Why Shade Is an Advantage, Not a Problem

Many gardeners assume a wildlife pond needs full sun. In truth, a pond tucked into dappled shade is often richer and far easier to live with. Cool water holds oxygen better, blanketweed and green water are far less aggressive, and the leaf litter that drifts in feeds the tiny invertebrates that tadpoles graze on. Frogs, toads and newts all breed happily in shaded water, and great crested newts often favour ponds ringed by scrub and trees.

You do not need much space. A pond of roughly 1.5 metres by 2 metres, with a deep point of 60 to 80 centimetres, will support a startling amount of life. What matters far more than size is the shape: soft edges, shallow margins and one continuous gentle slope that lets creatures climb in and out safely.

Choosing the Spot and Digging the Hole

Pick a place you can see from a window, otherwise you will miss the best of it. Partial shade is ideal, with a few hours of dappled light filtering through. Deep, dry shade beneath dense conifers, or the bone-dry strip hard against a house wall, will make planting difficult.

Keep a good distance from established trees. Roots travel well beyond the canopy, so stay at least two to three metres from the trunk of a mature oak or willow, and further from poplar or leyland cypress. Avoid the drip line of a downpipe and anywhere that already floods in winter.

Mark the outline with a rope or hosepipe, then dig. Aim for:

• A deepest section of 60 to 80 cm, so frogs can overwinter in the mud below the frost line.
• A shallow shelf at 20 to 25 cm for marginal plants in baskets.
• An irregular outline, with one or two bays and a promontory, so edges are long and varied.
• Turf stacked to one side, grass side down, to use later for hiding the liner edge.

Check the level across the top as you go. A pond that looks level but is not will show a bare rim of liner on one side.

The Gentle Slope That Saves Lives

This is the single most important feature. A pond with vertical sides is a trap. Hedgehogs, fledgling birds, voles and amphibians all drown in them. At one end, grade the excavation into a long, shallow ramp of about one in four, running from dry ground down to the deep water. Roughen the finished surface with a strip of turf laid upside down, or a scattering of rounded pebbles, so wet feet find grip.

Line the hole with a butyl or EPDM liner over a protective underlay of old carpet, sand or geotextile. Leave plenty of overlap, then tuck the edges into a shallow trench and backfill with soil and the saved turf, so no black rubber shows. A flat stone or a weathered log laid from the bank into the water gives birds, hedgehogs and drinking bees a safe landing stage.

Fill with rainwater from a butt wherever possible. Tap water carries nutrients and chlorine; if you must use it, let it stand for a few days first. Finish with a beach of gravel just below the surface at the top of the slope, and never add fish, which will clear every tadpole in the pond.

Native Plants That Thrive in Shade

Plant in late spring or early summer, in aquatic baskets filled with loam rather than compost, which leaks nutrients and fuels algae. Good shade-tolerant natives include:

• Marginals: marsh marigold, water avens, ragged robin, soft rush, pendulous sedge, brooklime and water forget-me-not.
• Oxygenators: hornwort and water starwort, both content in low light.
• Floating and edge cover: lesser spearwort and a little curled pondweed, plus native ferns and wild garlic nearby.

Leave at least half the water surface clear. Avoid invasive non-natives such as New Zealand pygmyweed, water fern and parrot's feather, which can smother a small pond within a season.

What Will Move In

Be patient. A new pond often looks lifeless for a few weeks, then arrives all at once. Expect common frogs first, then smooth and palmate newts, pond skaters, backswimmers, water beetles and clouds of midges that feed pipistrelle bats at dusk. Damselflies and dragonflies will hunt along the hedge line, and birds will use the gravel beach for bathing.

Great crested newts are protected by law. If you find them, enjoy them from a distance, avoid disturbing the pond between March and September, and take advice before any work.

Care Through the Year

Autumn is the busy season. Stretch a net over the water while leaves fall, then remove it, or a shaded pond will silt up and turn soupy. Top up in dry spells with rainwater only.

In spring, resist the urge to empty and scrub. That is precisely when frogs, toads and newts are breeding, and a clean pond is a dead pond. Instead, thin oxygenators in late summer if they cover more than half the surface, lift and divide marginals every few years, and leave the surrounding grass long, with a log pile or two. Never use pesticides or fertiliser near the water, and never move frogspawn between ponds, which spreads disease. Do very little, and the pond will do the rest.