Why the song thrush needs a helping hand

The song thrush is one of our most rewarding garden birds. That speckled breast, the habit of smashing snails against a favourite stone, and a song that repeats each phrase two or three times over before moving on — it is a bird that settles in and makes itself at home once the conditions suit it. Unfortunately, those conditions are growing rarer. Since the 1970s, song thrush numbers across the UK have fallen steeply, largely because of changes in farmland, wetter winters, and the tidying-up of gardens.

The good news is that a song thrush needs surprisingly little: damp ground with worms and snails, dense thorny cover for nesting, and a supply of berries that carries it from late summer right through to spring. Plant the right hedge, and you can supply all three.

Rowan: the early autumn larder

Rowan, our native Sorbus aucuparia, is the ideal first choice for a small garden. It stays compact, copes with most soils, tolerates wind and even light shade, and produces generous clusters of scarlet berries that ripen from late August into September. Thrushes will strip a rowan in a matter of days — a flock can clear a whole tree in a fortnight — which feels disappointing but is exactly the point. That fruit arrives at a crucial moment, when birds are moulting and building reserves before winter.

Because the crop disappears so fast, plant rowan as part of a sequence rather than as your only berrying tree. One rowan, one hawthorn and a patch of ivy will feed thrushes from September to April with barely a gap.

Hawthorn: thorns, haws and nesting cover

Crataegus monogyna is the backbone of any wildlife hedge. Its haws hang on far longer than rowan berries and soften and sweeten as the months pass, so thrushes work through them from October into February, often after a hard frost has mellowed the fruit. Just as importantly, hawthorn makes the sort of dense, prickly tangle that song thrushes choose for nesting: deep enough to hide a nest of four or five speckled eggs from magpies and cats.

Plant bare-root hawthorn between November and March, 30–45cm apart if you want a quick, thick hedge, and let it reach at least 1.5m tall if space allows. Resist the temptation to cut it back hard and often. A hedge trimmed every winter will carry few haws and offer little shelter. Instead, trim lightly, or cut just one section each year on a three-year rotation, and always avoid cutting between March and August when nests are active.

Ivy: winter shelter and the last berries of the year

Ivy is the most underrated plant in British wildlife gardening. Hedera helix flowers late in the year, providing nectar for bees and hoverflies well into autumn, and its berries ripen in late winter and early spring — precisely when almost nothing else is fruiting. Song thrushes, blackcaps and mistle thrushes will all feed on them in February and March.

Ivy is also exceptional nesting and roosting cover, thick enough to keep out rain and cold. Let a generous patch climb a fence, wall or old tree, and leave it alone. If it must be cut back, do it in late winter once the berries have been taken, before birds begin nesting in earnest.

Small touches that make a big difference

• Keep the soil damp and mulched. Leaf mould, compost and undisturbed ground hold the worms and snails a thrush depends on. Leave a rough patch at the back of the border rather than digging it all over.
• Skip slug pellets altogether. A song thrush eats a remarkable number of snails and slugs, and poisoned molluscs poison the birds that eat them.
• Leave windfall apples on the ground in autumn and early winter. They are a favourite food and cost you nothing.
• Keep a flat stone in a quiet corner. Thrushes use a favourite anvil to break open snail shells, and broken shells beneath it are a sign you have succeeded.
• Provide shallow water and clean the dish regularly — thrushes bathe and drink daily.

Planting notes that pay off later

Bare-root plants are cheaper, establish faster and are available from November to March while they are dormant. Water new hedging well through its first two summers, mulch around the base to keep weeds down, and guard against rabbits if you need to. Rowan and hawthorn are happy in sun or light shade; ivy will cope with heavy shade where little else grows.

You will not need to wait long. A young hawthorn hedge can hold a song thrush nest within three or four years, and rowan berries often appear in the same season it goes in. Give the hedge room to grow a little wilder than you might otherwise choose, and the repeated phrases of a thrush singing from the top of it will tell you plainly that the plan has worked.