Oliver Bennett
Why a Pond Is Both Lifeline and Trap
A hedgehog can cover more than a mile in a single night, following the same routes for years, and a garden pond sits squarely on many of those routes. In dry spells a pond is one of the few reliable sources of clean water, and the damp margins around it are alive with beetles, caterpillars, earthworms and slugs — exactly the larder a foraging hog needs. Get the design right and your pond becomes one of the most valuable habitats in the garden.
Get it wrong, though, and it becomes a killing jar. Hedgehogs are surprisingly good swimmers, but they tire quickly and cannot climb smooth, vertical surfaces. A butyl liner, a steep stone wall or a straight edge of decking gives a drowning hog nowhere to grip. It will patrol the edge for hours, scrabbling at nothing, until exhaustion wins. The fix is not to keep hedgehogs away from the water — it is to give them a way in that is also a way out.
Build a Shallow Beach Along One Side
The single best thing you can add to a wildlife pond is a gently sloping shore. Aim for a shelf that is 10–15cm deep and at least 40cm wide, with a gradient a hedgehog can simply walk up. Line it with rounded cobbles or smooth gravel rather than sharp chippings, which trap tiny feet and are painful to cross.
If your pond is already built and the liner rises straight to the bank, you can fake a beach without digging it out. Stack a bank of large flat stones just below the water's surface, building a natural staircase that breaks the surface on the bank. Check that each step is stable and not sitting in deep, loose silt — soft sludge will swallow a hedgehog's legs and undermine its confidence. A wide, pebbly margin that stays damp but not flooded works almost as well as a true shelf and is far easier to retro-fit.
Ramps, Steps and Reliable Escape Routes
Every pond needs at least two escape points, because a panicking hedgehog will swim to the nearest edge rather than search for a way out.
- Wooden ramp: rough-sawn timber is ideal, set at no more than 30 degrees — roughly one unit of height for every two of length. Rest the top lip firmly on the bank and sink the bottom 15cm under the water.
- Grip is everything: nail thin batons across the ramp every 10cm, or wrap it in roofing felt. Bare or painted timber becomes a greasy slide after a week in the water.
- Stone staircase: a corner pile of bricks or flat stones, each step no more than 8cm higher than the last, gives a natural-looking exit that doubles as basking space for dragonflies.
- Anchor it well: a ramp that shifts under a scrambling hedgehog is worse than none. Weight the base with a submerged brick and check it after heavy rain.
Avoid anything plastic, glazed or algae-prone, and never cover a pond with netting in autumn. A hedgehog that goes in under netting has almost no chance of getting out.
Plant Dense Cover Right Up to the Water
Hedgehogs hate crossing open ground, so let vegetation run all the way to the pond edge. A thick, untidy margin gives them the confidence to approach and provides the invertebrates they are hunting.
- Around the pond: bramble, hawthorn, hazel, wild rose, honeysuckle and blackthorn, allowed to grow into a genuine tangle rather than a clipped hedge.
- In the shallows: purple loosestrife, marsh marigold, ragged robin, water mint, soft rush and sedges, which shade the water and shelter emerging insects.
- On the bank: leave long grass and a few nettle patches. They are a hedgehog highway, not a mess.
Put the strimmer away between March and September. Pond margins are where hogs nest, rest and forage, and strimming a bank is one of the most common causes of horrific injuries.
Keep the Water Clean and the Garden Chemical-Free
Hedgehogs are insectivores, so anything that wipes out their food wipes out them. Slug pellets are the worst offender: a hedgehog that eats a slug that has taken a pellet is being poisoned second-hand, and the effects are usually fatal. Avoid pesticides, weedkillers and fertilisers within several metres of the pond, and top the water up with rainwater rather than tap water where you can.
If you feed hedgehogs, offer meaty cat or dog food and a shallow dish of fresh water. Never bread and milk — it causes serious digestive trouble. Dried mealworms should only ever be a rare treat, as a mealworm-heavy diet strips calcium and leads to bone disease. Keep dishes shallow enough that a small hog cannot topple in, and site them well away from the water's edge.
Nesting Spots and a Hedgehog Highway
A pond is only half the picture; hedgehogs also need somewhere dry to sleep and hibernate. A log pile, a heap of autumn leaves, a quiet compost corner or a purpose-built hedgehog house in a sheltered spot facing south or south-east will all be used. Fill a house with dry straw or leaves and leave it undisturbed from October to March.
Finally, make sure hedgehogs can actually reach your garden. Cut a 13cm x 13cm gap at the base of fence panels or gravel boards — the size of a CD case — and encourage neighbours to do the same. A hedgehog that can move freely between gardens will find your pond, drink, forage and move on safely. One that cannot will take its chances on the road instead.
