flowering: On old wood (last year’s growth)
- Pruning time: Late summer or early autumn, after flowering has finished
- How to prune: Remove dead or damaged stems and lightly trim to shape. Avoid cutting too much, or you risk losing next year’s blooms.
Hydrangea paniculata (Panicle)

Flowering: On new wood (current year’s growth)
Pruning time: Late winter to early spring (February–March)
How to prune: Cut back last year’s stems to a healthy set of buds to encourage strong new growth and large flower heads.

Hydrangea arborescens (Smooth Hydrangea, e.g., ‘Annabelle’)
- Flowering: On new wood
- Pruning time: Late winter or early spring
- How to prune: Cut stems back to 30–40 cm above the ground. This vigorous pruning promotes big, robust blooms.
- Hydrangea quercifolia (Oakleaf Hydrangea)
- Flowering: On old wood
- Pruning time: Immediately after flowering (summer)
- How to prune: Remove spent flower heads and shape lightly. Avoid heavy pruning in winter, as this will remove next season’s flowers.

Use sharp, clean tools: This prevents disease and ensures clean cuts.
Remove dead or diseased wood first: Always prune unhealthy stems before shaping the plant.
Avoid over-pruning old-wood bloomers: Cutting them too hard can reduce flowering the following year.
Shape lightly: Hydrangeas generally look best when left to grow naturally, with just enough pruning to keep them tidy.

Type	Best Pruning Time	Notes
Bigleaf (Mophead)	Late summer/early autumn	Prune after flowering; minimal cutting
Panicle	Late winter/early spring	Can be cut hard for big blooms
Smooth (‘Annabelle’)	Late winter/early spring	Cut stems back to encourage strong flowers
Oakleaf	Immediately after flowering	Shape lightly; avoid winter pruning

By pruning at the correct time, your hydrangeas will not only look neat but also produce the most spectacular blooms year after year.

Frequently Asked Questions About Pruning Hydrangeas

When is the best time to prune hydrangeas in the UK?

The timing depends on the type: mopheads after flowering (late summer), panicles and smooth hydrangeas in late winter or early spring

How do I know which type of hydrangea I have?

Bigleaf/mophead blooms on old wood, panicles and smooth hydrangeas flower on new wood, and oakleaf hydrangeas have distinctive lobed leaves

Can I prune hydrangeas in winter?

Only for new-wood bloomers like panicle and smooth hydrangeas. Avoid cutting old-wood bloomers in winter to prevent losing next year’s flowers.

How much should I prune hydrangeas?

Remove dead or damaged stems first, then lightly shape old-wood bloomers. New-wood types can be cut back more heavily to encourage big blooms.

Will pruning affect next year’s flowers?

Yes. Pruning old-wood bloomers too hard can reduce blooms, but new-wood bloomers benefit from winter pruning for bigger flowers.

What tools should I use for hydrangea pruning?

Use sharp, clean secateurs or garden shears. This prevents disease and ensures smooth cuts for healthy growth.