When Is the Best Time to Prune Flowering Shrubs?

Pruning can improve the shape, health, and flowering of a shrub.

It can also remove an entire season of blooms when it is done at the wrong time.

The safest way to decide when to prune is to learn whether the shrub flowers on old wood or new wood.

Spring-blooming shrubs usually form their flower buds during the previous growing season. Those buds remain on the branches through winter and open in spring. Pruning during fall, winter, or early spring can remove them before they ever bloom.

Summer-flowering shrubs usually form their flower buds on new growth produced that same year. These plants are often pruned during late winter or early spring before new growth begins.

At Bobby & Lynn’s Plant Farm in Dallas, Georgia, we encourage homeowners to identify the shrub before reaching for the pruners. A few minutes spent confirming the plant can prevent a year without flowers.

Quick Answer

As a general rule:

• Prune spring-flowering shrubs shortly after they finish blooming.
• Prune summer-flowering shrubs in late winter or early spring.
• Remove dead, broken, diseased, or dangerous branches whenever necessary.
• Avoid heavy pruning in fall because it may encourage tender new growth before winter.
• Do not prune a shrub simply because the calendar says it is time.
• Confirm whether the plant blooms on old wood, new wood, or both.

UGA Extension recommends pruning spring-flowering shrubs after they bloom and pruning most summer-flowering shrubs before spring growth begins.

Common spring bloomers include:

• Azalea
• Forsythia
• Weigela
• Lilac
• Spring-blooming spirea
• Oakleaf hydrangea
• Bigleaf hydrangea
• Mountain hydrangea
• Camellia, depending on bloom season

Common summer bloomers include:

• Panicle hydrangea
• Smooth hydrangea
• Rose of Sharon
• Butterfly bush
• Crape myrtle
• Abelia
• Vitex
• Summer-blooming spirea
• Beautyberry

Quick Pruning-Time Comparison

What Is Old Wood?

Old wood is growth produced during the previous year or earlier.

Spring-flowering shrubs often form their flower buds on this older growth during summer or fall. The buds remain attached through winter and open the following spring.

If those branches are cut during winter, the flower buds are removed too.

Shrubs that commonly bloom on old wood include:

• Azaleas
• Forsythia
• Weigela
• Lilacs
• Oakleaf hydrangeas
• Many bigleaf hydrangeas
• Mountain hydrangeas
• Spring-blooming spirea
• Flowering quince
• Rhododendrons

Prune these plants soon after flowering so they have enough time to produce new branches and set buds for the following year.

What Is New Wood?

New wood is growth produced during the current growing season.

Summer-flowering shrubs commonly form their buds on these new stems.

They can usually be pruned before spring growth begins without sacrificing that summer’s flowers.

Shrubs that commonly bloom on new wood include:

• Panicle hydrangeas
• Smooth hydrangeas
• Rose of Sharon
• Butterfly bush
• Crape myrtle
• Abelia
• Vitex
• Beautyberry
• Summer-blooming spirea

Pruning is not always required.

A healthy shrub that fits its space may need only occasional thinning and removal of dead wood.

Spring-Flowering Shrubs to Prune After Blooming

Azaleas

Azaleas form flower buds during the previous growing season.

The safest time to shape them is soon after their main flowering period ends.

Pruning too late in summer may remove buds being formed for the following spring.

When pruning azaleas:

• Remove dead branches first.
• Thin crowded stems.
• Shorten branches to a side branch.
• Avoid repeated tight shearing.
• Finish major shaping soon after flowering.
• Do not cut every plant into the same round shape.

Older overgrown azaleas may tolerate rejuvenation pruning, but the plant may lose a season of flowers while recovering.

Forsythia

Forsythia produces yellow flowers on older branches before or as the leaves emerge.

Prune it after flowering.

The best method is usually renewal thinning:

1. Remove several of the oldest stems at ground level.
2. Keep strong younger canes.
3. Remove damaged and crossing growth.
4. Preserve the shrub’s natural arching shape.

Avoid shearing forsythia into a tight ball. That creates dense outer growth and reduces its graceful form.

Weigela

Weigela produces most of its spring flowers on older wood.

Prune after its main spring bloom.

Remove:

• Dead branches
• Weak growth
• Crossing stems
• Several of the oldest canes when renewal is needed

Some newer weigelas rebloom lightly later in the season. Heavy pruning after spring bloom may reduce that secondary display, but it is still safer than cutting away the main buds during winter.

Spring-Blooming Spirea

Spring-flowering spireas generally produce white flowers along arching older stems.

Prune them after flowering.

Thin older stems at ground level rather than shearing the entire shrub into a flat mound.

Summer-blooming Japanese spireas follow a different schedule, so identify the type before pruning.

Flowering Quince

Flowering quince blooms on older wood in early spring.

Prune after flowering.

Wear gloves because many types have thorny branches.

Remove crossing stems, suckers, and some older growth to maintain a manageable shape.

Summer-Flowering Shrubs to Prune Before Spring Growth

Rose of Sharon

Rose of Sharon flowers on new growth.

Prune in late winter or early spring when size control or thinning is needed.

Remove:

• Dead wood
• Crossing branches
• Weak interior stems
• Unwanted seedlings
• Damaged growth

Heavy pruning can produce fewer but larger shoots and flowers. Light pruning preserves more branches and usually creates a fuller plant.

Butterfly Bush

Butterfly bush flowers on new growth.

Older plants can become tall, woody, and bare near the base.

In late winter or early spring:

• Remove dead stems.
• Shorten healthy growth as needed.
• Thin weak or crowded branches.
• Cut older stems lower when renewal is needed.
• Avoid pruning so early that tender regrowth is exposed to hard freezes.

Compact cultivars may need less severe pruning than traditional large varieties.

Crape Myrtle

Crape myrtle flowers on new growth.

Pruning should be based on plant structure, not habit.

Remove:

• Dead branches
• Crossing limbs
• Branches growing toward the center
• Suckers
• Small unwanted shoots from the lower trunk
• Branches that interfere with structures or traffic

Do not top crape myrtles.

Cutting all major branches back to stubs creates weak shoots, large wounds, poor structure, and an unnatural appearance.

Choose a cultivar that fits the space instead of using severe pruning to control a tree that is too large.

Abelia

Abelia blooms on new growth and can be pruned in late winter or early spring.

Older plants often respond better to thinning than shearing.

Remove some of the oldest stems near ground level. This encourages fresh growth while preserving the shrub’s natural arching form.

Repeated shearing can create a dense shell of foliage and a bare interior.

Summer-Blooming Spirea

Many Japanese spireas bloom on new growth.

Prune in late winter or early spring to:

• Remove weak stems
• Reduce size
• Improve shape
• Encourage fresh colorful foliage
• Promote summer flowers

A light trim after the first bloom may encourage another flush.

Beautyberry

Beautyberry flowers and produces berries on new growth.

It can be pruned in late winter or early spring.

Older shrubs may be cut back substantially when renewal is needed, but lighter selective pruning often preserves a more natural shape.

How to Prune Hydrangeas Correctly

Hydrangeas cause more pruning confusion than almost any other flowering shrub.

Different species follow different rules.

Bigleaf Hydrangeas

Bigleaf hydrangeas include many mophead and lacecap types.

Traditional varieties usually bloom on old wood.

Reblooming varieties may flower on both old and new growth.

Examples include:

• Endless Summer
• Summer Crush
• BloomStruck
• Twist-n-Shout
• Blushing Bride

UGA Extension explains that traditional bigleaf hydrangeas bloom on old wood, while reblooming varieties such as Endless Summer may flower on both old and new growth.

Best approach

Prune as little as possible.

In spring:

• Wait for new growth to appear.
• Remove only stems that are clearly dead.
• Do not assume a leafless stem is dead too early.
• Avoid cutting the entire shrub to the ground.

After flowering:

• Remove spent blooms when desired.
• Shorten an occasional overlong stem.
• Thin a few old canes at ground level.
• Finish shaping before late summer.

Reblooming does not mean pruning cannot reduce flowers. Removing old stems may eliminate the earliest flower buds even when the plant can later bloom on new growth.

Mountain Hydrangeas

Mountain hydrangeas are closely related to bigleaf hydrangeas.

Many bloom on old wood, while some newer cultivars rebloom.

Use the same cautious approach:

• Remove dead wood after growth begins.
• Prune lightly after flowering.
• Avoid fall and winter pruning.
• Do not cut the whole plant down unless severe damage requires it.

Oakleaf Hydrangeas

Oakleaf hydrangeas bloom on old wood.

Prune after flowering and only when necessary.

Remove:

• Dead branches
• Damaged stems
• Crossing growth
• A few of the oldest canes
• Branches interfering with paths or structures

Oakleaf hydrangeas have a broad natural form and attractive peeling bark. Heavy shearing destroys much of their character.

Panicle Hydrangeas

Panicle hydrangeas bloom on new wood.

Examples include:

• Limelight
• Little Lime
• Bobo
• Phantom
• Pink Diamond
• Strawberry Vanilla
• Quick Fire
• Pee Gee

Prune in late winter or early spring if needed.

You can:

• Remove dead or weak stems.
• Thin crowded growth.
• Shorten long branches.
• Improve structure.
• Reduce size moderately.

Panicle hydrangeas do not need to be cut nearly to the ground every year.

Repeated severe pruning may create thin, fast-growing stems that bend beneath heavy flower clusters.

Smooth Hydrangeas

Smooth hydrangeas bloom on new wood.

Examples include:

• Annabelle
• Incrediball
• Invincibelle Spirit II

Prune during late winter or early spring.

Some gardeners cut them close to the ground. Others leave 12 to 24 inches of older stems.

Leaving stronger lower stems may help support the new growth and flowers.

Cutting too low can produce long weak stems that flop after heavy rain.

Pruning Hydrangea Comparison

Dead Wood Can Be Removed Any Time

Dead, diseased, broken, or dangerous branches do not need to remain until the ideal seasonal pruning date.

UGA Extension recommends checking shrubs for the four Ds: dead, diseased, dying, and damaged branches.

Remove those branches whenever they are identified.

Before deciding a branch is dead:

1. Bend a small twig gently.
2. Scratch a tiny section of bark.
3. Look for green tissue underneath.
4. Check whether buds are swelling.
5. Wait longer in spring if the shrub is slow to leaf out.

Hydrangeas sometimes look dead before growth appears lower on the stems.

How Much Should You Remove?

For routine pruning, avoid removing more than about one-third of a healthy shrub at one time.

Removing too much can:

• Stress the plant
• Trigger excessive soft growth
• Reduce flowering
• Expose previously shaded branches
• Create an unnatural shape
• Weaken the structure

The one-third guideline is not an absolute rule.

Severe storm damage, rejuvenation, or a shrub with several dead stems may require a different approach.

When possible, spread major correction over two or three seasons.

Thinning Cuts Versus Heading Cuts

Understanding the type of cut can improve the result.

Thinning Cut

A thinning cut removes a branch back to:

• The ground
• A larger branch
• The trunk
• A strong side branch

Thinning:

• Opens the interior
• Improves airflow
• Preserves natural shape
• Reduces crowding
• Encourages balanced growth
• Is less likely to create a dense outer shell

Heading Cut

A heading cut shortens a branch partway.

It usually causes several new shoots to grow near the cut.

Heading cuts can:

• Make growth bushier
• Reduce height temporarily
• Encourage dense branching
• Create weak clusters when overused

Use heading cuts carefully and cut just above a healthy outward-facing bud or side branch.

For most mature flowering shrubs, selective thinning produces a more natural result than repeated shearing.

Why Repeated Shearing Reduces Flowers

Shearing cuts every branch at the same outer surface.

This can create:

• Dense leaves on the outside
• Bare branches inside
• Poor airflow
• Weak twiggy growth
• Fewer flowers
• An unnatural shape
• Increasing shrub width

Shearing is appropriate for formal hedges designed to be maintained that way.

It is usually not the best treatment for:

• Forsythia
• Hydrangea
• Weigela
• Beautyberry
• Oakleaf hydrangea
• Abelia
• Viburnum

UGA Extension recommends thinning spring-flowering shrubs rather than repeatedly shearing them when a natural flowering shape is desired.

Rejuvenation Pruning for Overgrown Shrubs

Rejuvenation pruning removes old growth to encourage new stems.

It may be useful when a broadleaf shrub is:

• Severely overgrown
• Bare near the base
• Filled with old weak stems
• Flowering poorly
• Damaged
• Blocking access
• Too dense to thin normally

Gradual Rejuvenation

This is the safer method for many shrubs.

Over three years:

1. Remove about one-third of the oldest stems at ground level.
2. Repeat the following year with another third.
3. Remove the remaining oldest stems during the third year.

This keeps part of the shrub flowering while new growth develops.

Severe Rejuvenation

Some broadleaf shrubs can be cut back to around 12 inches when spring growth begins.

UGA Extension explains that many broadleaf shrubs can recover from rejuvenation pruning, while junipers, pines, arborvitae, and other narrow-leaved evergreens may not regrow from bare old wood.

Severe rejuvenation may eliminate flowers for a season and should not be the automatic solution for a shrub planted in the wrong place.

If the plant repeatedly outgrows the site, replacement with a smaller cultivar may be the better choice.

When Not to Rejuvenate Severely

Avoid cutting these plants into leafless old wood unless you have confirmed that they can recover:

• Juniper
• Arborvitae
• Cedar
• Many cypress species
• Pine
• Spruce
• Some narrow-leaved evergreens

These plants may not produce new growth from bare older branches.

A severe cut can leave permanent holes or kill large portions of the plant.

What to Do When You Do Not Know the Shrub

When the plant is unidentified, do not guess.

Use this safer process:

1. Take clear photos of the whole plant.
2. Photograph the leaves, stems, buds, and flowers.
3. Note when it blooms.
4. Search your original plant label or receipt.
5. Check your Plant Directory.
6. Ask a local Extension office or knowledgeable nursery.
7. Remove only dead or damaged wood until identification is confirmed.

Bloom time provides a useful clue.

A shrub flowering before or during early spring often blooms on old wood. A shrub beginning its main bloom during summer often blooms on new growth.

That is a general pattern, not a guarantee.

When to Prune Reblooming Shrubs

Reblooming shrubs may flower on old wood, new wood, or both.

Examples include:

• Reblooming bigleaf hydrangeas
• Some azaleas
• Certain weigelas
• Repeat-flowering spireas
• Roses

Do not assume reblooming makes timing unimportant.

A reblooming hydrangea cut in winter may still produce later flowers on new growth, but the earliest blooms formed on old wood may be lost.

For reblooming shrubs:

• Prune lightly.
• Remove dead wood first.
• Shape after the first flowering period.
• Avoid severe annual cutting.
• Confirm the cultivar’s flowering habit.

When to Prune Abelia

Abelia flowers on new growth and can be pruned in late winter or early spring.

For an older overgrown plant:

• Remove several old stems at ground level.
• Shorten branches interfering with paths.
• Preserve the arching form.
• Avoid repeated tight shearing.

Abelia may tolerate severe rejuvenation, but gradual renewal usually preserves a better appearance.

When to Prune Crape Myrtle

Prune crape myrtle in late winter only when needed.

Focus on structure.

Remove:

• Dead branches
• Crossing limbs
• Suckers
• Inward growth
• Branches interfering with buildings or traffic

Avoid cutting every major limb to the same height.

A properly selected crape myrtle may need very little pruning.

When to Prune Butterfly Bush

Prune butterfly bush during late winter or early spring, after the danger of the coldest weather begins to pass.

Traditional varieties can be shortened substantially.

Compact varieties may require only light cleanup and renewal.

Remove stems that are:

• Dead
• Weak
• Broken
• Crowded
• Excessively old

When to Prune Rose of Sharon

Rose of Sharon blooms on new growth.

Prune before spring growth begins when:

• Size reduction is needed
• Branches cross
• The shrub is too dense
• Winter damage is present
• A tree form is being maintained

Avoid unnecessary severe cutting.

The shrub may bloom without annual pruning.

When to Prune Spirea

The correct time depends on the type.

Spring-Blooming Spirea

Prune after flowering.

Summer-Blooming Japanese Spirea

Prune in late winter or early spring.

When the type is unknown, note the bloom season before making major cuts.

When to Prune Gardenias

Gardenias usually flower on growth produced before the bloom season.

Prune shortly after the main flowering period when shaping is necessary.

Late pruning can remove developing flower buds.

Remove cold-damaged branches after new growth makes the extent of the damage clear.

When to Prune Camellias

Prune camellias after flowering.

Camellia sasanqua commonly flowers in fall, while Camellia japonica often flowers during winter or early spring.

Wait until the specific plant finishes blooming.

Remove:

• Dead branches
• Crossing growth
• Weak interior stems
• Branches interfering with structures

Camellias naturally grow slowly and may not need frequent pruning.

Avoid Heavy Fall Pruning

Fall is usually not the best time for major shrub pruning.

Heavy pruning may stimulate tender new growth that does not have time to harden before cold weather.

Fall pruning can also remove buds from spring-flowering shrubs.

During fall, limit work to:

• Dead branches
• Broken limbs
• Diseased growth
• Safety hazards
• Small corrections that cannot wait

Save major shaping for the appropriate season.

UGA Extension advises against major pruning during fall or early winter because tender new growth may be damaged by cold weather.

Use Clean, Sharp Tools

Sharp tools make cleaner cuts and reduce torn bark.

Use:

• Hand pruners for small branches
• Loppers for medium branches
• A pruning saw for larger branches
• Hedge shears only for formal hedges

At Bobby & Lynn’s Plant Farm, we prefer dependable bypass pruners such as Corona pruners for clean cuts on live stems.

Clean off soil and plant debris after use.

Disinfect tools when working with a plant showing signs of disease.

UGA Extension recommends sanitizing pruning tools between cuts when disease is suspected.

A common disinfecting method is a solution of one part household bleach to nine parts water. Bleach can corrode metal, so rinse and dry tools afterward.

Make the Cut in the Right Place

For a branch removed completely:

• Cut just outside the branch collar.
• Do not leave a long stub.
• Do not cut flush against the trunk or larger branch.

For a branch being shortened:

• Cut just above a healthy bud or side branch.
• Choose a bud facing the direction you want new growth to move.
• Avoid leaving a long dead tip above the bud.

Do not apply wound paint to ordinary pruning cuts unless a specific situation calls for it.

A properly placed clean cut usually closes more effectively on its own.

What We See at Our Plant Farm

At Bobby & Lynn’s Plant Farm, one of the most common pruning mistakes we see is cutting every shrub in late winter.

That timing works for panicle hydrangeas, smooth hydrangeas, butterfly bushes, Rose of Sharon, and several other summer bloomers.

It can remove most of the flowers from azaleas, forsythia, oakleaf hydrangeas, and traditional bigleaf hydrangeas.

We also see hydrangeas cut to the ground simply because the stems look dead.

Some stems truly are dead. Others are holding flower buds that formed the previous year.

Wait for spring growth before deciding.

Another common issue is choosing a plant that becomes much larger than the space and trying to solve the problem with increasingly severe pruning.

Pruning can improve a shrub. It cannot permanently change its natural mature size.

The easiest shrub to maintain is one that fits the location from the beginning.

Common Pruning Mistakes

Pruning Every Shrub at the Same Time

Different plants have different flowering habits.

Cutting Spring Bloomers During Winter

This removes the buds waiting to open.

Cutting All Hydrangeas to the Ground

Only certain hydrangea types bloom entirely on new wood.

Topping Crape Myrtles

This creates weak shoots and damages natural structure.

Shearing Natural Shrubs Into Tight Balls

This reduces flowers and creates bare interiors.

Removing Too Much at Once

Heavy pruning can stress the plant and trigger weak growth.

Pruning Because the Shrub Looks Dormant

A dormant branch may still contain living buds.

Pruning in Fall

This may stimulate tender growth and remove spring flower buds.

Leaving Long Stubs

Stubs die back and do not close properly.

Cutting Flush Against the Trunk

This damages the branch collar needed for wound closure.

Using Dull Tools

Dull blades crush and tear stems.

Pruning to Solve a Size Mismatch

An oversized shrub may need replacement with a smaller cultivar.

Flowering-Shrub Pruning Checklist

Before making a cut, ask:

• What shrub is this?
• What is the exact cultivar?
• When does it normally bloom?
• Does it flower on old wood, new wood, or both?
• Is the branch dead or merely dormant?
• Is pruning actually needed?
• Is the plant too large for the location?
• Can thinning solve the problem?
• How much has already been removed?
• Will the cut remove flower buds?
• Is the tool sharp?
• Is disease present?
• Should the tool be disinfected?
• Is this a natural shrub or a formal hedge?
• Would gradual rejuvenation be safer?
• Would replacing the plant be more practical?

Frequently Asked Questions

When is the best time to prune flowering shrubs?

Prune spring-flowering shrubs after they bloom.

Prune summer-flowering shrubs in late winter or early spring before new growth begins.

What shrubs should not be pruned in winter?

Avoid major winter pruning of azaleas, forsythia, weigela, oakleaf hydrangeas, traditional bigleaf hydrangeas, spring spirea, and other shrubs that bloom on old wood.

What shrubs can be pruned in late winter?

Panicle hydrangeas, smooth hydrangeas, Rose of Sharon, butterfly bush, crape myrtle, abelia, beautyberry, vitex, and summer-blooming spirea may be pruned before spring growth.

Can dead branches be removed at any time?

Yes.

Dead, broken, diseased, or dangerous branches can be removed whenever they are found.

How do I know whether a shrub blooms on old wood?

Spring-flowering shrubs commonly bloom on old wood.

Confirm the plant name and flowering habit before pruning.

Which hydrangeas bloom on old wood?

Bigleaf, mountain, oakleaf, and climbing hydrangeas commonly bloom on old wood.

Some reblooming bigleaf and mountain hydrangeas bloom on both old and new growth.

Which hydrangeas bloom on new wood?

Panicle and smooth hydrangeas bloom on new wood.

Can I prune Endless Summer Hydrangea in spring?

Remove only clearly dead stems after new growth begins.

Heavy spring pruning may remove the earliest blooms formed on old wood.

Should panicle hydrangeas be cut to the ground?

No.

They can bloom after hard pruning, but cutting them to the ground annually may produce weak stems.

When should azaleas be pruned?

Prune soon after flowering.

Finish major shaping before the plant begins setting next year’s buds.

When should butterfly bushes be cut back?

Prune in late winter or early spring before strong new growth begins.

When should Rose of Sharon be pruned?

Prune in late winter or early spring when shaping or thinning is needed.

When should crape myrtles be pruned?

Prune in late winter only when necessary for structure.

Never top them.

Can overgrown shrubs be cut to the ground?

Some broadleaf shrubs tolerate severe rejuvenation.

Junipers, pines, arborvitae, and many other narrow-leaved evergreens may not regrow from bare old wood.

Identify the plant first.

How much of a shrub can I remove?

For normal pruning, avoid removing more than roughly one-third at one time.

Spread major correction over several seasons when practical.

Is fall a good time to prune shrubs?

Usually not for major pruning.

Fall pruning may remove spring buds and encourage tender new growth before winter.

What to Do Next

Identify the shrub before pruning.

If it blooms in spring, wait until the flowers fade. If it blooms during summer on new growth, prune in late winter or early spring when needed.

For hydrangeas, confirm the species.

Bigleaf, mountain, and oakleaf hydrangeas need cautious pruning because they commonly bloom on old wood. Panicle and smooth hydrangeas bloom on new growth and can be pruned before spring growth begins.

Begin every pruning job by removing dead, damaged, diseased, and crossing branches.

Use thinning cuts to open the plant while preserving its natural form. Avoid repeated shearing unless the plant is intended to be a formal hedge.

Remove no more than necessary.

Pruning should help a shrub remain healthy and attractive. It should not be an annual battle to force a plant into a space it was never meant to occupy.

Read When Is the Best Time to Cut Back Perennials? for guidance on perennial cleanup.

You can also browse our Plant Directory to check pruning time, mature size, bloom season, and care information for individual plants.