An Aerial Hunter Worth Waiting For

There is something wonderfully prehistoric about a dragonfly clattering over a garden pond on a warm July afternoon. Emperors, southern hawkers, four-spotted chasers and the needle-thin damselflies are among our most rewarding garden visitors, and they arrive for very practical reasons: warmth, water and somewhere to perch. They repay you generously. A single dragonfly can take hundreds of midges and mosquitoes in a day, hunting on the wing with a success rate that puts most garden birds to shame.

You do not need a large pond or expensive kit. What you need is clean water, a sunny aspect and a good supply of native plants — particularly the emergent kind that push their stems clear of the surface.

Start With the Water Itself

Dragonflies and their larvae are fussy about water quality. Nutrients, pesticides and run-off will quickly reduce a pond to a soup of algae with very little living in it. Fill with rainwater rather than tap water where you can, and avoid weedkillers, slug pellets and lawn treatments anywhere near the pond. A buffer of rough grass or planted margin between pond and patio helps filter whatever runs off the surrounding ground.

Sunlight matters just as much. Aim for at least six hours of direct sun a day, ideally with the pond open to the south. Shelter from strong wind is useful, but do not tuck the pond under overhanging trees — the shade keeps the water cold and you will spend every autumn fishing out leaves.

And leave fish out of a wildlife pond. Goldfish, koi and even sticklebacks make short work of dragonfly nymphs. A fish-free pond is a far more productive one.

Emergent Plants Are the Non-Negotiable Bit

Dragonfly nymphs live underwater for anything from a few months to three or four years, ambushing tadpoles and mosquito larvae among the stems. When they are ready to transform, they climb out and cling to a vertical stem while the adult body emerges, leaving behind the hollow, papery case known as an exuvia. Without stems rising clear of the surface, that final step is impossible.

So plant generously around the margins: tall vertical stems for climbing, floating leaves for cover and submerged oxygenators for the nymphs to hunt through.

Native Plants That Earn Their Place

Native species support far more insect life than exotic ones, and many are quietly handsome. A good starting selection:

• Yellow flag iris (Iris pseudacorus) — brilliant vertical stems and bold yellow flowers; grow it in a basket to keep it in check.
• Purple loosestrife (Lythrum salicaria) — tall spires of magenta through midsummer, loved by bees as well as dragonflies.
• Marsh marigold (Caltha palustris) — one of the earliest flowers of the pond edge, golden from March.
• Water forget-me-not (Myosotis scorpioides) — low, spreading and a favourite perch for damselflies.
• Flowering rush and bog bean — both excellent for shallow shelves.
• Soft rush, water mint and brooklime — good for softening the edges and providing varied cover.
• Hornwort (Ceratophyllum demersum) — a submerged oxygenator that needs no rooting and shelters nymphs beautifully.

Do avoid the invasive non-natives that can escape into the wider countryside: Australian swamp stonecrop, floating pennywort, water fern and parrot's feather are all best left alone. Anything vigorous is safest kept in a submerged basket.

Perches, Basking Spots and a Little Untidiness

Adult dragonflies are cold-blooded and spend a surprising amount of time sitting still in the sun. Give them somewhere to do it: a few flat stones at the water's edge, dead twigs pushed into the margins, a bare patch of warm gravel, or last year's iris seed heads left standing. Canes strapped horizontally near the pond will often be claimed within a week.

Resist the urge to tidy everything in autumn. Leave stems standing, allow some leaf litter to settle and do not empty and scrub the pond — nymphs overwinter in the silt, and a thorough clean-out can undo years of colonisation. If you must thin plants, do it in late spring, in small patches, and leave the cuttings on the bank for a day so anything caught up can crawl back.

What to Expect in the First Few Years

New ponds rarely attract dragonflies in their first season. The usual pattern is damselflies first, often within a year, then the larger dragonflies as the planting thickens and prey populations build. Watch for exuviae on stems and fence posts in early summer — finding one is proof that your pond is a breeding site, not just a stopping-off point.

Patience pays. A pond left to mature, with clean water, plenty of native marginals and a sunny, undisturbed corner, quietly becomes one of the busiest bits of wildlife habitat in the garden.