Pruning herbaceous perennials correctly transforms your garden from a one-hit wonder to a perpetual showstopper. Most gardeners hack everything down in autumn, robbing themselves of winter interest whilst harming wildlife.
The secret? Prune strategically in late winter (January to February in the UK) when plants are dormant, preserving seed heads for birds whilst ensuring vigorous spring growth. This comprehensive guide covers when to prune over 30 common perennials, mastering the Chelsea Chop technique, avoiding the six biggest pruning mistakes, and understanding which plants require autumn attention versus those that are best left until spring.
Whether you’re tackling Salvias, ornamental grasses, or ground cover geraniums, you’ll learn the three-group system that makes perennial pruning absolutely foolproof, even if you can’t identify every plant in your border! Let’s get pruning Ninjas!
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Herbaceous perennials can be easily identified by this plant type, which returns year after year, dying back each winter and regenerating in the spring. They put on fresh green vegetative growth each year and then die back underground.
Herbaceous plants usually have a root, bulb, corm or underground storage system that survives throughout the winter.
Herbaceous perennials don’t require the care and attention of annuals or bedding plants, as the majority of them are fully hardy (there are exceptions, as with anything). This means herbaceous perennial plants will happily survive underground during the harsh winter frosts and arise again in the spring to dazzle us with their offerings.
To help you identify herbaceous plants, those that come back each year, I’ve listed below the top 25 or so here in the UK, so you can easily see in your own gardens what will need pruning back each year.
| Latin Name | Pruning Group | Specific Timing | Special Notes |
|---|---|---|---|
| Helenium autumnale | Group 2 – Tall | Late Feb | Chelsea Chop in May for compact growth |
| Salvia nemerosa | Group 2 – Tall | Late Feb | Leave tender varieties (Hot Lips) until April |
| Geranium spp. | Group 1 – Ground | Late Feb | Shear hard after first flush for repeat blooms |
| Miscanthus, Panicum, Calamagrostis | Group 2 – Tall | Late Feb/Early March | Never cut back evergreen grasses (Stipa) |
| Penstemon spp. | Group 2 – Tall | March/April | Borderline hardy – old growth protects crown |
| Sedum spectabile | Group 2 – Tall | Late Feb | Leave seed heads for winter interest |
| Rudbeckia fulgida | Group 2 – Tall | Late Feb | Seed heads feed goldfinches through winter |
| Alchemilla mollis | Group 1 – Ground | After flowering or Feb | Self-seeds prolifically if not deadheaded |
| Stachys byzantina | Group 1 – Ground | Early winter if mushy | Prone to fungus in frost – prune early |
| Monarda didyma | Group 2 – Tall | Late Feb | Prone to mildew – remove diseased foliage immediately |
| Aster novi-belgii | Group 2 – Tall | Late Feb | Chelsea Chop prevents flopping |
| Verbena bonariensis | Group 2 – Tall | Late Feb | Self-seeds generously if left |
| Echinacea purpurea | Group 2 – Tall | Late Feb | Leave for birds, then cut back |
| Phlox paniculata | Group 2 – Tall | Late Feb | Thin in spring to prevent mildew |
| Eryngium spp. | Group 2 – Tall | Late Feb | Stunning winter structure – wait as long as possible |
| Geum spp. | Group 1 – Ground | Late Feb | Deadhead for continuous blooms May-Sept |
| Pulmonaria spp. | Group 1 – Ground | After flowering | Cut back tatty leaves for fresh growth |
| Bergenia cordifolia | Group 3 – Evergreen | Tidy in Feb | Remove frost-damaged leaves only |
| Dryopteris, Athyrium | Group 1 – Ground | Late Feb | Pull away old fronds by hand |
| Polystichum | Group 3 – Evergreen | Light tidy Feb | Remove damaged fronds only |
| Kniphofia uvaria | Group 3 – Evergreen | April (tender) | Old foliage protects crown from frost |
| Astrantia major | Group 1 – Ground | Late Feb | Cut back hard after first flush for repeat |
| Nepeta × faassenii | Group 1 – Ground | After flowering & Feb | Shear back to 10cm for fresh growth |
| Persicaria amplexicaulis | Group 2 – Tall | Late Feb | Vigorous – don’t worry about cutting back |
| Helleborus spp. | Group 3 – Evergreen | Jan/Feb before flowers | Remove old tatty leaves to show flowers |
The key to spotting a herbaceous perennial vs a shrub is that herbaceous plants don’t put on woody growth in their stems like shrubs.
They are easy to spot as the first frosts of winter will turn them brown and crispy. Quite often, beginner gardeners think they are dead, but they are not.
Brown or dried-up herbaceous perennial plants in late autumn and winter are simply dormant.
They keep their energy underground in the crown and root system of the plant. Allowing the vegetative matter to die back once the plant has set seed in summer.
Two examples of herbaceous perennials are the Helenium, which is a typical daisy-like flower, and the banana plant (Musa basjoo), which, surprisingly, isn’t a tree but a herbaceous perennial. The largest herbaceous perennial in the world, growing upwards of 3m each year and dying back!
The best time to prune herbaceous perennials is late winter, from January to February.
Most gardeners have a habit of pruning herbaceous perennials at the end of Autumn. This occurs during the great garden tidy-up at the end of the season when gardeners are frantically trying to tidy up, it seems. I’m not sure what it is with us Brits, but we do tend to love a good clean-up and tidy.
What I find is that you may remove the dried-up stems of herbaceous plants to make the borders look tidier, but you’re left with bare earth and spaces in your garden.
I advocate a different approach to pruning or tidying back herbaceous plants, like those in the Exploding Atom Garden, after winter, around late February here in the UK.
Pruning in late Winter is far more beneficial, both visually and for wildlife. The reason for this is that herbaceous plants such as Salvia, Miscanthus, Geums and Foxgloves act as a really good food source for wildlife during the barren winter months.
Seed heads provide easy snacks, and other insects that take refuge around these plants help keep our wildlife alive during winter when food sources are scarce.
Secondly, the dried-up stature of these plants can look incredibly beautiful during the winter. Grasses with their light brown stems frozen in time and seed heads of taller herbaceous plants like Acanthus can extend interest in the garden.
Now, before you think pruning only happens at winter’s end, there’s another brilliant technique that’ll transform your late-summer borders from floppy disasters into compact stunners. Enter the Chelsea Chop, named after the RHS Chelsea Flower Show, because that’s when we traditionally do it, around late May here in the UK.
The Chelsea Chop is essentially giving your tall perennials a haircut before they flower, cutting them back by about a third to half their height. I know it feels brutal snipping off perfectly good growth, but trust me on this one. What you’re doing is encouraging the plant to bush out rather than grow tall and leggy. The result? Shorter, sturdier plants that don’t need staking, more flowers (because more stems equals more blooms), and a later flowering period that extends your garden’s interest well into September.
I use this technique religiously on plants that have a tendency to flop over. There’s nothing worse than coming back from a weekend away to find your beautiful Phlox face-down in the mud after a summer downpour. The Chelsea Chop prevents exactly that disaster whilst giving you more flowers to boot.
The technique itself couldn’t be simpler.
Around late May or early June, when your perennials have put on most of their vegetative growth but haven’t formed flower buds yet, take sharp secateurs and cut back the stems by about a third. If you’re nervous (and I was when I first tried this), start by just chopping the front half of each clump. This way, the back half flowers at the normal time whilst the front half bushes out and flowers later, effectively doubling your flowering season from the same plant.
Here’s my tried-and-tested approach: I walk around the garden on the Bank Holiday weekend at the end of May with my secateurs, looking for anything that’s already looking a bit leggy or tall.
Plants like Phlox, Heleniums, Sedums, and Asters are prime candidates. I give them a good chop, water them well, and then watch the magic happen over the following weeks.
| Plants Perfect for Chelsea Chop | Plants to NEVER Chelsea Chop | Why It Works/Doesn’t |
|---|---|---|
| Phlox paniculata | Peonies | Late bloomers respond well; early bloomers lose their flowers |
| Heleniums | Delphiniums | Encourages bushier growth and more flower heads |
| Sedums (upright types) | Foxgloves | Prevents flopping in heavy rain or wind |
| Asters | Iris | Delays flowering by 2-3 weeks, extending season |
| Rudbeckia (some varieties) | Aquilegia (Columbine) | Single-flush bloomers won’t flower again if chopped |
| Monarda (Bee Balm) | Early-flowering geraniums | Taller varieties become more manageable |
| Achillea (Yarrow) | Lupins | Reduces need for staking dramatically |
| Solidago (Goldenrod) | Oriental Poppies | More compact form fits better in borders |
Who wants to look at bare soil when you could be looking at arrangements of ghostly sepia-toned herbaceous plants?
Look at how interesting this is in the dead of winter. If it were bare earth, it would look barren. The grasses against the Carpinus tree and crisped-up Heleniums look wonderful and are great for wildlife in the garden. Pruning herbaceous perennials in early autumn can reduce their interest in your garden, and this is why I advocate leaving them until late winter.
When it comes to pruning herbaceous perennials, it’s essential to have sharp, clean, and suitable tools for the job. Using old rusty secateurs or pruning shears will damage your plants and potentially lead to infection and disease.
If your secateurs look old, rusty, or blunt, follow my secateurs sharpening guide here. It’s worthwhile spending 10 minutes cleaning and sharpening them. It will save you time in the garden and protect your plants from awkward rough cuts or being torn at the base.
Pruning herbaceous perennials is super easy. It’s a case of cutting them back down to between 2 and 6 inches from the ground, depending on the size of the plant. For really tall grasses or Banana plants, 6 inches is enough. For a tiny Geum or Geranium, then 2 inches is sufficient.
Take a look at the flower bed below before pruning. See the grasses and other herbaceous perennials that have turned brown over the winter.
With a sharp pair of secateurs or a Japanese scythe, snip back the old growth and compost it. See below for the amount removed and the corresponding height. All neat, clean cuts and the clippings have been composted.
To make it easy for beginner gardeners, I split herbaceous perennials into three main groups to help gardeners know what and when to do. Even if you don’t know the exact name of the plant you’re dealing with this guide should help you to identify the pruning method required.
You’re going to need sharp clean secateurs, gloves and a bucket.
Ground cover plants are relatively easy to maintain. They tend not to look too messy as they are closer to the ground, so as they die back, they are pretty low maintenance. It needs very little pruning back. But sharp secateurs make it easy to cut off the brown bits.
I cut back ground cover herbaceous perennials to 2 inches above the ground, or 5-6cm. You can usually see a crown of green growth just above the soil level. So cut above this.
The issue you may find with ground cover plants is that if there’s a hard frost, the leaves can turn mushy and sometimes grow fungus. This is not good for plant health, so if this is the case, remove them in early winter. Stachys is an excellent example of a plant that needs an earlier prune.
If not, I always leave them and tidy them up at the end of winter, just before spring.
Even plants seemingly surviving the winter need to be cut back to the ground. This is because the old growth will be weak, and you want the plant to send out vigorous new growth. So don’t be tempted to try and salvage this group; be brutal, and you will be rewarded!
Group 2, the taller herbaceous perennials, is, in my humble opinion, probably the most interesting, especially in winter. This group will keep the drama alive in your garden even during those dark, miserable winter days. They are also more likely to have seed heads that provide sustenance for wildlife.
Most people seem eager to cut down this group at the end of Autumn. I affectionately call this group the ‘Brown and Crispy Crew‘.
However, I really do advocate that you leave the ‘Brown & Crispy Crew‘ and see just how effective they are at keeping interest in your borders through the winter. You may even see small birds using them as perches or some insects working away on them throughout the winter.
Pruning this group is super easy. I tend to prune these towards the end of February to ensure that any new early growth has a free run. With a clean, sharp pair of secateurs, you will cut down the ‘brown and crispy crew’ to just above ground level, around 3 inches to 6 inches, 6cm to 12cm.
Some plants, like Penstemons, have delicate crowns, so you may want to leave these for another month or so. In most cases, though, a late February chop is fine.
Plants are tougher than you think, and it also allows you to plan the border for that year by seeing it without distraction. It also means you are able to look at your flower beds and identify any potential issues before spring starts.
With sharp secateurs, cut this group back down to the ground – you can compost the cuttings.
This tall Salvia ‘Blue Enigma’ gets cut right back down to the ground.
This group is probably the easiest to deal with, as all you’re doing is a light tidy-up of any dead or damaged matter. Most of this category falls under ground cover, so any carpet-like plants that keep their colour through the winter or a large portion of the Fern family, fall into this group or anything with a glossy green leaf.
For ferns, all you need to do is selectively remove any leaves or fronds. Berginia only requires a light clear-up. Remove any old, crispy leaves as they appear early in the season, so don’t be too heavy-handed.
With evergreen grasses, such as Stipa gigantea, gently remove any old spent flowers and use secateurs (with gloves, as the leaves are sharp) to trim away any damaged leaves.
With Carex or Helictotrichon grasses, you can run your fingers through the grass and pull out any dead matter.
Evergreen herbaceous perennials only need a light tidy-up in late winter. Pruning should be light touch. When pruning evergreen plants in autumn or winter ,simply cut off with secateurs anything that is:
IFerns can be in Group 1 (deciduous) or Group 3 (Evergreen); if they’re in bad shape, a quick neatening is usually enough, so take them back to the ground. If you’re a bit late in pruning your herbaceous plants, I would advise you to prune out all the dead material still; don’t go so far to the ground.
If you’re pruning later in March or April, avoid severing any new growth. However, in my experience with herbaceous plants, late pruning is often preferable to no pruning at all.
| Month | Tasks | Plants to Tackle | What Not to Do |
|---|---|---|---|
| January | Begin winter pruning if weather permits | Hardy perennials, deciduous ferns | Don’t prune if ground frozen solid |
| February | Main pruning window | All Groups 1 & 2 | Don’t disturb bulbs emerging |
| March | Last chance winter prune; tidy evergreens | Latecomers, Group 3 tidy | Don’t walk on waterlogged soil |
| April | Chelsea Chop prep; protect tender crowns | Penstemons, tender varieties | Don’t prune spring bulbs |
| May | Chelsea Chop tall varieties | Phlox, Asters, Heleniums | Don’t chop early bloomers |
| June | Deadhead first flush; finish Chelsea Chop | Geraniums, Salvias, Delphiniums | Don’t neglect watering after hard pruning |
| July | Regular deadheading; water | All flowering perennials | Don’t let seed heads form on repeat bloomers |
| August | Deadheading continues; cut back straggly growth | Catmint, hardy geraniums | Don’t fertilise (promotes weak growth) |
| September | Reduce deadheading; leave seed heads | Start leaving seed heads for birds | Don’t autumn prune (except diseased plants) |
| October | Leave standing; protect tender crowns | No pruning unless diseased | Don’t cut back – provide wildlife habitat |
| November | Resist tidying urge! | Appreciate winter structure | Don’t prune – worst time of year for it |
| December | Enjoy winter garden | Watch birds on seed heads | Don’t prune – you should be inside with cocoa |
Deadheading is also something that many gardeners often overlook. Deadheading is basically removing spent flowers before they set seed during the spring and summer. This is different from the big prune we do in winter. Think of deadheading as little and often maintenance that tricks your plants into producing more flowers.
Here’s why it works: most perennials are programmed to flower, set seed, then call it a day. By removing the faded flowers before they produce seeds, you’re essentially telling the plant ‘job’s not done yet, mate’ and it responds by making another flush of blooms. It’s botanical trickery at its finest.
I deadhead throughout the growing season, usually whilst I’m having my morning coffee and wandering around the garden. It takes all of five minutes and makes an enormous difference to how long your borders look spectacular. Plants like Salvias, Geraniums, Delphiniums, and Nepeta all respond brilliantly to regular deadheading, often giving you a second or even third flush of flowers right through to October.
The technique is simple: follow the stem down to either the first set of healthy leaves or to where you can see new buds forming, and snip just above that point. For plants with individual flower stems like Delphiniums, cut the whole stem down to the basal foliage (the leaves at ground level). Don’t be shy about it – you’re encouraging new growth, not harming the plant.
Yes, you can! All herbaceous clippings can be composted and should be reused and recycled in the garden. They make excellent woody material for compost bins, especially if you’ve got lots of green matter, such as grass clippings. These herbaceous perennial prunings are known as ‘browns’ for your compost bins. Always aim for a mix of 50% greens (fleshy wet ingredients like kitchen scraps) to 50% browns (like twigs, dried herbaceous perennials and cardboard).
I’ve even used a shredder in wildlife gardens to cut down the herbaceous clippings and then used them as mulch on the borders, meaning nothing goes to waste or landfill.
If you haven’t already considered creating a compost bin, I would urge you to read my speedy guide here. All gardens, no matter what size, can fit a small compost bin to close the loop
Once you’ve done all that hard work, cutting back your perennials, but the job’s not quite finished. This is the perfect time to give your plants a helping hand as they wake up from their winter dormancy. Think of it as laying the breakfast table before your guests arrive – everything’s ready and waiting when they need it.
Once I’ve finished pruning a border, I like to give it a light feed and a good mulch in poor soil areas. I use a balanced organic fertiliser (something like blood, fish and bone) sprinkled around the base of each plant, about a handful per square metre. Don’t go mad with it – herbaceous perennials aren’t particularly hungry plants, and too much nitrogen will give you lots of leafy growth at the expense of flowers. Nobody wants a garden full of green blobs with no blooms.
Then comes the mulch, which is probably the single most useful thing you can do for your borders. I use well-rotted compost or leaf mould, about 5cm deep, spread around (but not touching) the crowns of your perennials. This serves multiple purposes: it suppresses weeds (saving you hours of faff later), retains moisture (meaning less watering in summer), slowly releases nutrients as it breaks down, and protects the soil from heavy rain and temperature fluctuations.
One word of caution, though: don’t pile mulch right up against the stems or crowns of your plants. This is called ‘volcano mulching’ (because it looks like a little volcano around the base), and it’s a recipe for rot and disease. Leave a small gap around each crown so air can circulate. Your plants need to breathe, and smothering them with mulch, no matter how well-intentioned, does more harm than good.”
The quick answer is not very often. Herbaceous perennials are tough plants, and while dormant, their roots, crowns, and bulbs will be well protected from sub-zero weather. These plants are adept at surviving long winters and know the optimal time to pop back up in Spring.
If you’re wondering if you should hold off from pruning as there’s going to be a frost again, my answer is not to worry too much. Pruning back old growth can’t harm herbaceous plants. That’s because the brown and crispy stuff is already dead.
Yes, it will give some protection from sinking frosts, but for the most part, you’ll be fine pruning late winter, even if a March or April frost appears. These plants are tough.
If you’re concerned about Penstemons and other more tender perennials, then why not layer your clippings on top of the crown until springtime? That way, you get the best of both worlds!
It’s never too late to prune plants, but there is a best time vs the most difficult time. The best time to prune herbaceous perennials is late winter, before new growth begins. If you’re in April or May and you still have last year’s dead plant material stuck to them, you can remove it.
The biggest problem with late pruning is that you can’t simply hack the plant back to the ground, as you’ll cut off all the new growth in the process. You’ll need to carefully remove the dead parts bit by bit with secateurs, not the Japanese scythe.
Absolutely, you should! Leaving your herbaceous plants to crisp up during the winter is a vital food source for wildlife and offers protection. Beneficial insects will overwinter in the leaf folds, seed heads, and debris on the bottom of these plants.
Lacewings, ladybirds and other insects will be hibernating or overwintering, so cutting back herbaceous plants in Autumn makes it harder for them to survive.
Leaving herbaceous plants over winter also protects the soil. They act as a protective fleece layer from extreme frost and heavy rainfall. They stop the wind from scraping the soil’s surface and are an all-around great protective layer.
By leaving the herbaceous plants through the winter, you also save yourself time at the end of a busy growing season. Putting off that work of pruning until the end of winter gives you, the gardener, much-needed time to relax!
Q: What if I accidentally cut into new growth whilst pruning? A: Don’t panic. Herbaceous perennials are remarkably forgiving. The plant will simply send up more shoots – you might delay flowering by a week or two, but you won’t kill it.
Q: Can I root the cuttings from Chelsea Chopping? A: Absolutely! Cuttings from plants like Penstemon, Salvia, and Phlox often root readily. Stick them in pots of gritty compost and keep them watered.
Q: My Penstemons died after winter pruning – what went wrong? A: You probably pruned them too early. Penstemons need their old growth to protect the crown through winter. Wait until April when the worst frosts have passed.
Q: Should I prune differently in Scotland versus southern England? A: Yes. Scottish gardeners should wait until March or even April for tender perennials, whilst southern gardeners can start in late January. The key is avoiding pruning during hard frosts.
Q: How do I know if my grasses are evergreen or deciduous? A: If they’ve turned brown and crispy by winter, they’re deciduous (cut back). If they’re still green, they’re evergreen (don’t cut back, just tidy).
| Problem | Likely Cause | Solution |
|---|---|---|
| Plant didn’t regrow after winter pruning | Cut into crown, or plant is tender variety | Wait until May – may send up late shoots. If not, replace plant |
| Stems turning black/rotting after cutting | Blunt tools crushing stems, or cut when too wet | Cut back to healthy tissue with sharp, clean tools |
| No flowers after Chelsea Chop | Wrong plant type, or chopped too late | Let plant grow normally next year, note for future reference |
| Plants flopping over despite Chelsea Chop | Too much nitrogen, or chopped too early | Stake if needed, reduce fertiliser next year |
| New growth damaged during spring pruning | Pruned too late in season | Plant will recover, might flower slightly later this year |
| Mildew appearing after pruning | Tools spread disease, or poor air circulation | Remove affected leaves, improve spacing, disinfect tools between plants |
| Geraniums/Nepeta not flowering again | Not cut back hard enough after first flush | Cut harder next time – right back to basal foliage (5-10cm) |
| Lavender/Santolina died after hard prune | Cut into old woody growth | Replace plant – woody subshrubs won’t regrow from old wood |
| Penstemon died over winter | Pruned too early in autumn | Replace in spring, leave Penstemons until April in future |
| Garden looks bare and boring in winter | Cut everything back in autumn | Leave more plants standing next autumn for winter interest |
| Iris didn’t flower after spring prune | Cut off flower buds when tidying | Wait for next year’s flowers, only tidy Iris after flowering |
| Delphinium flowering poorly after cut-back | Cut back too late, or not fed after pruning | Feed with liquid fertiliser, water well, cut back immediately after flowering in future |
| Accidentally cut plant to ground in growing season | Pruning mistake or confusion about plant type | Water well, feed with liquid fertiliser – it’ll probably recover |
| Spread disease with dirty tools | Failed to disinfect secateurs between plants | Remove all diseased material immediately, disinfect tools, monitor plants closely |
| Compacted wet soil by walking on borders | Pruned when ground was waterlogged | Fork gently when dry to aerate, add organic matter, stay off borders when wet |
Now that you know how and when to prune back herbaceous perennials, why not learn more about how to design your own garden?
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Pruning herbaceous perennials late in the winter is the sensible option for you, the gardener and wildlife. By following this guide, you can easily prune back all plants, even if you don’t know their exact names!
Do you have your own preferred pruning time or method for pruning herbaceous perennials? If so, I’d love to hear from you.
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Happy Gardening!
Lee Burkhill, known as the Garden Ninja, is an award-winning garden designer and horticulturist with over 30 years of gardening experience and 15 years as a professional garden designer. A qualified RHS (Royal Horticultural Society) professional, Lee specialises in sustainable garden design and practical horticultural advice. He designs and presents on BBC1’s Garden Rescue and in leading gardening publications. Lee combines three decades of hands-on gardening knowledge with professional design qualifications to help gardeners create beautiful, functional outdoor spaces.
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Hi garden ninja I have a question on a few herbaceous perennials
The plants I have currently in the border (I intend hopefully to add some more)are coreopsis,osteospernums,salvias,lavandula, antirrhinum s, digitalis,calynopsis,campanula, dianthus,and senetti,I only planted these in the garden early last summer,so I avoided cutting them back in autumn is it alright now to go ahead and cut them back now late February?many thanks
Kind regards mark
Hi Mark,
Thanks for your comment. Yes, if you cut them back now that’s ideal before the new growth. Then they will be good to bloom this year! Happy pruning. Lee!