Why Hedgehogs Are Disappearing from British Gardens and How to Help

The first time you hear a hedgehog in the garden it is unmistakable: a slow, rattling rustle through dry leaves at dusk, a sound far too big for the animal making it. For plenty of people who grew up in the countryside, or in a suburban street with long back gardens, that noise has quietly gone.

Hedgehogs are no longer the dependable visitor they were a few decades ago. Their decline has been long and gradual, and it has happened garden by garden, field by field. The encouraging part is that gardens remain one of the few places where an ordinary household can still change the outcome, and the work involved is mostly gentle.

Why Hedgehogs Are Struggling

Hedgehogs are small, slow, nocturnal and entirely dependent on a connected patchwork of habitat. Break that patchwork up and the animals vanish from an area long before the last good garden is gone.

Gardens sealed off from one another

A hedgehog may cover a surprising distance in a single night, moving between several gardens in search of food and mates. A solid panel fence with a concrete gravel board underneath stops it dead. When whole streets are fenced that way, the animals are effectively penned into a single plot with nowhere to go.

Roads and traffic

Any hedgehog crossing a road at night is taking a serious risk. Beyond the obvious, kerbs and steep roadside drainage can trap animals that make it across, and a surprising number of casualties happen on quiet lanes rather than busy main roads.

Chemicals in the border

Slugs, snails, beetles, caterpillars and earthworms make up most of a hedgehog's diet. Anything that wipes out that larder removes the food supply. Slug pellets add a second problem: an animal that eats poisoned slugs and snails takes the poison in too. If you are managing slugs, hand-picking after rain, beer traps sunk into the soil and encouraging birds and frogs are all kinder options.

Tidy gardens and lost nesting sites

Hedgehogs need somewhere dry, quiet and undisturbed to sleep through the day and to hibernate from roughly November to March. Decking laid over bare soil, artificial grass, strimmed verges, leaf-blowers and a compost heap turned over every fortnight all remove the same thing: cover. In the wider countryside, hedgerow removal and clean-farmed field margins have done the equivalent at scale.

Predators and pressure

Where badgers are present in numbers, hedgehogs tend to be scarcer, and that is part of the picture in some parts of the country. Add disease, parasites and mild, wet winters that disturb hibernation, and the species is being squeezed from several directions at once.

What a Hedgehog Actually Needs

Strip away the detail and it comes down to four things. Get all four right and hedgehogs will find you.

• Food — an insect-rich garden, not a pristine one.
• Water — a shallow dish, refreshed daily, all year round.
• Shelter — leaf piles, log stacks, long grass and a purpose-built hedgehog house.
• Routes — gaps and corridors that link your garden to the next one.

Open a Hedgehog Highway

A gap roughly 13cm square — about the size of a CD case — is enough for a hedgehog but too small for most pets. A run of adjoining gardens with linked gaps becomes a genuine network rather than a collection of islands.

1. Walk your boundary at dusk and look for anywhere an animal could already squeeze through.
2. Choose one or two quiet corners, away from paths and patios, and cut a notch out of the bottom of the fence or lift the gravel board.
3. Line a cut gap with a short length of pipe or a hedgehog tunnel if you want it to look deliberate.
4. Keep the gap clear of leaves and growth, and check it after storms.
5. Knock on your neighbours' doors and ask them to do the same. Three or four linked gardens are worth far more than one perfect plot.

If the fence is not yours, ask before cutting. Most people say yes once they hear why.

Make It Wilder, Not Merely Untidy

There is a difference between a garden that is beneficial and one that is simply neglected. Aim for structure: a rough grass margin along a hedge, a pile of prunings left in a corner, a stack of logs with the bark still on, a shallow dish of water at ground level. Native shrubs such as hawthorn, hazel, holly and wild rose give cover and drop the fruit and insects hedgehogs feed on.

A compost heap makes a superb nesting site, but it is also a fork waiting to happen. Before turning it, lift the top layer by hand and look. For the same reason, build bonfires on the day you light them, or move the pile first — a heap left standing for a week is an invitation.

Water, Food and Hidden Hazards

Never put out bread and milk, which makes hedgehogs ill. A saucer of meat-based cat or dog food, or proper hedgehog food, is a sensible supplement — but it is a top-up, not a substitute for a garden full of insects. Water is the more important offering, especially in hot spells and during dry autumns.

Then walk your plot looking for trouble:

• Steep-sided ponds and water butts — add a gently sloping ramp or a half-submerged stone so anything that falls in can climb out.
• Netting, sports nets and pea netting left at ground level, which tangles legs and spines.
• Strimmers and mowers. Check long grass before you cut, and cut from the middle outwards.
• Open drains, steep steps and gaps under decking that lead nowhere.

Knowing When to Step In

A hedgehog out in broad daylight is usually in trouble. So is a small one seen in late autumn, an animal with obvious wounds, or one being bothered by flies. Pick it up wearing gloves, place it in a deep box lined with an old towel, keep it somewhere quiet and warm, offer water in a shallow lid, and ring a local hedgehog rescue or wildlife hospital for advice. Do not attempt to feed milk or keep it as a pet.

A Hedgehog-Friendly Garden in a Weekend

You do not need to rewild the whole plot. Start with the things that take an afternoon:

• Cut one 13cm gap in a boundary fence.
• Put a shallow dish of water on the ground and keep it filled.
• Leave one corner rough over winter — a leaf pile or log stack is enough.
• Stop using slug pellets and insecticides.
• Check the grass before strimming and the bonfire before lighting.

Do those five things and you have already improved your patch more than most. Do them alongside two or three neighbours, and you have built something that lasts.

Photo: katerinavulcova / Pixabay