Pollarding and Coppicing: When Scotland’s Cutting Window Falls

Cut while the tree is still asleep and before anything is nesting in it. Further north, bud burst runs later than the "late winter, before growth restarts" advice written for the south assumes, but the nesting end of the window does not move with it, so a later spring does not buy as much time as it seems. Pollarding and coppicing are both hard, structural cuts for a few specific plants, not routine pruning.

Two different jobs, not two names for the same thing

Both techniques cut a woody plant back hard and rely on it resprouting from below the cut. Where the cut is made, and why, are different.

Pollarding: a permanent framework above browsing height

Pollarding keeps a tree or shrub smaller than it would grow naturally by cutting new growth back to the same points on a permanent framework of branches. On a shrub that might be one stem cut to a metre high, with a mass of stems growing from the top. On a tree it is usually a trunk carrying three or five main branches, cut back to more or less the same spot each time. Over the years each cut point swells into a knobbly pollard head, and new growth breaks from that same knuckle every year.

Ash, common lime, elm, elder, eucalyptus, London plane, mulberry, oak, box elder (Acer negundo) and tulip tree are the garden species usually listed. Willow, beech, hornbeam and holly are the ones traditionally pollarded on a woodland scale. Eucalyptus, mulberry and tulip tree may be borderline for hardiness in a colder Scottish garden, so check the site before committing a framework to one of them.

Late winter to early spring suits most species. Maples bleed sap heavily if cut in spring, so leave them until summer. Autumn is the least favourable time because decay fungi can enter the cuts, and a wet autumn makes that more likely. Once a pollard is established it is usually cut annually, and at the least every few years, to avoid problems.

A pollard left uncut for years or decades is a different matter. The branches grow heavy and weakly attached, and they can break away in windy weather, which is a bigger risk on an exposed site. Get an arborist's advice before restoring one rather than taking it all back to the old head in one go. Poplar and willow have the weakest wood, so a neglected pollard of either is the likeliest to drop branches.

Coppicing: cutting back to the ground

Coppicing cuts the whole plant back to within 5 to 7.5cm of the ground, or to the previous year's stubs once the base (the stool) is established. It throws up a cluster of new stems rather than a single trunk. It is the technique behind multi-stemmed shrubs, the vivid winter stems of dogwoods and willows, oversized foliage on plants grown for leaf rather than flower, and rejuvenating a shrub that has become leggyDescribes a plant that's grown tall, thin and sparse rather than bushy, usually from too little light or not being pinched out. Full definition → or woody.

Beech, dogwoods, elder, eucalyptus, hazel, hornbeam, lime, ornamental bramble, smoke bush, willow and yew are suited to it in gardens. On a woodland scale the list runs to oak, sweet chestnut, field maple, rowan and alder as well. It only works on plants that resprout readily from a stump, so check a species is one of them before cutting it to the ground; most conifers are not.

February to March, just before growth starts, is the usual window. Dogwoods and willows grown for winter colour are cut later, from late March to mid-April, just as new growth develops. Dogwoods should have been in the ground at least two years and be growing strongly first. A large tree coppiced suddenly for the first time can take two seasons to come back into growth, and mature trees may not regenerate at all, so the technique is best started on young plants. A young stool in Scotland is worth extra patience before its first cut.

On a woodland scale, coppicing usually starts after five to six years of growth, which the Woodland Trust says runs longer in Scotland. After that the cycle depends on the species and what the wood is for: hazel about every 7 years, sweet chestnut about every 15, oak or hornbeam every 15 to 25.

Why the cutting window shifts in Scotland

Dormancy runs from leaf fall until buds break in spring, and bud burst is not set by a date. It depends on enough cold over winter (the chilling period), then enough warmth in spring, with day length a third factor whose weight varies by species. Winter cold and spring warmth arrive at different times across the country, so a date that suits one garden is a poor guide for another.

Timing also shifts by two to three weeks between years, so a framework cut back "before growth restarts" in early March can be weeks too early for the same tree further north or at altitude. A whole pollard head or coppice stool cut while sap is rising loses more to bleeding and stress than a smaller cut would. The reliable check is the plant: finish hard cutting before buds are visibly swelling and showing colour at the tip, whichever month that is in your garden.

Frost timing follows a similar altitude-and-coastal pattern but is not the same measurement; the frost dates page has the regional breakdown.

Nesting birds close the window from the other end

A wild bird's nest is protected under the Wildlife and Countryside Act 1981 while it is in use or being built. It is an offence to intentionally or recklessly damage, destroy or take a nest or egg then, and for Schedule 1 species disturbing a bird on or near an active nest is a separate offence. The Act names no fixed calendar season; it protects a nest whenever one is in use, so an old, vacated nest is not the issue.

In practice that becomes a season. Scottish farm-support rules have set a closed period for trimming hedges and trees on supported land, 1 March to 31 August, with exceptions for road safety and for the side of a hedge next to a field being sown with oilseed rape or grass. It is a condition of support payments, not a law for private gardens, but it marks when hedges and trees are realistically carrying active nests. The Woodland Trust gives October to February as the hedge-cutting season. Treat early March to the end of August as the period to avoid on anything that might hold a nest, and check the whole plant for nests before cutting. That includes the late March to April cut on winter-stem dogwoods and willows, and summer work on maples.

If a nest, egg or young bird is disturbed unintentionally during lawful work that could not reasonably have been avoided, there is a defence, but it is not a reason to skip the check. If an active nest turns up, leave the cut until the birds have fledged.

Permission before the saw

A tree covered by a Tree Preservation Order needs the planning authority's consent before any cutting, lopping, topping or removal under the Town and Country Planning (Scotland) Act 1997. Working on a protected tree without it can mean a fine of up to £20,000 on summary conviction. A gardener cannot tell a TPO from the tree itself, so check with the council's planning department before hard-cutting anything mature or long-established, particularly in a conservation area.

The same consent rules, plus the protections for nesting birds and bat roosts, apply to taking off a single large branch. Removing large tree branches safely covers the cutting technique and when the job needs a professional arborist rather than a garden saw.

Putting the calendar together

From leaf fall (October to November) until buds on that plant start swelling is the dormant window. For many lower, milder, coastal gardens that ends somewhere from February into March, and it can run into April at altitude or further north. The nesting-season closed period starts on 1 March wherever the garden is, so a later bud burst does not buy extra room at that end.

Dormant wood tolerates a hard cut without complaint. A cut made too early risks soft new growth caught by a late frost; a cut made too late risks disturbing a nest, and that should set the later boundary, not "the tree still looks bare."

After the cut

New shoots from a coppice stool are soft and palatable, and browsing by deer, rabbits, hares or livestock can undo a season's regrowth. Fencing the stool or piling cut brash over it for the first couple of growing seasons is usual practice on anything bigger than a token shrub.

Pollards solve the problem from the other direction by putting new growth out of reach. Cut so the regrowth is above the animals that browse locally: about 1.2m for roe deer and sheep, 1.5m for fallow deer, 1.8m for red deer and goats, and 2m or more for large cattle. Red deer are found across most of mainland Scotland, so a garden near open hill ground should lean towards the taller end.

Healthy prunings and coppice brash can go on the compost heap, be shredded for mulchA layer of material spread over the soil around plants to suppress weeds, retain moisture, and improve soil structure as it breaks down. Full definition →, or be left as a loose habitat pile for invertebrates and small wildlife. Burn or bin anything showing disease rather than composting it.

Common questions

Sources