Which Hedge to Plant, and How to Get It Right

Evergreen, Deciduous or Marcescent: What a Hedge Does in Winter

The first question isn’t about the species, it’s about what the hedge does once growth stops for the season. Three behaviours exist, and they aren’t equivalent.

An evergreen keeps its foliage all year: yew, holly, cherry laurel, photinia, thuja, Leyland cypress, box. Only this group guarantees a permanently opaque screen, but it’s also the one that takes the most wind, and any dieback shows for all twelve months. A deciduous hedge sheds its leaves for the whole dormant season: it lets the eye through, but also the light, which is sometimes exactly what you want on a boundary exposed to low winter sun.

Between the two sits the marcescent habit, the compromise few people know about. Beech and hornbeam dry their leaves out when growth stops but don’t drop them: they stay attached, russet-coloured, until the new spring growth pushes them off. A clipped beech hedge therefore gives an opaque screen for nearly the whole bad season without being an evergreen, an effect more pronounced in beech than in hornbeam. Marcescence, though, depends on pruning: it’s the young shoots that hold onto the dry foliage, and a beech left unclipped sheds it like any other tree.

That leaves the semi-evergreen habit: California privet (Ligustrum ovalifolium) keeps its foliage through mild winters and drops it as soon as the cold sets in. Don’t rely on it for a permanent screen in a climate with hard winters.

Start From the Job, Never From the Catalogue

A failed hedge is almost always one chosen for how it looks at the garden centre rather than for the job it needs to do. Five uses come up again and again, each with its own trade-offs.

The fast privacy screen, for masking a view within two or three seasons: cherry laurel (40 to 60 cm a year), western red cedar (45 to 60 cm), Leyland cypress (90 cm and more). The trade-off cuts both ways: whatever grows fast doesn’t stop once it reaches the height you wanted, and none of the three regrows from bare wood when it’s time to cut it back.

The formal clipped hedge, for a crisp line and a controlled width: beech, hornbeam, yew, holly, privet and box all take shears well for decades. Yew and box give the densest surfaces; beech and hornbeam are the cheapest, sold bare root by the hundred.

The informal country hedge, several species mixed in a natural habit, cut back every two or three years: hazel, elder, viburnum, dogwood, honeysuckle. This is the arrangement that shelters the most wildlife and asks the least of you, but it needs room: 1.5 to 2 m of ground footprint.

The low border, under 60 cm, decorative and structuring: historically box, nowadays more often Japanese holly or yew kept low.

The windbreak, finally, where opacity is exactly what you don’t want. A solid screen forces wind up and over and creates turbulence just behind it, whereas a hedge that lets 40 to 50% of the airflow through cuts wind speed over ten to twenty times its own height.

Read Your Ground Before Choosing a Species

A species isn’t chosen in the abstract, it’s chosen against the constraints of the site. Four of those constraints rule out candidates more reliably than any sales pitch.

Cold comes first, and it’s measured in degrees, not in countries. Yew and hornbeam hold below -20 °C; beech, holly, box, western red cedar and Leyland cypress between -20 and -15 °C; cherry laurel and photinia between -15 and -10 °C; privet is the first to give up, between -10 and -5 °C. In USDA zones, where each band gives the average annual minimum, zone 5 drops to -29 °C, zone 6 to -23 °C, zone 7 to -18 °C, zone 8 to -12 °C. Compare those figures to the coldest it actually gets where you live: it’s the coldest night of the decade that kills a hedge, not the average winter.

Soil comes next. Chalky, free-draining ground suits yew, beech, hornbeam, holly, privet and box, all of which grow on chalk. It rules out Japanese holly (Ilex crenata), which prefers acid soil, between pH 4.5 and 6.5, and yellows from iron lockout as soon as the pH rises. Heavy, waterlogged winter soil, on the other hand, tips the balance toward hornbeam: the two look almost identical once clipped, but beech hates wet roots where hornbeam thrives.

Shade, always underestimated: yew is the only one that takes deep shade without thinning out, holly and hornbeam tolerate part shade, while photinia, thuja and Leyland cypress turn sparse without sun.

Wind and salt, finally: near the coast, sea spray scorches the foliage of most classic evergreens.

Comparing the Most Widely Planted Species

The table below brings together the numbers that actually decide the outcome: annual growth, height if left unpruned, minimum temperature tolerated, and the one distinguishing trait.

The height column is worth reading twice: almost all of these plants are trees kept artificially short. Beech, hornbeam, yew and holly all exceed twelve metres if you stop pruning, and Leyland cypress passes thirty metres. A hedge isn’t a low-growing plant, it’s a tree under permanent restraint, and that restraint never stops.

Second reading: growth rates are maintenance commitments, not virtues. Over twenty years, the slow grower often costs less than the fast one.

How Many Plants per Metre, and How Many Rows

Spacing is where a decision made too quickly ends up costing the most: once the plants are in the ground, it can’t be corrected.

The benchmark for an ordinary garden hedge, up to two metres tall, is three plants per metre, roughly 33 cm between plants, in a single row. That’s the compromise that closes up the line in three or four seasons without putting the plants in direct competition. To get there faster from young bare-root stock, go up to five per metre, about 20 cm apart, but in a staggered double row so each plant keeps its own share of soil.

For a hedge meant to grow past four metres, use two plants per metre on each of two rows, four in total, with 50 cm between plants. For vigorous conifers, the nursery rule is simple: two plants per metre while the hedge stays under two metres tall, then a spacing equal to a quarter of the final height you’re aiming for. A six-metre screen is therefore planted at 1.5 m intervals: absurdly sparse in year one, obvious by year ten.

Between rows, allow 30 to 45 cm. The principle: slightly tight spacing closes up a hedge faster than wide spacing, but spacing that’s genuinely too tight closes up nothing, it just creates root competition and a base that thins out.

Bare-Root Planting, During Dormancy

The right planting window isn’t a month on the calendar, it’s a state of the plant and a state of the soil: the shrub dormant, leaves down for a deciduous species, growth stopped for an evergreen, and soil that’s neither frozen nor waterlogged. In the northern hemisphere it opens at leaf fall and closes at bud burst; in the southern hemisphere it’s shifted by six months. The marker is the same everywhere: you plant when the plant is asleep and the soil still crumbles under the spade.

It’s during this window, and only during it, that bare-root plants are available. Sold without a root ball, they cost a fraction of a container-grown plant: over twenty metres of hedge, the difference runs into hundreds of euros. In exchange, their roots can’t tolerate drying out, not even for an hour in the wind. If you can’t plant within two days, heel them in, roots in a trench covered with watered soil; they’ll keep for a few weeks that way, never past the point growth resumes. Before planting, soak the roots for an hour in a bucket of water.

Dig a continuous trench rather than a row of individual holes: that’s the difference between roots that spread out sideways and roots that circle inside a compacted hole. Loosen the soil to two spade depths, remove stones and weed rhizomes, work in compost if the soil is poor, but avoid nitrogen fertiliser, which pushes foliage growth ahead of root growth.

Plant at the root collar, firm the soil without compacting it hard, water generously even in cold weather, then mulch. The real test comes at the first dry season: that’s what decides whether the hedge takes, not the cold.

The Case of Box: Box Tree Moth, Box Blight and Replacements

Box remains unmatched for low shapes and tightly clipped volumes, but it faces two enemies that change the calculation.

The box tree moth (Cydalima perspectalis) is a moth whose caterpillars devour the foliage and then the bark. In temperate Europe it completes two to three generations a year, up to four in warmer regions, with a full cycle of 40 to 60 days around 25 °C: waves of attack follow one another without giving the plant time to recover. It overwinters as young caterpillars tucked into a silk cocoon between two leaves, often at the base of the shoots, and tolerates extreme cold. A dense hedge can be stripped to bare stems in a matter of days: monitoring has to be repeated every generation, not once a year.

Box blight (Calonectria pseudonaviculata) causes browning and defoliation in patches. It takes hold in humid weather between 18 and 25 °C, stops above 30 °C, and spreads through splashing, including from watering. Its resistant structures survive up to six years in plant debris: replanting box in the same spot after an outbreak is rarely a good idea.

The replacements deliver the same visual effect. Yew takes tight clipping better than any other conifer and lives for centuries. Japanese holly (Ilex crenata) closely mimics the habit and small leaf of box and escapes box blight, but demands fairly acid soil and yellows on chalk. Box-leaved honeysuckle (Lonicera nitida) gives the same effect much faster, in exchange for two or three trims a year.

If you keep your box, watch the inner foliage, where the caterpillars start, and water at the base rather than over the leaves to avoid spreading spores.

Pruning: Frequency, Shape, and What Never Grows Back

A formal hedge needs one to two prunings a year: a single pass at the end of the growing season is enough to hold a decent line, two passes give a cleaner, denser surface. Informal hedges are happy with a cutback every two or three years.

Shape matters more than frequency. Prune into a tapered pyramid, base wider than top, what English gardeners call the batter. The reason is mechanical: a hedge with vertical sides, or worse, wider at the top than the bottom, shades out its own base. Each year the bottom thins a little more, until you end up with a hedge on stilts that no amount of pruning can fix. The same tapered profile gives a sloped top that doesn’t hold snow, which otherwise spreads and snaps the topmost branches when it piles up on a flat surface.

Then comes the rule that’s most costly to ignore: on almost every conifer, brown, bare wood doesn’t regrow. Cut into the green and the hedge sprouts back; cut into the brown and the scar stays brown for good. That’s true of Leyland cypress, true cypress, and most false cypress. Western red cedar (Thuja plicata) holds onto dormant buds a little longer, which gives some margin, not a guarantee. Yew is the exception: the only hedging conifer that regrows from old wood, it can be renovated in three stages a year apart, the top, then one side, then the other. Broadleaf species, beech, hornbeam, holly, privet, cherry laurel, can also be cut back hard without drama.

One point isn’t negotiable: don’t prune during nesting season, which runs roughly, in both hemispheres, from early spring to late summer.

Distances, Neighbours and Safety

A hedge sits on a boundary, and as such it falls under local rules that no guide can settle on your behalf. What’s certain is that such rules exist almost everywhere and vary enormously: some set a minimum setback, often around a metre for a hedge meant to exceed two metres; others cap the height allowed on the boundary, frequently around two metres, with lower limits facing a street or near a junction; others tie the distance to the final height. Check your local planning rules before buying the plants: moving a hedge of thirty plants two years later isn’t a quick fix, it’s a full project.

Certain species are also regulated: rosaceous plants susceptible to fire blight, hawthorn, pyracantha and cotoneaster in particular, are subject to planting or movement restrictions in some regions, and those rules change over time. Check locally rather than relying on a ready-made list.

Finally, safety. Several of the best hedging species are toxic if ingested, which mainly changes how you handle the prunings. Every part of yew is toxic, including the seed inside the red berry, and it stays toxic once the clippings have dried: yew prunings have killed horses and cattle. Cherry laurel leaves and seeds contain cyanogenic compounds, and holly and privet berries aren’t edible. None of this rules these species out; it just means never leaving a pile of prunings within reach of grazing animals, and teaching children that no berry from an ornamental hedge is safe to taste.

Common pitfalls to avoid

The care sheets to read next

Every plant mentioned has its full sheet: watering, light, soil, pests and a month-by-month calendar.

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