Why a Pond Beats Almost Anything Else You Can Do

If you only make one change to your garden for wildlife this year, make it a pond. Nothing else comes close for the sheer variety of creatures it brings in. A damp hollow the size of a dining table can host frogs, newts, damselflies, hoverflies, hedgehogs stopping for a drink and a procession of birds that will use it as a bath, a larder and a meeting point. Unlike a wildflower meadow, which needs years to settle, or a hedge, which needs a decade to mature, a pond starts working within days of filling. And the reassuring truth is that the wildlife-friendly pond is also the easiest pond to look after. No filters, no pumps, no fish, no fuss.

Choosing the Spot and the Shape

The single most important decision is where the sun falls. Aim for a site that gets sun for at least half the day; a pond in deep shade stays cold and lifeless, and the plants sulk. Avoid placing it directly beneath a large deciduous tree, not because of the leaves (a few are fine) but because the roots will make digging a misery and the canopy will starve the water of light. Some shelter from the prevailing wind helps insects, so a spot with a hedge or fence nearby is ideal.

As for shape, forget the perfect circle. Curved edges that wander in and out create pockets of still water, sheltered corners and varying depths, all of which suit different creatures. If you can, dig one end shallow and the other deeper. A good rule of thumb is a shallow shelf of 10–20cm around much of the edge, a middle zone of around 45cm and a small deeper section of 60–75cm. That deeper bit keeps frogs and newts safe through frost and gives them somewhere to overwinter.

Digging and Lining in a Weekend

Mark out the outline with a hose or a length of rope, then start digging. Keep the turf and topsoil to one side; the turf can go back upside down on the spoil heap, and the topsoil is useful for planting up the edges afterwards. Remove sharp stones and any thick roots from the hole, because these are what puncture liners.

For the lining, a butyl rubber liner is the durable choice, though flexible PVC or even a heavy-duty polythene will do at a push. Buy more than you think you need: measure the longest length and width, then add twice the maximum depth plus a generous 50cm of overlap on every side. Line the hole with a layer of old carpet, sand or a purpose-made underlay to cushion the rubber, then drape the liner in loosely, letting it settle into the contours rather than forcing it. Fill slowly with water and, as the weight takes the liner down, tuck and pleat the edges.

• Two people can dig a 2m x 1.5m pond in a morning.
• Let the filling water stand for a day or two before planting.
• Trim the liner leaving a 20–30cm skirt, then hide it under turf or stones.
• Never use tap water straight from the mains if you can collect rainwater instead.
• Avoid adding fish; they eat everything you are trying to attract.

Planting for Wildlife, Not for Show

Native plants do the heavy lifting. Oxygenators such as hornwort and water starwort live submerged and keep the water clear, while floating plants like water lilies and frogbit shade the surface and reduce algae. Around the margins, plant things that bridge water and land: marsh marigold, water mint, ragged robin, lesser spearwort and flowering rush all cope with wet roots and offer cover for emerging dragonflies. On the shallow shelf, a clump of bogbean or water forget-me-not gives tadpoles somewhere to hide.

Don't overplant. Aim to cover roughly a third of the water surface by midsummer, leaving open areas where birds can bathe and insects can dip. If you have no pond liner to hand, grow a few plants in baskets to keep rampant spreaders in check. And resist the urge to introduce frogspawn from elsewhere; frogs will find you within a season or two, and moving spawn risks spreading disease.

The Maintenance That Isn't Really Maintenance

A well-made wildlife pond more or less looks after itself. Top it up in dry spells with rainwater from a butt, ideally poured gently onto the liner edge rather than straight in. In autumn, fish out a few leaves if they blanket the surface, but leave some; they feed the invertebrates. Once a year, in late summer, thin the plants by hand, pulling out no more than a third at a time and leaving the cuttings on the edge for a day so anything living can crawl back in.

Avoid chemicals, fertiliser run-off and barley straw unless you genuinely have an algae problem. If the water goes green in the first spring, be patient — it is a normal stage of a new pond settling, and the plants will soon outcompete the algae. Blanketweed can be twirled out with a stick.

A Pond for All Seasons

Within weeks you will have water beetles, pond skaters and the first tentative birds. By the following spring, the frog chorus starts, and by summer the air above the water will be busy with damselflies. In winter, when everything else in the garden is sleeping, the pond still draws in thirsty birds and the odd fox. It is, for the money and the effort, the best value a garden can offer. Dig it, fill it, plant it — then mostly leave it alone.