Why Moths Are Worth Staying Up For

Moths are the overlooked stars of the British countryside, and your garden is likely heaving with them. There are around 2,500 species in the UK, from the tiny apple leaf miner to the magnificent privet hawk-moth. On a warm night in June, a single suburban garden can attract over 100 species. They pollinate flowers, feed bats and songbirds, and tell us a great deal about the health of our hedgerows, woodlands and meadows. Trapping them is simple, inexpensive and endlessly surprising. You do not need a rural smallholding: a balcony, courtyard or modest back garden will do.

Choosing Your Kit: Light Traps and White Sheets

There are two main approaches. A purpose-built light trap uses a bulb suspended over a funnel, with a bucket or box below. The moths circle the light, drop through the funnel and settle among cardboard egg boxes, which give them dark crevices to hide in. Actinic bulbs are gentle on the electricity bill and draw in a good range of species; mercury vapour bulbs are brighter and more powerful but should be used considerately in built-up areas. If you would rather start simply, hang a white cotton sheet over a washing line or fence, peg the bottom corners, and shine a bright torch or camping light up the fabric. Moths land on the sheet and stay put while you admire them.

• Light trap: a plastic box, a funnel, egg boxes and a low-heat bulb.
• White sheet: an old cotton sheet, pegs, a bright torch or UV lamp.
• Essentials: a notebook, a torch, clear pots or tubes, and a hand lens.
• Optional: a camera or phone for photographs, and a soft paintbrush for moving delicate moths.

Setting Up for a Night's Trapping

Pick a mild, still, overcast night between spring and autumn. Moths fly best when the temperature stays above 8°C, the wind is light and there is moisture in the air. Avoid heavy rain, strong winds and the nights around a full moon, which can suppress activity. Set your trap or sheet near a hedge, tree line or flower border, not in the middle of a manicured lawn. For a sheet, place the light at the base and angle it upwards. For a trap, hang the bulb about 30cm above the funnel and check that rain cannot pool in the bucket. Use an outdoor extension lead with an RCD, or choose a battery-powered light to keep cables off wet grass. Run the trap from dusk until dawn, then check it early, before birds start hunting.

What You Might Find

Expect the common and the extraordinary. The large yellow underwing is a flappy, brown moth that often arrives in numbers. The silver Y carries a metallic mark like a Greek letter. The heart and dart is named for the markings on its forewings, while the peppered moth is a master of camouflage. Look for the brimstone, which folds its wings to resemble a leaf, and the poplar hawk-moth, a big, grey-brown creature with a startling red flash on its hindwings if disturbed. Micro-moths are smaller and trickier, but no less beautiful under a lens. Many rest with their wings rolled or tented, so take your time.

• Spring: Hebrew character, common quaker, early grey.
• Summer: hawk-moths, footman, burnished brass.
• Autumn: sallows, lunar underwing, black rustic.
• Winter: winter moth, mottled umber, December moth.

Recording and Responsible Trapping

Keep a simple record: date, site, weather, temperature, wind, and the species you see. A notebook is perfect, or you can pass your records to a county moth recorder or local moth group. This information helps conservationists understand how moths are faring. Be a considerate trapper. Do not run a light every night, especially in cold or wet weather, and never trap in a sensitive habitat without permission. Check the trap for bycatch such as beetles, caddisflies and even the occasional bat, and release everything gently into dense cover or a shaded hedgerow. If you use a sheet, turn the light off before you go to bed and let the moths disperse naturally. Sugar baiting, painting a mixture of ripe fruit and sugar on a fence post, is another gentle way to watch moths without a bulb.

A Year of Moth Nights

Moth trapping becomes a seasonal ritual. In March, the first common quakers and Hebrew characters appear. By June, the trap is busy with hawk-moths, buff ermines and silver Ys. August brings copper underwings and flame shoulders, while October offers lunar underwings and green-brindled crescents. Even December can produce the handsome December moth. Keep a diary of your best nights, note the weather and the moon, and you will soon learn which conditions suit your local patch. The more you look, the more you realise that a British garden at night is a woodland in miniature, full of wings, dust and quiet drama.