Why berries are the gardener's best winter gift to birds

By late November, most of the insects that fed our summer visitors have vanished, and the birds still with us switch to fruit. A garden with berry-bearing native shrubs stops being a place to pass through and becomes a larder worth defending. The birds that arrive for berries — thrushes, redwings, fieldfares and, in a good year, waxwings — are exactly the ones that struggle most when hard weather sets in.

Native shrubs have a head start on garden-centre exotics. They evolved alongside British wildlife, they flower at the right time for our insects, and their fruit is the right size and ripeness for our birds. Three species do more work than any others in a modest plot: guelder rose, rowan and holly. Plant them well and you can count on berries from September right through to March.

Guelder rose: the damp-loving workhorse

Guelder rose (Viburnum opulus) is a hedgerow native that reaches roughly two to four metres, with maple-like leaves that turn deep crimson in autumn. In June it carries flat lacecap heads of white flowers, and by September those heads have become heavy, drooping clusters of translucent scarlet berries that glow when backlit by a low sun.

Its great virtue is tolerance. It will grow in clay, in damp ground, in partial shade and in a windy corner, though it fruits best with a decent spell of sun. The berries soften and sweeten after the first frosts, so they are often left alone until December, then stripped quickly by blackbirds, song thrushes and redwings.

• Plant it in a hedge or at the back of a damp border, where its natural suckering habit can fill gaps.
• Prune lightly after flowering rather than clipping hard every year — the flowers and berries form on older wood.
• Pair it with a second plant nearby for better pollination and a heavier crop.

Rowan: the waxwing magnet

Rowan, or mountain ash (Sorbus aucuparia), is a small tree rather than a shrub, usually reaching six to ten metres, with upright forms that suit a narrow garden. It is unfussy about soil, happy on thin acid ground and in exposed sites, and gives three seasons of value: creamy spring blossom, fiery autumn foliage and dense trusses of orange-red berries.

Those berries are the reason a rowan is worth its space. They ripen early and are taken eagerly by mistle thrushes, fieldfares and redwings, with blackbirds clearing the last of them. In irruption winters, when Scandinavian waxwings cross the North Sea in numbers, a fruiting rowan is one of the first trees they seek out — especially in eastern and northern Britain.

Choose a tree carefully, because a rowan planted close to a path will drop fruit onto it. Give it at least four metres from a wall or boundary, and plant bare-root between November and March while the tree is dormant.

Holly: berries that last until spring

Holly (Ilex aquifolium) is slow, dense and evergreen, growing five to ten metres over many years and tolerating shade that would defeat most fruiting plants. It is also dioecious, which means a female plant needs a male within roughly a hundred metres — usually a neighbouring hedge is enough — to set berries at all.

Those berries ripen in October and hang on stubbornly through the worst of the winter, which makes holly the insurance policy of a berry garden. Mistle thrushes will hold a fruiting tree as a winter territory and see off all comers. The prickly foliage is just as important as the fruit: it gives blackbirds, robins and dunnocks somewhere safe to roost and nest, and the leaves feed the caterpillars of the holly blue butterfly.

Holly resents waterlogged ground, so plant it on a slight mound in heavy clay and keep it well watered for its first two summers. If you want berries for cutting, prune in midwinter rather than autumn, and always leave plenty on the tree.

Planting and aftercare that makes the difference

Berries are the reward for getting the basics right. Work through these in order and you will not go far wrong:

• Plant bare-root from November to March, when the ground is workable and not frozen. Container-grown plants can go in at any time if you water them faithfully.
• Improve the soil with two or three spadefuls of garden compost per planting hole, but skip fertiliser — too much nitrogen gives you leaves instead of fruit.
• Space a berry hedge at roughly 1.5 to 2 metres between plants, and specimen shrubs at 3 to 4 metres.
• Mulch 5 to 8 centimetres deep after planting, keeping it clear of the stem, and water thoroughly for the first two growing seasons.
• Leave the hedge trimmer alone in late summer. Cutting back flowering wood in July or August removes the berries before they form.
• Never trim hedges between March and August, when nesting birds are using them.

Add a shallow dish of water at ground level and a patch of leaf litter, and your berry border becomes a complete winter resource rather than a drive-through snack bar.

Layering your berry harvest through the winter

One species alone gives you a few hectic weeks. A mixture spreads the food across the whole winter, so there is always something worth visiting. Rowan fruits first, guelder rose follows into the new year, and holly holds the line into March when nothing else is left.

Fill the gaps with other natives: hawthorn and blackthorn carry haws and sloes into November, elder and ivy fruit late and are stripped by the end of January, honeysuckle and dog rose add smaller berries in autumn, and spindle turns a startling pink in October. Even a single guelder rose in a damp corner will bring in more birds than a garden twice the size planted with nothing at all.