Start with the Soil, Not the Plants

Before you spend a penny on plants, spend half an hour with a fork. The single biggest reason borders become high-maintenance is poor soil structure, which forces you to water, feed and mollycoddle plants that would otherwise fend for themselves. Fork over the top 20–30cm, break up any panning, and work in two or three barrowloads of well-rotted manure or garden compost per square metre. On heavy clay, add grit as well; on sandy soil, compost is your best friend because it holds moisture like a sponge.

If your border sits against a wall or fence, remember that the soil there will be dry and depleted. Dig in extra organic matter and choose plants that tolerate root competition. Once established, a well-prepared border needs perhaps one deep watering a fortnight in a hot spell, rather than a daily sprinkle with a can.

Choose Long-Lived Perennials That Earn Their Keep

The backbone of a low-maintenance border is perennials that bulk up, live for years and don't need staking, dividing or deadheading every five minutes. Aim for a mix of foliage and flower so the border looks good for eight months rather than three.

• Geranium 'Rozanne' – flowers from June to the first frost, weaves through neighbours, and needs nothing more than a chop back in late winter.
• Hellebores – evergreen foliage and winter flowers in shade or sun; simply cut off the old leaves in February.
• Persicaria amplexicaulis – tall, reliable and slug-resistant, with slender crimson or white spikes well into autumn.
• Alchemilla mollis – self-seeds politely, fills gaps, and looks wonderful after rain.
• Nepeta 'Six Hills Giant' – a haze of blue that bees adore; shear it after the first flush for a second showing.
• Sanguisorba and Veronicastrum – vertical accents that need no staking in a sheltered spot.

Plant in generous groups of three or five, water them in well for their first summer, and then let their roots do the work. Most perennials settle within a year and rarely look back.

Let Ornamental Grasses Do the Heavy Lifting

Grasses are the busiest gardener's secret weapon. They cover ground, hide the dying foliage of earlier perennials, move beautifully in a breeze and ask for almost nothing. The only job is an annual cut-back in late February or early March, leaving 10–15cm of stubble.

• Molinia caerulea – compact, tolerant of both damp and dry, with a haze of purple seed heads in late summer.
• Stipa tenuissima – fine, soft and luminous; plant it where it can spill over a path edge.
• Calamagrostis 'Karl Foerster' – upright, architectural and unfailingly tidy.
• Deschampsia cespitosa – happy in shade and clay, with shimmering seed heads that last through winter.
• Anemanthele lessoniana – pheasant's tail grass, evergreen in mild areas and brilliant in a gravel border.

Shrubs for Structure and Drought Tolerance

A border made only of herbaceous plants can look bare in winter. Add a handful of shrubs that tolerate dry summers and need no pruning beyond the occasional tidy-up.

• Rosemary and phlomis – aromatic, evergreen and happiest in poor, free-draining soil.
• Cistus – sun-loving, short-lived but generous, and content in gravel.
• Hydrangea paniculata – tolerant of most soils and best left unpruned apart from removing old flower heads in spring.
• Euonymus fortunei – evergreen ground cover for shade, variegated or plain green.
• Viburnum tinus – glossy leaves and winter flowers, needing only a light trim if it outgrows its space.

Plant shrubs slightly proud of the surrounding soil, mulch with bark or gravel, and resist the urge to feed them. Rich soil makes soft growth that flops and needs water; lean conditions make plants that look after themselves.

Mulch, Water Deeply, Then Leave Well Alone

A 7–8cm layer of bark chip, leaf mould or gravel does three jobs at once: it suppresses weeds, keeps roots cool and slows evaporation. Spread it over damp soil in spring, keeping it clear of stems and crowns. After that, water only when the top 5cm of soil is dry, and water thoroughly rather than little and often. Deep watering encourages roots downwards, where moisture lingers.

The first summer is the only one that demands attention. Water new plantings weekly, keep an eye on slugs, and pull weeds before they seed. By the second year, most plants will have knitted together and the border will largely look after itself.

Finally, accept a little looseness. A border that self-seeds, leans into its neighbours and shows a few seed heads through winter is far less work than one kept pruned to within an inch of its life. Plant generously, mulch properly, and then put the kettle on and enjoy it.