Most gardens give their best performance for six weeks and then quietly retire for the rest of the year. That need not be the case. Trees and shrubs are the bones of a border, and if you choose them with the calendar in mind you can have something worth stopping for in every month — blossom in April, cool foliage in July, berries in October, and bark that comes into its own when everything else has gone. The trick is to think in layers: trees and shrubs for structure, perennials and bulbs to fill the gaps between them.

Start with Spring Blossom

Spring is the easiest season to get right, but it pays to spread the flowering over eight weeks rather than two. Amelanchier lamarckii is hard to beat for a small garden: frothy white blossom in April, bronze young leaves that turn butter-yellow in autumn, and black berries the birds strip in June. It will reach around 6m in time and takes hard pruning if it outgrows its spot.

Crab apples bring blossom and fruit in one plant. Malus 'Evereste' is compact, disease-resistant and carries a heavy crop of orange-red fruits that hang well into winter. Prunus cerasifera 'Nigra' gives pink flower against dark purple leaves, a useful combination for a border that needs contrast.

Earlier still, Viburnum x bodnantense 'Dawn' flowers on bare wood from November to March with a scent you can detect from the kitchen door. Plant spring blossom where it catches morning sun but is sheltered from late frost — an east-facing wall is the worst place for it, as thawing flowers are damaged more than frozen ones.

Summer Foliage Carries the Show

Once the blossom has gone, leaf colour does the heavy lifting. Purple and gold foliage reads well against green, so pair Cotinus coggygria 'Royal Purple' with the lime-green froth of an elder such as Sambucus nigra 'Black Lace'. Japanese maples are ideal for containers and small courtyards — Acer palmatum 'Sango-kaku' has coral-red young stems that look good even in winter.

Evergreens provide the anchor. Viburnum tinus is unfussy and flowers from late winter, Choisya ternata scents a warm evening, and Fatsia japonica gives bold architectural leaves for a shady corner. A few practical points for the summer months:

• Give newly planted trees a full watering can each week in dry spells for their first two summers.
• Mulch 5–7cm deep with composted bark, keeping it clear of the trunk to avoid rotting the bark.
• Prune early-flowering shrubs straight after flowering, so you do not cut off next year's buds.

Autumn Berries and Blaze

Autumn is where a little planning pays off handsomely. Rowan and whitebeam cultivars are the workhorses: Sorbus 'Joseph Rock' carries amber berries over red and orange leaves, while our native Sorbus aucuparia feeds blackbirds and thrushes for weeks. For a wall or fence, Pyracantha combines evergreen cover with berries, though wear gloves and sleeves — the thorns are unforgiving.

For pure leaf colour, Parrotia persica turns crimson, gold and purple on the same branch, Liquidambar styraciflua is superb on damp soil, and Acer griseum manages both fiery autumn colour and peeling cinnamon bark in winter. Berries crop most heavily in full sun; remember that hollies need both a male and a female plant nearby before you get fruit.

Winter Bark, Form and Scent

Winter is the season most people write off, yet bare branches show structure better than any other time. Betula utilis var. jacquemontii has the whitest bark of any birch — plant three together for impact, and sponge the trunks with water in spring to keep them clean. Prunus serrula offers polished mahogany, and Acer griseum shreds its own bark in curling strips.

For colour, coppice dogwoods and willows hard in March every year or two. Cornus sanguinea 'Midwinter Fire' glows orange at the base and yellow at the tips, and Salix alba var. vitellina gives vivid stems that light up on a grey day. Add scent with Sarcococca confusa, Daphne bholua or Chimonanthus praecox, all of which flower on the coldest days. Low winter sun is your ally — plant colourful bark where the light rakes across it, or against a dark evergreen hedge.

Choosing and Planting for Success

Before you buy, check the eventual height and spread rather than the size in the pot. A tree that reaches 15m will swamp a small plot; Amelanchier, Acer griseum and most crab apples stay manageable. If space is tight, choose a shrub that responds well to hard pruning and treat it as a small tree.

• Bare-root plants, available November to March, establish better and cost far less than containerised stock.
• Dig a hole two to three times the width of the rootball but no deeper than the soil mark, and fork the sides to help roots spread.
• Stake trees over 1.5m with a short stake driven at 45 degrees, and check ties each autumn.
• On heavy clay, plant slightly proud of the surrounding soil and mulch generously; most trees prefer neutral to slightly acid conditions, so improve the ground with well-rotted organic matter rather than digging in fertiliser.

Finally, keep a simple note of what performs in your garden each month. Once you can see the gaps, filling them becomes obvious — and a border that offers blossom, leaf, berry and bark will reward you every week of the year.