Pruning Shrubs: Why, When & How to Do It Right

Most shrubs need very little pruning. When they do, knowing when and how to cut keeps them healthy and flowering well.

Why Should You Prune Shrubs?

You might prune a shrub to encourage flowering or fruiting, keep it the right size, rejuvenate an overgrown plant, bring out colorful stems, or encourage some varieties to bloom again.

Most shrubs don't need regular pruning to stay healthy, so prune only when you have a clear purpose in mind. Your reason for pruning shapes every decision that follows.

There are a handful of legitimate reasons to pick up your shears.

✓ Improve flowering or fruiting: Removing old, spent wood redirects the plant's energy into fresh blooms and fruit.

✓ Rejuvenate overgrown plants: Older shrubs can turn woody and unproductive, and selective pruning gives them a second wind.

✓ Control height and spread: Shrubs that crowd a path, block a window, or crowd out their neighbors benefit from careful size management.

✓ Encourage rebloom: Some varieties respond to deadheading or light trimming with a second flush of flowers.

✓ Remove dead or damaged wood: Dead stems are a doorway for disease, so clearing them out promptly protects the rest of the plant.

When Is the Best Time to Prune Shrubs?

The best time to prune shrubs depends on whether your shrub flowers on old wood, meaning last year's growth, or new wood, which means growth from the current season.

Old Wood vs. New Wood: The Key Distinction

Spring-flowering shrubs bloom on old wood and should be pruned right after flowering, or you'll cut off next year's buds before they've had a chance to form. Summer and fall bloomers flower on new wood and can be cut back in early spring instead, before growth starts.

Reblooming Shrubs

A few shrubs bloom on both old and new wood. For these, prune lightly after the first spring bloom. That tidies the plant and sets the stage for a second flush later on.

Special Cases

Dead or damaged wood can come off any time of year, no matter the season. Evergreens like boxwood and arborvitae are best pruned in spring, once the new growth has flushed out.

Pruning shrubs in summer is generally fine for new wood bloomers that have already flowered. Avoid heavy pruning once the hottest part of summer arrives.

If you accidentally prune a spring bloomer in fall or winter, don't panic. The plant will be fine. You'll just miss that one season's flowers, since timing affects blooms and not the plant's survival.

How to Prune Shrubs: Techniques & Best Practices

Good pruning comes down to clean cuts in the right spot and picking the right technique for what you're trying to achieve. Use the right tools and cut just above a healthy bud or branch junction, angling the cut so it heals quickly.

The One-Third Rule

Never remove more than one-third of a shrub's height or branch count in a single session. Go past that, and you risk stressing the plant, triggering weak regrowth, and cutting into next year's flowering.

The one exception is a badly overgrown shrub that needs severe rejuvenation. Even then, it's better to spread the work across two or three years rather than doing it all at once.

The Two Main Pruning Approaches

Most shrub work falls into one of these two camps:

• Heading back (overall cut). Heading back, sometimes called heading cuts, means shortening stems evenly across the shrub to reduce its size and encourage bushier growth. 

What you get is a shorter, bushier shrub, with vigorous new growth pushing out from the large buds just below each cut. Use this approach to control a shrub's size or encourage bushier growth.

• Selective removal (renewal pruning). Selective removal means cutting individual older or weaker stems out entirely at the base, leaving the younger, healthier stems alone. 

New shoots come up from ground level, renewing the plant's structure from the inside out. This one is better suited to rejuvenating old, woody shrubs, keeping a shrub's natural shape while improving airflow and light penetration.

Making a Clean Cut

The way you make each cut matters more than many gardeners realize.

1. Cut just above a healthy bud or branch junction, not in the middle of a bare stem.
2. Near a bud, angle the cut slightly away from it so water runs off instead of pooling on the wound.
3. At a branch junction, cut just outside the collar, the slight swelling where the branch meets the main stem.
4. Steer clear of heavy, leafless wood with no visible buds. Without a bud nearby, the stem is unlikely to regenerate.
5. Skip the wound dressing or sealant. Clean cuts heal faster and are better left alone, and sealers can trap moisture and promote decay.

Deadheading: Pruning for Rebloom

Deadheading means removing spent flowers before they set seed, which is a simple way to coax out a second round of blooms. Snip just below the faded flower head, cutting back to the first pair of healthy leaves or a visible bud. Not every shrub responds to this, but for the ones that do, like some roses and certain hydrangeas, you get a noticeably longer blooming period for very little effort.

The Essential Tools for Shrub Pruning

Sharp, high-quality pruning tools are essential for making clean cuts that heal quickly and reduce disease transmission. 

If you're building a pruning kit or looking for a practical gift, the FELCO 933-1 Gift Set combines three of FELCO's iconic cutting tools for pruning, floral work, and general garden tasks.

Dull or low-quality tools crush and tear plant tissue instead of cutting cleanly, leaving wounds that heal slowly and are more susceptible to disease. Sharp, well-maintained tools help shrubs recover more quickly.

FELCO Bypass Pruners: The Standard for Clean, Precise Cuts

FELCO has earned its reputation as the industry standard among home gardeners and professional horticulturalists alike. Built from hardened steel with replaceable blades, FELCO bypass pruners are the workhorse of shrub pruning, delivering precise cuts on stems up to 1 inch in diameter. 

They work like scissors, with one blade passing by the other for a clean cut that minimizes tissue damage, which makes them the go-to plant pruning shears.

Large hands tend to do well with the FELCO 2, the classic model, or the FELCO 8, which has an angled cutting head for better ergonomics. Medium hands usually prefer the FELCO 6, and smaller hands the FELCO 14.

These pruners hold up consistently across years of use. With replaceable blades, springs, and grips, you'll get years of cleaner cuts and healthier plants from a single pair.

Hedge Shears and Loppers: When and How to Use Them

Sometimes you need the ability to shape a large area quickly. Hedge shears let you trim large areas of foliage evenly, making them ideal for hedges and shaped shrubs. Loppers give you the reach and leverage for thicker branches, roughly 1 to 2 inches in diameter, that bypass pruners can't handle comfortably.

The FELCO 250-63 or FELCO 250-57 hedge shears combine hardened blades with ergonomic handles to reduce fatigue during longer trimming sessions. Like all FELCO cutting tools, they're built for precision, durability, and long-term use with replaceable parts.

FELCO Saws

Some branches are simply too thick for pruners or loppers, and that's when a pruning saw is the right tool for the job.

FELCO saws cut on the pull stroke, giving you more control and less effort working through dense, woody material. Use a pruning saw to remove large, old stems during rejuvenation pruning and to cut away damaged branches close to the base.

The FELCO 602 is the stronger choice for demanding hedge work and thick woody stems. The FELCO 601 suits finer, more precise cuts, where control matters.

Plant-Specific Pruning Guidelines

The basic principles are the same, but every shrub responds differently to pruning. What works for a lilac could set a butterfly bush back by a season. Here's how to prune some of the most common shrubs.

Lilac: Prune Right After Flowering

Lilacs set next year's flower buds almost as soon as this year's blooms fade, so the window closes fast.

Why it needs pruning: Left unpruned, lilacs get tall and leggy, with the blooms retreating further out of reach every year. Regular pruning keeps the plant compact and productive.

Best timing: Right after flowering, typically late spring to early summer.

Technique notes: Remove spent flower heads by cutting just above the first set of leaves. To bring an overgrown lilac back, take out up to one-third of the oldest, thickest stems at the base each year, spread over three years.

Tip: Avoid cutting into thick, leafless wood. Look for visible buds before making any cut.

Forsythia: Prune Once the Yellow Fades

Forsythia's cheerful yellow blooms show up in early spring before the leaves do.

Why it needs pruning: Without it, forsythia grows rapidly into a large, tangled mass. Annual pruning helps it keep a nice shape and pushes out strong new flowering stems.

Best timing: Immediately after flowering, as soon as the last blooms drop.

Technique notes: Remove the oldest, woodiest stems at ground level, then lightly shorten the remaining stems to control the shrub's size. Shearing forsythia into tight geometric shapes strips away most of the flowering wood, so it's best avoided.

Tip: If your forsythia has gotten badly overgrown, a hard rejuvenation prune, cutting everything back to within six inches of the ground, resets the plant completely. You'll lose one season of blooms, but it comes back strong the year after.

Weigela: Prune for Shape and Renewal

Weigela's tubular flowers are popular with pollinators, and a little annual pruning helps keep the blooms coming. 

Why it needs pruning: Left alone, weigela can turn dense and woody in the center over time, which cuts down on airflow and flowering. Pruning opens the plant back up.

Best timing: Right after flowering, in late spring or early summer.

Technique notes: Remove about one-third of the oldest stems at the base, then lightly shorten the remaining stems if you need to reduce the shrub's size. Hard shearing is best avoided.

Tip: Variegated weigela tends to revert to plain green if it isn't pruned regularly. Take out any all-green stems as soon as you spot them to protect the ornamental foliage.

Azalea: Get the Timing Right

Azaleas are especially sensitive to pruning time, so it's important to prune them at the right point in the season.

Why it needs pruning: Most azaleas already have a naturally attractive, rounded form and don't need much. The main reasons to reach for the pruners are dead wood, uneven growth, or rejuvenating an old, overgrown plant.

Best timing: Immediately after flowering, since azaleas start setting next year's buds within weeks of finishing bloom.

Technique notes: For light pruning, remove individual stems just above a healthy leaf node. For rejuvenation, use selective removal to take out the oldest stems at the base. Shearing azaleas into tight shapes works against their natural form.

Tip: Not sure whether a stem is dead or just dormant? Scratch the bark with a thumbnail. Green underneath means it's alive, and brown means it's safe to remove.

Lavender: Prune to Prevent Woodiness

Lavender doesn't fit neatly into the old wood or new wood categories, but it still benefits from a yearly trim.

Why it needs pruning: Left unpruned, lavender turns woody and unproductive from the base. Annual trimming keeps it bushy and productive for longer.

Best timing: Early spring, just as new growth starts showing at the base, or lightly after the first flush of summer flowering.

Technique notes: Cut back by about one-third into the green growth, never into the hard, brown woody base. Lavender can't regenerate from old wood, so cutting too far back can kill the plant.

Tip: In colder climates, hold off on spring pruning until the frost risk has passed. Tender new growth is vulnerable to late frosts.

Butterfly Bush: Prune Hard in Early Spring

Butterfly bush is one of the few shrubs that benefits from a hard annual prune.

Why it needs pruning: It blooms only on growth produced that same season, so a hard prune in spring stimulates vigorous new stems loaded with flower spikes.

Best timing: Early spring, just before or as new growth emerges from the base.

Technique notes: Cut stems back to within 12 to 18 inches of the ground. It feels drastic, but the plant responds fast, and in warmer climates a butterfly bush can shoot up several feet in a single season.

Tip: In colder regions, butterfly bush may die back to the ground over winter. Wait until you see new basal growth before pruning, so you don't cut away stems that are actually still alive.

A Note on Roses and Hydrangeas

Roses and hydrangeas each need a different approach to pruning, and getting the timing wrong is a common source of frustration. 

Roses vary by type, including hybrid tea, climbing, and shrub roses, and each should be pruned differently. Our hydrangeas and rose pruning guide covers the best timing, techniques, and tools in more detail.

Common Pruning Mistakes to Avoid

Even experienced gardeners fall into these traps now and then. Most mistakes won't kill your shrubs. Still, avoiding them means better blooms, healthier growth, and less frustration.

🔺 Pruning without a reason. Cutting without a clear goal stresses the plant, weakens its structure, and reduces flowering.

🔺 Topping, or flat-top cuts. Cutting every stem to the same height without considering buds or branch junctions encourages weak, crowded growth.

🔺 Shearing everything into tight boxes. Geometric shearing works for naturally dense plants like boxwood, but on most flowering shrubs it removes flowering wood and weakens the plant.

🔺 Using dull tools. Dull blades crush and tear plant tissue, leaving wounds that heal more slowly and are more susceptible to disease.

🔺 Pruning at the wrong time. Pruning spring-flowering shrubs too late removes next year's flower buds. The plant will recover, but you'll miss a season of blooms.

🔺 Applying wound sealant. Wound sealants are no longer recommended. They can trap moisture and promote decay, while clean cuts usually heal best on their own.

🔺 Removing too much at once. Removing more than one-third of a shrub in a single session can stress the plant and trigger weak regrowth. Spread heavier pruning over two or three years.

Mastering Shrub Pruning for a Healthier Garden

Shrub pruning gets a lot simpler once you approach it with purpose instead of habit. Match your timing to the shrub's flowering cycle, use the right technique, and keep your tools sharp. Do that consistently, and you'll enjoy healthier shrubs and more reliable flowering for years to come.

Frequently Asked Questions

Can you prune shrubs in fall?

Generally, no. Most spring-flowering shrubs have already set next year's buds by fall, so pruning removes those flowers before they bloom. Dead or storm-damaged wood is the exception, since that can be safely removed at any time.

How do you know if a shrub needs rejuvenation pruning?

Signs that a shrub needs rejuvenation pruning include reduced flowering, a dense outer shell with a bare center, and woody, leggy growth. Remove up to one-third of the oldest stems at the base each year over two or three years.