Why frogs and newts earn their place in a British garden

Frogs and newts are among the most rewarding wild neighbours you can encourage. A single common frog will hoover up slugs, beetles and flies through the growing season, while newts patrol the pond for mosquito larvae and other small insects. They also tell you something important: if amphibians are thriving, your garden is likely to be damp, chemical-free and full of hiding places. That is good news for hedgehogs, birds and bees, too.

You do not need a large pond or a rural setting. Even a modest urban garden can support common frogs, smooth newts and palmate newts. The trick is to give them three things: clean water, shallow edges and rough cover nearby. Get those right and you will soon see frogspawn in early spring and newts performing their strange, elegant courtship dances.

Pond basics: size, depth and siting

A wildlife pond can be as small as a buried washing-up bowl, though a 1–2 metre wide pond is easier to keep balanced. Aim for a depth of 60–80 centimetres in the middle so frogs and newts can overwinter in the mud below the frost line. Shallower ponds may freeze solid, which is bad news for hibernating amphibians.

Site the pond where it gets sun for part of the day — amphibians love to warm up — but avoid full shade and heavy leaf fall from overhanging trees. Rainwater is ideal. If you must top up, use harvested rainwater rather than tap water, which can contain chlorine. Add native oxygenators such as hornwort and water starwort, plus a few marginal plants like marsh marigold and water forget-me-not. Avoid invasive species and never introduce fish to a small wildlife pond.

Shallow edges: the warm-up zone and spawning shelf

This is the single most important feature for amphibians. Frogs and newts need water that is only a few centimetres deep, with a gentle slope or a pile of stones leading in and out. Shallow edges warm up quickly in the spring sun, giving spawn and tadpoles the best chance of development. They also let adult frogs and newts bask safely at the water's edge.

If your pond has vertical sides — common with preformed liners — create a ramp using pebbles, a piece of untreated timber or a roll of turf. Build at least one shallow shelf, 0–10 centimetres deep, along one side. Line it with smooth stones and a little gravel so amphibians can grip. Newts will lay their eggs by wrapping them in the leaves of pondweed and other soft plants, so leave plenty of submerged foliage in the shallows. A few floating leaves, such as water lily or frogbit, give tadpoles cover from hungry birds.

Leave the rough grass — and build a few cosy hiding places

Amphibians spend most of the year out of the pond. After spawning, frogs and newts head for damp, shady cover: long grass, log piles, leaf litter, rockeries and compost heaps. If you keep every lawn edge trimmed and every corner tidy, they will have nowhere to go. Leave a patch of rough grass nearby, ideally with native wildflowers such as selfheal, yarrow and birdsfoot trefoil. Let nettles grow in one corner — they are a magnet for insects, which in turn feed frogs and newts.

Add a few cosy retreats:

• A stack of logs with the bark left on.
• A pile of stones with gaps for shelter.
• A small hedge of native shrubs like hawthorn and hazel.

These places stay cool and damp in summer and provide frost-free shelter in winter. If you want to enjoy the pond yourself, place a bench a metre or two back from the edge, so you can watch without casting a shadow over the water. A quiet corner with a mug of tea is one of the best wildlife-watching hides you can have.

Why fish and small ponds don't mix

It is tempting to add a few golden rudd or goldfish, but in a small pond they are disastrous for amphibians. Fish eat frogspawn, tadpoles and newt larvae, and they will quickly strip a pond of the small invertebrates that newts feed on. Even a handful of sticklebacks can clear a generation of tadpoles in days.

If you already have fish, do not despair. You can still encourage amphibians by providing a separate, fish-free pond — even a large tub or half-barrel will do. Alternatively, keep fish numbers low and add dense planting and shallow refuges where tadpoles can hide. But if your aim is frogs and newts, a fish-free pond is always the better choice.

Keeping the pond healthy through the year

Autumn is the time to gently clear excess fallen leaves and silt, but leave a layer of sludge at the bottom for overwintering amphibians and insects. Never empty or scrub the pond in spring, when tadpoles and newt larvae are developing. If you need to remove blanketweed or duckweed, do it by hand and leave it at the pond edge for a day so any trapped creatures can crawl back.

Avoid all pesticides, slug pellets and weedkillers in the garden. Amphibians have permeable skin and are highly sensitive to chemicals. If you use a pond net to remove leaves, check it before tipping anything onto the compost heap. In winter, do not smash ice on the pond — the shock waves can kill hibernating frogs. Instead, place a pan of hot water on the surface to melt a hole for gases to escape. Finally, never move frogs, newts or spawn between ponds, as this can spread disease. Let your garden become a cosy, safe retreat, and the amphibians will find it on their own.