When to Prune Hydrangeas: Get Bigger Blooms Every Year

When you prune a hydrangea depends entirely on its type. Mophead, lacecap and oakleaf hydrangeas flower on last year’s wood, so prune them only lightly — in early spring or just after flowering. Panicle and smooth types (including ‘Annabelle’) flower on this year’s growth and can be cut back hard in late winter for bigger blooms. Climbing hydrangeas are pruned after they flower, in summer.

Hydrangeas are among the most forgiving shrubs in a British garden, which is exactly why so many of them are pruned at the wrong moment. Cut a mophead back in February the way you would a buddleia and you will spend the summer staring at a healthy green bush with no flowers at all. The plant is fine; the flowers are in the compost. The good news is that the rule, once you have it, is simple and it holds for every type.

The one thing that matters

Old wood or new wood: the only question that counts

Every hydrangea sits in one of two camps, and which camp yours is in decides both when you prune and how brave you can be with the secateurs.

Old-wood hydrangeas set next year’s flower buds on stems that grew this year — the buds are already formed and sitting on the plant through winter. Cut those stems off and you cut off the flowers. Mophead, lacecap, mountain (serrata) and oakleaf hydrangeas all flower on old wood.

New-wood hydrangeas make their flowering stems from scratch each spring, so you can cut them right down in late winter and they will still flower the same summer. Panicle (paniculata) and smooth (arborescens, which includes ‘Annabelle’) hydrangeas flower on new wood. This is why they, and only they, can be cut hard.

Telling them apart on the plant: the new wood of the current season is darker and the older wood is paler and woodier; the very newest growth is tipped with a single fat leaf bud, which you leave alone. If you are still unsure, the flower shape gives it away — round mophead balls and flat lacecap discs are old wood; tall conical panicles and big round white drumsticks (‘Annabelle’) are new wood.

Type by type

How to prune each type of hydrangea

Mophead and lacecap (Hydrangea macrophylla) — old wood

These are the classic blue, pink and white hydrangeas of seaside front gardens. Leave the faded flowerheads on the plant over winter: they look quietly handsome in frost and, more usefully, they shelter the tender buds below from cold. In early spring, once the worst frosts have passed, cut each old mophead head back to the first strong, healthy pair of buds beneath it. Lacecaps are a little hardier, so you can cut their spent heads back to the second pair of leaves below the head soon after flowering, which stops the plant wasting energy on seed.

To keep an established plant flowering well, also cut one or two of the very oldest stems right down to the base each year. New stems replace them and carry the better flowers. Resist the urge to shear the whole thing over: on old wood, that is how you lose a season.

Panicle and smooth / ‘Annabelle’ (paniculata and arborescens) — new wood

These are the ones you can be bold with. Because they flower on new growth, prune in late winter or early spring — February to March in most of the UK — cutting last year’s stems back to a low, permanent framework of branches. The Royal Horticultural Society’s guidance is to cut to the lowest healthy pair of buds for the largest flowerheads, leaving a framework usually no more than about 25cm (10in) high, or around 60cm (2ft) if you want a taller plant. Take out any thin, crossing or congested stems while you are there.

The slight catch with ‘Annabelle’ is that those enormous heads can flop in summer rain on thin new stems, so either prune a little less hard to keep sturdier wood, or be ready with discreet supports.

Mountain hydrangea (Hydrangea serrata) — old wood

A daintier cousin of the macrophyllas, and pruned in exactly the same way: a light early-spring tidy back to strong buds, plus the odd old stem removed at the base. Nothing dramatic.

Oakleaf and most other species (quercifolia, aspera) — minimal

Oakleaf hydrangeas, with their handsome lobed leaves and autumn colour, ask for very little: in spring, remove dead or over-long stems and leave the rest. If you do want to cut one back harder, do it straight after flowering rather than in spring, because it too flowers on old wood. The same light touch suits Hydrangea aspera.

Climbing hydrangea (anomala subsp. petiolaris) — after flowering

The self-clinging climber that smothers a shady north wall in creamy summer lace. Prune it after it has flowered, in mid to late summer, shortening any over-long shoots that have wandered onto gutters or windows. Most of the flowers are produced towards the top of the plant, so leave as much of the upper growth unpruned as you can. An established climber will take hard renovation, but stagger it over three or four years rather than doing it all at once, or you will lose flowers for a couple of summers.

Tidying versus cutting

Deadheading is not the same as pruning

It is worth separating the two jobs, because they happen at different times and do different things. Deadheading is removing spent flowers; pruning is shaping the plant and managing its stems. On old-wood hydrangeas the temptation is to deadhead in autumn for tidiness — resist it. The faded heads protect next year’s buds through winter, and a hard frost on freshly exposed buds is one of the commonest reasons a mophead fails to flower. Leave the heads on, enjoy them silvered with frost, and deal with them in early spring instead.

Leave the dead heads on over winter. They earn their keep protecting the buds below.

The bigger-blooms question

How to get bigger blooms

“Bigger blooms” comes down to where the plant spends its energy, and that is where the old-wood and new-wood split pays off. When you hard-prune a panicle or smooth hydrangea down to a low framework, the plant pushes all its spring vigour into a small number of new stems, and the result is fewer but noticeably larger flowerheads on strong upright growth. Prune more lightly and you get more heads, but smaller ones. So the lever for bigger blooms on these two types is a harder prune.

On mophead and lacecap hydrangeas the route to better flowering is the opposite: don’t over-prune. Keep the old wood that carries the buds, refresh the plant by removing a couple of the oldest stems each year, and feed and mulch in spring. A general-purpose feed or a rose fertiliser applied as growth begins, with a mulch of compost or well-rotted manure, supports a fuller display without any extra cutting.

Bringing one back

Renovating an old, woody, overgrown hydrangea

If a hydrangea has become a congested, leggy thicket with flowers only at the top, it can be brought back. On a mophead or lacecap, the gentlest method is to remove up to about a third of the oldest stems at the base each year over three years, which keeps some flowers coming while the plant rebuilds. The drastic option is to cut every stem down to the base in early spring; the plant will recover strongly but will not flower that summer, returning to bloom the following year. A new-wood panicle or smooth hydrangea, by contrast, positively enjoys being cut back hard and will flower the same season.

Kit

The tools you actually need

For most hydrangeas a single sharp, clean pair of secateurs does the whole job, and a hydrangea is a good reason to finally sharpen the pair you already own — blunt blades crush stems and invite die-back. You only need loppers for the occasional thick old stem near the base, and you can borrow those rather than buy them. A pair of gloves saves your fingers on the woodier cuts. There is nothing here that needs to be expensive: clean and sharp beats new and dull every time.

When it goes wrong

Why didn’t my hydrangea flower?

The single most common reason an otherwise healthy hydrangea produces leaves but no flowers is that it was pruned at the wrong time or too hard — almost always an old-wood mophead cut back in late winter, which removes the buds set the previous summer. The cure is to stop pruning hard, deadhead lightly to the first buds, feed in spring and wait a year. The other usual suspects are a late frost catching exposed buds (another argument for leaving the dead heads on), too much shade, or a young plant still settling in. Pruning rarely kills a hydrangea; the worst a bad cut usually costs you is one season of flowers.

Common questions

Hydrangea pruning FAQ

Can you cut hydrangeas right back to the ground?

Only the new-wood types — panicle (paniculata) and smooth (arborescens, including ‘Annabelle’). They flower on fresh spring growth, so cutting them low in late winter gives bigger blooms the same summer. Never do this to a mophead or lacecap; you would remove the buds and lose the flowers.

Should you deadhead hydrangeas?

Yes, but timing matters. On mophead and lacecap hydrangeas, leave the faded heads on over winter to protect the buds below from frost, then deadhead in early spring. New-wood types can be deadheaded more freely as they fade.

When is it too late to prune hydrangeas?

For new-wood types, late winter to early spring is ideal; pruning much past the start of growth only delays flowering. For old-wood types, avoid hard cuts from late spring onwards, as you will be removing the buds for that summer. A light deadhead is fine at almost any time.

Do you cut hydrangeas back for winter?

No. Leave the flowerheads on through winter — they look attractive in frost and shelter the buds beneath. Save the tidying for early spring.

When should I prune an ‘Annabelle’ hydrangea?

In late winter or early spring, February to March. As a smooth (arborescens) hydrangea it flowers on new wood, so cut it back hard to a low framework for the biggest heads — then be ready to support them in summer rain.

What happens if I don’t prune my hydrangea at all?

Miss a year and you will barely notice. Over several years, though, an unpruned hydrangea tends to get larger, more congested and slightly less showy, with smaller flowers. A proper prune restores it, though it may take a season or two to regain its shape.

For the rest of the year’s jobs, see our month-by-month gardening guide; for the other shrub everyone prunes at the wrong time, our companion guide on when to prune roses follows exactly the same be-led-by-the-plant logic. If your hydrangeas live in pots, our small garden ideas may help you make the most of a tight space.

Written by Linda Garrould. Timings are for UK gardens and follow Royal Horticultural Society pruning guidance. Updated 14 June 2026.