Why a Pond Beats Almost Anything Else You Can Do

Of all the improvements you can make to a garden, few repay you as generously as a pond. Even a modest one — a metre and a half across is plenty — becomes the liveliest corner of the plot within a single season. Water is the habitat our countryside has lost most of, so any garden pond, however small, is genuinely useful rather than merely decorative.

The arrivals begin almost immediately. Water beetles, pond skaters and whirligig beetles turn up as if from nowhere, often carried in on the feet of visiting birds. Frogs and toads follow, then smooth newts. Dragonflies and damselflies patrol above the surface, hunting midges and laying eggs among the underwater stems. Thirsty birds — sparrows, blue tits, blackbirds — drop in to drink and bathe, and hedgehogs will visit at dusk.

There is a gentler reward too. A pond gives you a legitimate reason to sit still for twenty minutes with a mug of tea, watching nothing much happen. That is slow living at its most practical.

Choosing the Right Spot

Position matters more than size. Aim for a spot that catches sun for part of the day and shade for the rest — roughly six hours of sunlight is about right. Full sun encourages algae and warms the water uncomfortably in a hot spell, while deep shade suppresses the plants that keep the water clear and the larvae fed.

• Away from trees: fallen leaves rot down and release nutrients, which feed algae rather than wildlife.
• Level ground: the liner needs an even edge so the water sits straight and doesn't spill.
• Visible from a window or a bench: you'll watch it far more often, and notice problems early.
• Clear of a downpipe: unless you fancy it being scoured out in a storm.

Think about access, too. A pond ringed with gravel or decking is a wall to a frog. Leave a rough edge of grass, stones or logs so creatures can climb in and out, and so birds have somewhere safe to land and sip.

Digging, Lining and Filling

Mark out a soft curve with a rope or hosepipe — irregular edges look far more natural than a perfect circle. Lift the turf and stack it nearby; it makes a useful, wildlife-friendly edging when replaced upside down.

Dig to a depth of about 60 to 80 centimetres at the centre, which gives creatures somewhere to retreat in winter and in drought. Around the rim, cut shallow shelves roughly 20 to 30 centimetres deep to stand marginal plants on. Remove any sharp stones, then line the hollow with sand, old carpet or a purpose-made underlay before laying butyl liner. Buy a piece at least twice the maximum depth plus half a metre of overlap all round; being short here is a false economy.

Fill with rainwater from a butt if you can, as tap water carries nutrients and chlorine. If tap water is all you have, let it stand for a few days before planting. Then step back and leave it to settle — a newly filled pond looks alarmingly bare, and it will not stay that way for long.

Planting for Wildlife, Not Just Looks

Native plants are the whole point: our insects and amphibians evolved alongside them. Aim to cover a third to a half of the water's surface, and choose from each of these groups.

• Marginals for the shelves: marsh marigold, water forget-me-not, water mint, ragged robin, lesser spearwort and purple loosestrife.
• Oxygenators for the depths: hornwort, common water starwort and water milfoil, which keep the water clear and shelter tadpoles.
• Floaters for shade: frogbit, or a white water lily if your pond is generous, to limit algae naturally.
• Edge plants for cover: yellow flag iris — handsome, but keep it in a basket, as it spreads.

Avoid the invasive thugs such as floating pennywort, New Zealand pygmyweed, parrot's feather and water fern. They are illegal to plant in the wild and will smother a small pond in a season. Never take plants from the wild, and never tip pond waste into a stream or river.

Letting the Wildlife Find You

Resist the urge to stock the pond. Fish eat tadpoles, larvae and almost everything else, so a wildlife pond is better without them. Equally, don't move frogspawn in from another pond — amphibian diseases spread that way, and frogs will find you on their own within a year or two.

What genuinely helps is a little rough architecture around the edges:

• A ramp: a piece of weathered timber or a gentle stone slope angled into the water, so hedgehogs and frogs can climb out rather than drown.
• A log pile: damp wood nearby shelters newts, beetles and overwintering frogs.
• A shallow beach: one gently sloping end is where frogs will spawn and birds will bathe.

Then simply wait. Nature is remarkably good at filling a vacancy, provided you have left the door open.

Gentle Care Through the Year

A wildlife pond wants less attention than a garden pond, not more. Top up in dry spells with rainwater rather than tap water, and leave the water level alone otherwise. In autumn, net out some — not all — of the fallen leaves, since a little leaf litter is a larder for invertebrates.

If blanketweed takes hold, lift it out by hand with a stick and lay it on the edge for a day so any trapped creatures can crawl back in. Avoid chemicals entirely, and keep fertiliser and lawn weedkiller well away from the pond's edge. Leave the grass around it longer, cut only once or twice a year, and resist tidying the margins in winter — that tangle is exactly where frogs and newts spend the cold months.

Do this, and by next spring you will have a corner of the garden that hums, croaks and shimmers with life — a small patch of countryside you can sit beside, quietly, for years.