How to Make a Hedgehog-Friendly Garden in Autumn: A Checklist

By the time the first cold mornings arrive, a hedgehog has a lot on its plate. It needs to build up enough fat to see it through hibernation, find a dry place to sleep through the worst of the weather, and do both in a landscape of tidy fences, paved front gardens and strimmers. Autumn is when those plans either come together or fall apart — and much of the help a hedgehog needs happens to be things you were going to do anyway, just in a different order.

Here's what to prioritise between now and the first hard frost.

Why autumn matters more than any other season

Hedgehogs usually hibernate from around November to March, though mild winters mean they wake and shuffle about in search of food. To go into hibernation safely, a hedgehog needs a good layer of fat and a well-built nest. Adults that have fed well through summer stand a decent chance; late-born hoglets and animals that have had a lean few months often don't.

The weeks from September to November are the ones that count. A garden with a bit of mess, clean water and a gap in the fence is genuinely useful at this time of year. A garden stripped back to bare soil, sprayed and sealed isn't.

Leave the leaves: nests, piles and quiet corners

Hedgehogs hibernate in a nest called a hibernaculum: a ball of leaves, moss, grass and twigs roughly the size of a football, usually tucked under a hedge, behind a shed, beneath a deck or among logs. You can't make a hedgehog move in, but you can leave plenty of building material lying about and a few sheltered spots to put it in.

Leaf piles that actually get used

Rather than bagging every leaf for the council, rake them into a corner behind a shrub, under a hedge or along a fence line. Aim for a heap the size of a wheelbarrow or bigger, sitting on soil rather than paving, with a few twigs mixed through so it doesn't compact into a soggy slab. Don't clear it away in February — nests are sometimes occupied until April, and hedgehogs waking in spring appreciate the cover.

Log piles and compost heaps

A stack of logs with leaf litter and dead stems at the base makes an excellent hibernation spot, and so does a compost heap. Both need careful handling from now on: fork compost gently from the sides, and leave the bottom layer of a log pile undisturbed.

Open up a hedgehog highway

A single garden, however good, is a small territory. Hedgehogs can cover a kilometre or more in a night looking for food, and they need to pass between gardens to do it. A 13cm square gap at the bottom of a fence — about the size of a CD case — is all it takes, and it's a ten-minute job with a saw or a drill.

• Cut or widen a gap at the base of a fence panel, or lift a gravel board slightly.
• Leave room under gates and at the foot of brick walls where a brick has worked loose.
• Check existing gaps are clear of leaves, stones and plant pots.
• Talk to neighbours on both sides so the gaps line up into a route rather than a dead end.

If you'd rather it looked deliberate, a short length of pipe or a purpose-made hedgehog highway ring set into the gap keeps the hole open and tidy.

Food, water and what to leave out

Water is the simplest thing you can provide and the one most often forgotten. A shallow dish at ground level, refilled daily, helps hedgehogs through dry autumn spells and mild winter nights when they wake and wander. If you have a pond, make sure there's a way out — a gently sloping edge, a ramp of stone, or a piece of rough wood reaching from the water to the bank.

Supplementary food helps hedgehogs put on weight before hibernation. Meat-based cat or dog food (not fish, not gravy), cat biscuits or purpose-made hedgehog food all work well. Offer it after dusk in a shallow dish and clear leftovers in the morning. Never put out milk or bread: hedgehogs are lactose intolerant, and bread fills them up without feeding them. Mealworms are fine occasionally, but not as a staple.

What you don't put out matters just as much. Slug pellets, insect sprays and weedkillers cut down the invertebrates hedgehogs live on, and some cause harm to animals that eat poisoned slugs or insects. If slugs are a problem, hand-picking after dark and barrier methods such as copper tape or wool pellets are the safer options.

Autumn jobs that need a second look

Most autumn gardening is harmless, but a few jobs have a habit of catching hedgehogs out.

Bonfires

A pile of wood left standing for a week is a five-star hedgehog bed. Build the fire on the day you plan to light it, or lift the whole pile and check underneath with a torch and gloves before you strike a match.

Strimmers and mowers

Long grass is prime nesting cover. Walk the area first, and if you're strimming near a hedge, compost heap or dense border, go slowly and check as you go.

Netting and open drains

Keep pea netting and fruit cage netting lifted well clear of the ground, and store sports nets off the grass. Cover open drains, or leave a rough ramp inside so anything that falls in can climb back out.

Your autumn hedgehog checklist

1. Rake leaves into a corner instead of binning them.
2. Leave one patch of long grass or wild border uncut.
3. Build a log pile with leaf litter at the base.
4. Cut a 13cm gap in the fence and keep it clear.
5. Put out a shallow dish of water and refresh it daily.
6. Feed meat-based cat or dog food after dusk if you want to supplement.
7. Stop using slug pellets and insect sprays.
8. Check bonfires, compost heaps and long grass before working near them.
9. Lift netting off the ground and cover open drains.
10. Talk to at least one neighbour about linking gardens.

Keep it going through winter

Once the cold sets in, most of the work is done: the piles are built, the gaps are open, the water dish is in place. Keep topping it up on mild days, and carry on feeding on dry nights for as long as hedgehogs are visiting. They wake for short spells in winter, so a reliable food source nearby is worth having.

If you see a hedgehog out in daylight, particularly a small one, don't assume it's fine. Hedgehogs are nocturnal, so daytime activity usually means something is wrong. Put it in a box lined with a towel, offer water and a little meaty cat food, keep the box somewhere cool and quiet, and ring a local hedgehog rescue or the British Hedgehog Preservation Society for advice rather than trying to sort it out yourself.

And if you only manage one thing this autumn, make it the leaf pile. It costs nothing, takes twenty minutes, and it may be the difference between a hedgehog sleeping soundly until spring and not making it at all.

Photo: Alexas Fotos / Pexels