As the light drains out of a warm summer evening, the garden changes hands. Daytime pollinators clock off, and a different crew arrives — moths, lacewings, bats and hedgehogs. If your borders only perform in daylight, you are missing half the show. Night-scented plants are the ones that fill the air with fragrance after dusk, and once you plant a few, you will wonder why you waited so long.

Why Some Flowers Save Their Scent for Night

Most flowers that release scent after dark are pollinated by moths, and moths navigate largely by smell. A plant that wastes its fragrance on a sunny afternoon is wasting energy, so evolution has pushed these species towards evening and night-time scent production. Many are pale — white, cream, soft yellow — because paleness reflects what little light remains and makes the flowers easier for a moth to spot against dark foliage.

The scent itself is often sweet, heavy and carried on warm air. On a still, humid evening it can travel astonishing distances. Plant a clump of night-scented phlox near a path or a seating area, and you will smell it long before you see it.

There is a practical bonus for the gardener. Because these plants open or intensify in the evening, they reward you exactly when you have time to sit outside with a glass of something cold after a long day.

Six Reliable Night-Scented Plants for British Gardens

These are all proven performers in UK conditions, and most are easy from seed.

• Night-scented phlox (Zaluzianskya ovata) — low-growing, cottagey, with white flowers that snap open in the evening and release a rich, almost honeyed perfume. Needs sharp drainage and a sunny, sheltered spot; treat it as a hardy-ish perennial in mild areas and take cuttings as insurance.
• Evening primrose (Oenothera biennis) — tall, statuesque and generous. Its lemon-yellow flowers open visibly in the late afternoon and glow in twilight. It self-seeds freely, so give it room or deadhead ruthlessly.
• Nicotiana (Nicotiana alata and its relatives) — the classic. Sow in spring, plant out after the last frost, and the tall white trumpets will scent a whole garden from July to the first frosts. Dwarf varieties are ideal for pots by the back door.
• Night-scented stock (Matthiola longipetala) — unremarkable by day, unforgettable after dusk. Cheap to sow in drifts and perfect for filling gaps.
• Honeysuckle (Lonicera periclymenum) — our native woodbine is at its most fragrant in the evening and doubles as a larval food plant for moths.
• Jasmine (Jasminum officinale) — a wall or pergola plant rather than a border one, but a single specimen can perfume an entire patio on a still night.

Planting for Moths, Not Just for You

Pale, tubular, night-scented flowers are the fuel stop moths need. Many species have a long proboscis and can only feed from deep-throated blooms, so including trumpet shapes matters as much as the scent itself.

Add nectar-rich plants that flower late into autumn, when moths are fattening up before winter. Verbena bonariensis, buddleja, sedum and ivy are all excellent, and ivy is one of the very best autumn nectar sources in the country — let a patch of it flower rather than cutting it back in September.

Do not forget the larval side of the equation. A moth garden needs leaves as well as nectar. Native trees and shrubs such as oak, birch, hawthorn, hazel and crab apple support caterpillars, and a little untidiness — long grass, seed heads left standing, leaf litter at the base of hedges — makes all the difference.

Practical Steps for an Evening Garden

Design the space so it works after dark, which is a different job from designing for daytime colour.

• Group scent. One nicotiana here and one there is a lovely thing, but a drifting mass of fragrance is unforgettable. Plant in clusters of three or five, ideally where a path or a doorway funnels the air past you.
• Light gently. Moths are easily confused and exhausted by bright white security lights. Use warm, low-level lighting on a timer, or better still, none at all. A single candle or a solar lantern is plenty.
• Shelter the site. Scent lingers in still air. A courtyard, a hedge-backed border or a walled corner will hold fragrance far better than an exposed plot.
• Keep water nearby. A shallow dish, a small pond or even a saucer of damp gravel helps bats, moths and hedgehogs, and gives you reflected evening light.
• Resist tidying everything. Leave seed heads standing through winter, let a corner of grass grow long, and pile prunings somewhere out of sight. This quiet generosity is what turns a garden into habitat.

Making It a Sensual Evening Garden

The best night gardens engage more than one sense. Pale flowers and silver foliage catch the last light, so plant artemisia, lambs' ears and white cosmos among your night-scented stars. Add movement with grasses that rustle in the slightest breeze, and consider a gravel path that whispers underfoot.

Plan a route. A bench placed at the far end of a fragrance-heavy border, or a doorway flanked by pots of nicotiana, turns the act of stepping outside into something quietly theatrical. Scent that you walk through is far more powerful than scent you merely stand beside.

Give it a season or two. Night-scented plants often need warmth to build up their essential oils, so a wet, cool July will disappoint and a dry, balmy August will astonish you. Sow generously, plant in drifts, leave the corners alone, and switch off the floodlights. The garden you walk into at ten o'clock on a summer night — humming with moths, heavy with perfume, entirely your own — is worth every seed packet.