Few garden visitors lift the spirits like a hedgehog. There is something deeply reassuring about watching one trundle across the lawn at dusk, snuffling through the borders in search of beetles and slugs. Yet these much-loved creatures have suffered badly in recent decades. Changes in farming, tidy suburban gardens and a loss of hedgerows have all chipped away at the habitat they depend on. The good news is that a single garden, managed thoughtfully, can make a genuine difference — and it need not be scruffy or neglected to do so.

Open Up a Hedgehog Highway

Hedgehogs are wanderers. A single animal may cover a mile or more in a night, moving between gardens in search of food and mates. A solid fence or wall around your plot effectively cuts that route in half. The simplest fix is a gap roughly 13cm square — about the size of a CD case — cut into the bottom of a fence panel or dug as a small channel beneath a gate.

Talk to your neighbours about doing the same. Two or three adjoining gardens linked by small gaps quickly become a useful corridor, and the hedgehogs will find them without any encouragement from you. If you have a gravel board along the base of a fence, lifting it slightly at one corner is usually enough. The gap is far too small for a dog or a fox to squeeze through, so there is no need to worry about unwanted visitors.

Leave a Wild Corner

You do not need to let the whole garden go. A patch of long grass behind a shed, a heap of prunings in a shady corner or a small pile of logs left to rot quietly will all be used. Rotting wood is a nursery for the beetles, grubs and slugs that make up much of a hedgehog's diet, and it doubles as shelter.

• Log pile: stack older wood loosely in a shaded spot and leave it undisturbed. Do not use treated timber.
• Leaf pile: a heap of autumn leaves in a quiet corner makes ideal nesting material and a safe place to sleep.
• Long grass: a strip left unmown through summer gives cover and encourages the insects hedgehogs hunt.
• Compost heap: warm and full of invertebrates, but take great care when turning it — always fork gently and check as you go.

A south-facing bank of dry earth or a tangle of brambles is also worth preserving, as it stays warm and dry — exactly what a hedgehog looks for when choosing a spot to hibernate.

Food, Water and the Slug Pellet Problem

The single most helpful thing you can do is to stop using slug pellets. Metaldehyde and ferric phosphate pellets both cause serious harm, either directly or through the poisoned slugs and snails that hedgehogs then eat. A hedgehog that takes in even a small quantity may suffer tremors, lethargy and internal bleeding. Give them up entirely and let the hedgehogs, thrushes, frogs and ground beetles do the work instead.

If you want to supplement natural foraging, offer meat-based cat or dog food in a shallow dish, or a proprietary hedgehog food. Never put out bread or milk — hedgehogs are lactose intolerant and milk will make them ill. Mealworms are fine as an occasional treat, but do not make them the main offering, as a diet heavy in them can weaken bones.

Water matters just as much, particularly in hot, dry spells. A plant saucer sunk into the ground, no more than 2–3cm deep, with a few stones placed inside for footing, gives a safe place to drink. Top it up daily and keep it going all year round.

Provide a Hedgehog House

A purpose-built hedgehog house offers somewhere dry and quiet to shelter during cold snaps, and can be used for hibernation. Position it in a sheltered, shaded spot against a wall, fence or bank, with the entrance facing away from the prevailing wind — south or south-east is usually best. Raise it slightly on a couple of bricks so damp cannot creep in, and cover the roof with a layer of dry leaves or bark.

Once a house is occupied, leave it alone. Disturbing a hibernating hedgehog in winter can be fatal, as it costs the animal precious energy to rouse. Resist the urge to lift the lid between November and March, and check with a torch from a distance if you are curious. If you find a nest of leaves inside, that is a good sign — leave it be.

Seasonal Jobs and Safety Checks

Most hedgehog injuries in gardens come from ordinary tasks done at the wrong moment. A few habits will prevent the worst of them.

• Strimmers and mowers: walk long grass before cutting and start from the middle outwards, giving any animal a chance to escape.
• Bonfires: build the pile on the day you intend to light it, or move it completely first. A heap of wood left standing for a week is a classic hibernation site.
• Netting: keep it at least 30cm above the ground, or peg it down tightly, so hedgehogs cannot become tangled.
• Ponds: leave a gentle ramp or half-submerged stone at one edge so anything that falls in can climb out.
• Drains and steep-sided holes: cover them, or provide an escape route.

Autumn is a vulnerable time. A young hedgehog still out in daylight in late October, weighing less than about 500g, is unlikely to survive the winter without help. If you spot one, pop it in a box with a towel and contact a local wildlife rescue for advice — do not attempt to keep it going yourself over the winter.

None of this requires a scruffy garden or a great deal of money. A gap in a fence, a shallow dish of water and a corner left alone will do more for hedgehogs than any amount of elaborate planting. Once they find your plot, they tend to come back year after year.