Creating a wildlife pond in a small garden

Why a Small Pond Punches Above Its Weight

Ask any countryside gardener what single change brought the most life to their plot and you'll usually get the same answer: a pond. Even a modest one, no bigger than a dining table, becomes the busiest address in the garden. Frogs arrive within a season, dragonflies patrol the surface by midsummer, and hedgehogs will travel a surprising distance for a quiet drink on a dry evening.

The good news is that you don't need an acre of land or a digger. A small, well-placed pond is often better for wildlife than a large, exposed one, because it warms up quickly, shelters easily and fits neatly into the corner of a typical British garden. The trick is to get the details right from the start.

Choosing the Spot

Position is everything, so spend a week or two watching your garden before you dig. You're looking for a spot that gets sun for at least half the day but isn't blasted by it from dawn to dusk. Sun warms the water and encourages the algae-eating and plant life that everything else depends on, while a bit of afternoon shade keeps the pond from cooking in a heatwave.

• Avoid overhanging trees — falling leaves rot down and turn the water sour. If you must go near one, a net in autumn saves a lot of grief.
• Keep it away from the house — a metre or two of distance avoids any damp worries and keeps frog song away from open bedroom windows.
• Choose level ground — a slope means extra digging and a wobbly rim. If your garden slopes, use the spoil to build up the lower edge.
• Think about safety — if small children use the garden, a shallow shelf and a firm mesh cover, or waiting a few years, are both sensible options.

Aim for a finished pond around two metres by one and a half, with a depth of at least 60cm in the middle. That depth keeps frogs safe from frost and gives them somewhere to overwinter without the whole thing freezing solid.

Digging and Lining Without the Fuss

Mark out the shape with a rope or a hose pipe — gentle curves look more natural than a perfect circle or rectangle. Dig down in stages, keeping a shallow shelf about 20cm deep around the edges for marginal plants, then a deeper section in the middle.

Line the hole with a good butyl rubber liner, which lasts decades, or a decent flexible liner if the budget is tight. Old carpet or a layer of sand underneath stops stones puncturing it. Fold the edges over neatly and tuck them under turf or paving so the liner disappears. Fill with rainwater from a water butt if you can — tap water contains nutrients that feed algae, and rainwater gives you a flying start.

Leave the water to settle for a few days before planting, and don't worry if it looks like a muddy puddle at first. It will clear.

Plants That Earn Their Keep

Native plants are the heart of a wildlife pond. They oxygenate the water, provide cover for tadpoles and perches for emerging dragonflies, and they look far better than a bare tub of water. Aim for a mix of oxygenators, marginals and a little floating cover.

• Oxygenators — hornwort and water starwort, sold as bunches, simply dropped in and weighted.
• Marginals — marsh marigold, water forget-me-not, purple loosestrife and flowering rush along the shallow shelf.
• Floating cover — a small native water lily, or frogbit if space is tight, to shade the surface and keep algae in check. Avoid anything too vigorous.
• Edges — let the grass grow a little longer around one side to give amphibians a damp, safe corridor in and out.

Cover roughly a third of the water surface with plants and no more. Any more and you'll spend your summers fishing it out.

Why You Should Skip the Fish

It feels tempting to add a few goldfish, but resist. Fish eat frogspawn, tadpoles and the larvae of dragonflies and damselflies, and they stir up the silt until the water never quite clears. A fish-free pond is a wildlife pond, and it settles into a natural balance far more easily — the frogs and insects do the tidying for you. You'll also save yourself filters, pumps and feeding, which suits most of us just fine.

Don't add frogspawn, either. Frogs are brilliant colonisers and will find a new pond within a year or two, often hopping in from a neighbour's garden. If you build it, they will come.

Wildlife-Friendly Details Worth Getting Right

A pond is only half the habitat. A few small additions turn it into a proper little nature reserve. Build a gentle ramp of stones or a piece of roughened wood at one edge so hedgehogs and other thirsty creatures can climb out if they fall in — a saucer of water at ground level nearby is even better for them. Pile up some logs and stones in a quiet corner as a frog and newt refuge, and leave a few patches of long grass and dead leaves for overwintering insects.

Keep the water topped up with rainwater in dry spells, and never use chemicals anywhere near the pond. Then do the hardest thing of all: leave it alone. A pond that looks slightly untidy, with a bit of blanketweed in spring and brown leaves in autumn, is exactly the pond the wildlife wants. Pull out excess weed by hand in summer, sit back with a cup of tea, and enjoy the best free entertainment in the garden.