A south- or west-facing border is one of the most generous spaces in a British garden. Give it six hours of sun and it will reward you with scent, colour and, if you plant thoughtfully, a steady stream of bees, butterflies and birds from May right through to the first frosts. The trick is to stop thinking of it as a flower bed and start treating it as a small habitat: layered, slightly untidy in places, and full of plants that give something back.

Start With the Soil, Not the Shopping List

Before you spend a penny on plants, look at what you already have. Most cottage-style borders sit on heavy clay or thin, chalky soil, and both can be improved with nothing more than a generous mulch of garden compost each spring. Spread it 5–8cm deep and let the worms do the digging.

What you want to avoid is overfeeding. Rich, heavily fertilised soil grows soft, sappy leaves and relatively few flowers, and those flowers often carry less nectar. A moderately fertile soil, a little on the lean side, suits wildlife planting far better. If your border has been doused in feed for years, simply stop, and let it settle.

Two other essentials:

• Sunlight — most nectar-rich plants need a genuinely open, sunny position. Watch the border across a day before planting and note where the shade falls.
• Shelter — butterflies and bees avoid windy corners. A low hedge, a fence or a few taller perennials at the back make the border feel safe to them.

Pick Plants That Earn Their Keep

Nectar-rich, open-flowered plants are the backbone of a wildlife border. Double flowers may be showy, but many have lost the nectaries and stamens that insects actually need, so favour single varieties wherever you have a choice.

Reliable performers for a sunny British border include:

• Lavender and catmint (Nepeta) — the two hardest-working plants in any bee border. Both flower for months, both cope with dry soil, and catmint will give you a second flush if you shear it back after the first.
• Salvia, hyssop, oregano and thyme — aromatic, drought-tolerant and endlessly visited. Let the oregano flower rather than cutting it for the kitchen.
• Foxgloves and hollyhocks — tall spires that bumblebees work from the bottom upwards. Foxgloves will seed themselves politely around the border if you leave a few stems standing.
• Hardy geraniums, scabious, ox-eye daisy and knapweed — cottage-garden favourites that also happen to be wildflowers at heart.
• Sedum, asters and echinacea — late-season lifelines when much else has finished.

Plant in Layers, Not Rows

Nature never plants in single file, and neither should you. Build the border in three tiers so there is something to land on at every height.

• Ground level: thyme, bugle, wild strawberry and low geraniums to cover bare soil and keep moisture in.
• Middle tier: catmint, salvia, scabious and hardy geraniums — this is where most of the summer activity happens.
• Back of the border: foxgloves, hollyhocks, Verbena bonariensis and tall asters, with their airy stems letting light filter through.

Then add shrubs for structure and for the birds. A hawthorn, crab apple or holly at one end provides blossom in spring, berries or fruit later, and nesting cover in between. A lavender hedge along a path edge does the same job on a smaller scale.

Keep the Flowers Coming

A border that blooms for six weeks is lovely; one that blooms for five months is a larder. Aim for succession.

• Late spring: hardy geraniums, alliums, early lavender.
• Early summer: catmint, foxgloves, scabious, first salvia flush.
• High summer: lavender at its peak, hollyhocks, oregano, echinacea.
• Late summer and autumn: asters, sedum, second-flush catmint, verbena.

Deadhead the plants you want to keep flowering — catmint, salvia and lavender all respond well — but leave a good third of the border to run to seed. Seedheads feed finches and goldfinches through the winter and look far better than a tidy, empty bed.

The Untidy Bits That Matter Most

This is the part most gardeners find hardest. Resist the urge to cut everything down in October. Hollow stems, dried seedheads and drifts of fallen leaves are where ladybirds, lacewings and solitary bees spend the winter. Leave the border standing until late March or early April, then cut back in stages as the new growth appears.

A few small additions make a real difference:

• Leave a shallow dish of water among the plants, with pebbles for insects to land on.
• Never use pesticides or slug pellets in the border — a few nibbled leaves are a fair price for a garden full of birds.
• Mulch in spring with homemade compost or well-rotted manure, and skip peat-based products entirely.
• Allow a small patch of bare, sunny soil for ground-nesting bees and basking butterflies.

Do all of that, and by August your border will be doing the work for you: humming, fluttering, and quietly feeding the garden's whole little ecosystem.