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A field journal of theHouse&Hedgehome & garden, kept in ink
Entry 30 · shrub

Cherry laurel

Prunus laurocerasus · Rosaceae
part shadewater every 5 to 30 dayseasycats toxic · dogs toxic
Add to my plants
In brief
Lightpart shade
WaterEvery 5 days in the growing season, every 30 in winter
PetsCats toxic, dogs toxic

Source: Veterinary Poisons Information Service (VPIS), not ASPCA, which has no cherry laurel entry.

Toxic to cats and dogs if chewed. ASPCA has no entry for cherry laurel under any name. The UK's Veterinary Poisons Information Service confirms the leaves and seeds contain cyanogenic glycosides; gastrointestinal upset is the likely outcome of a mouthful, and serious poisoning is uncommon but on record. Treat it as unsafe to chew regardless. Keep it where an animal that eats houseplants cannot reach it, and speak to a vet if one does. In South Africa telephone the Poison Information Helpline on 0861 555 777; in the US, the ASPCA Animal Poison Control Center on (888) 426-4435.

Cherry laurel earns its place in deep shade that few other evergreens will fill, which is the whole reason gardeners plant it under mature trees where a privet or box hedge would thin out and fail. The large, glossy leaves are the giveaway that this is a shade specialist rather than a sun lover pressed into service: bigger leaves catch more of whatever light reaches the ground. It asks for very little once it is in, which is also why an unfed, unwatered hedge in poor soil can still look respectable years later.

Its size is worth planning for before it goes in the ground. Reports of its ultimate height genuinely differ between sources, from around three to four metres up to eight metres or more, which is a wide enough spread that it is worth assuming the larger figure unless you plan to keep it clipped hard every year. A cherry laurel hedge is a long commitment to regular cutting, not a plant that settles into a fixed size on its own the way a smaller shrub might.

Planting a hedge

Plant in the dormant season on reasonably fertile, well-drained ground: October to March in the northern hemisphere, and roughly May to August south of the equator, avoiding frozen or waterlogged soil either way. Give it room from the start rather than planting tightly and expecting to thin later, since a laurel hedge planted too close together struggles for light at the base in exactly the way overcrowded privet does, and the large leaves make a congested hedge look patchy rather than simply dense.

Light

Full sun or partial shade both work, and it is genuinely one of the few hedging shrubs that copes with deep shade, where the leaves grow larger to compensate for the dimmer light.

Water

Water regularly through the first two growing seasons. After that it tolerates dry, ordinary soil reasonably well, though a hedge planted in a hot, exposed spot in its first summer still needs watching rather than left to chance.

Feeding

Cherry laurel is intolerant of heavy fertiliser. A light spring mulch of compost or leafmould is usually enough; pushing it with a strong feed produces soft, late-season growth, and soft growth is exactly what the bacterial shot-hole disease finds easiest to infect.

Pruning and propagation

Prune evergreen hedges in late spring or early summer. Because the leaves are large, cut with secateurs rather than a hedgetrimmer where you can, since slicing through a leaf blade leaves a brown, dead-looking edge that takes weeks to disappear. Avoid pruning in frost or in the last weeks before the cold sets in, since fresh cuts and the soft growth that follows them are the most frost-vulnerable part of the plant.

Semi-ripe cuttings taken from late summer into autumn are the standard way to propagate it, and hardwood cuttings from late autumn to late winter work as well.

Ailments

Bacterial shot-hole is the defining laurel problem: small brown, water-soaked spots that the leaf reacts to by dropping the tissue around them, leaving a ragged hole rather than a clean one. There is no effective spray; the fix is cultural, avoiding overhead watering and easing off on feed, which slows the soft growth the bacterium prefers. Powdery mildew shows as a white, dusty coating, usually on the leaf underside in still, humid weather, and is best left alone rather than pruned hard while it is active.

A note on the leaves themselves, since it comes up often: cherry laurel contains cyanogenic compounds, the same chemical family that gives crushed laurel leaves their faint almond smell. ASPCA carries no rating for this plant, but the UK’s Veterinary Poisons Information Service has confirmed the risk directly. It is not the emergency some old garden folklore suggests, but it is real, and a dog or cat that chews the hedge regularly is worth watching rather than ignoring.

Ailments observed

Holes chewed in the leavesBacterial shot-hole, which starts as small brown spots with a water-soaked edge and drops out of the leaf, leaving a ragged hole. There is no effective chemical treatment. Prune out affected growth, avoid wetting the leaves when you water, and ease off on feeding, since soft growth is the most susceptible.
White powder on the leavesPowdery mildew, most often on the leaf underside in warm, humid, still conditions. Trim off the worst-affected leaves. Avoid a hard prune while it is active, since that adds stress the plant does not need on top of the mildew.
Yellow new leaves at the growing tipChlorosis on a shallow, chalky soil, where the plant cannot take up enough iron even though it otherwise tolerates alkaline ground. Work organic matter into the planting area to buffer the pH, or feed with a chelated iron product made for alkaline soil. This is a soil problem, not a pest or a disease, and will not respond to either.

Questions from the margin

Is cherry laurel poisonous to dogs?

The leaves and seeds contain cyanogenic glycosides, confirmed by the UK's Veterinary Poisons Information Service, though ASPCA carries no entry for it. Most dogs that eat a leaf or two get an upset stomach rather than anything worse, but treat it as unsafe and keep an eye on a dog that chews the hedge.

How fast does cherry laurel grow?

Quickly for a broad-leaved evergreen: figures from different growers' guides range from about 30 cm to 60 cm a year on reasonable soil, which is why it needs at least one full trim a year to stay in bounds.

Why does my laurel hedge have holes in the leaves?

Almost always bacterial shot-hole. Small water-soaked brown spots form first, and the tissue around each one drops out as the leaf grows, leaving a ragged hole rather than a clean one. There is no spray for it; prune out the worst growth and let the plant's own vigour outgrow the rest.

Filed underPlants that forgive a beginner

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