Attracting Dragonflies to a Garden Pond

Why Dragonflies Choose Some Ponds and Ignore Others

A dragonfly will not waste its time on a pond that offers nothing. These are sharp-eyed, fast-moving insects, and they make a quick judgement about whether a patch of water is worth visiting. The basics are simple: sun, stillness and the right plants in the right places. Get those right and you will see common darters, southern hawkers, broad-bodied chasers and dozens of blue damselflies hunting over your water by midsummer.

Above all, dragonflies want sunshine. A pond that sits in shade for most of the day will always be quiet; aim for at least six hours of direct sun on the surface. Shelter matters too, so keep tall shrubs on the windward side, but never let them cast shadows across the water itself. A wildlife pond of a metre and a half across, with a mid-water depth of 50 to 60 centimetres, is plenty to work with. Leave the fish out of it — they eat the larvae.

Marginal Plants: The Hub of Pond Life

Marginal plants are the single most useful thing you can add. They give larvae somewhere to hide and climb, provide adults with perches and hunting platforms, and shelter the smaller insects that dragonflies feed on. Plant them in baskets of heavy, low-nutrient soil so they do not swamp the water, and group them in generous clumps rather than single specimens.

• Yellow flag iris and purple loosestrife for height and bold vertical stems.
• Marsh marigold for early colour and low, sturdy leaf cover.
• Water mint and lesser spearwort for soft growth at the waterline.
• Soft rush, sedges and flowering rush for the thin, upright stems that emerging nymphs will climb.

Those upright stems really do earn their keep. A dragonfly nymph lives underwater for one to three years, then crawls up a stem in early summer, splits its skin and pumps itself up into an adult. If there is nothing to climb, it cannot leave. Keep a good spread of rushes and iris around the edges and you will find the empty, translucent cases clinging to them from June onwards.

Submerged Oxygenators: Clarity That Keeps the Larvae Alive

Submerged oxygenators work unseen, but they hold the whole pond together. They absorb nutrients that would otherwise feed algae, keep the water clear, and add dense underwater structure for hunting nymphs and the small invertebrates they eat. An oxygenator that has vanished is often a sign the pond has turned green and stagnant.

Plant them in baskets or bunches weighed down with a stone, and use two or three different kinds for resilience:

• Hornwort — unfussy, evergreen in mild winters and excellent at mopping up nutrients.
• Water starwort — fine-leaved, good in shallower water and shady corners.
• Curled pondweed and water milfoil — useful mid-depth cover for larvae.

Do not add oxygenators until the pond has settled for a few weeks, and thin them out by hand each summer so the water stays open rather than choked. Aim to leave roughly a third of the surface clear.

Sunny Stones and Perches

Dragonflies are cold-blooded and spend much of their day basking. A flat stone or a slab of weathered brick placed at the water's edge, catching full sun and slightly angled towards it, will be used constantly. Set a few in the shallows so they sit just proud of the surface, and put one or two bigger ones on the bank nearby.

Add a mix of perching heights so different species can share the space:

• Flat, sunlit stones at the water's edge for darters and chasers.
• Bare twigs or a dead branch pushed into a margin, for patrolling hawkers.
• Tall seed heads and grass stems left standing over winter as natural perches.

Position the stones on the south-facing side of the pond, away from overhanging branches. You will often spot a dragonfly returning to exactly the same stone, time and again, all afternoon.

Where They Lay Eggs — and What That Means for Planting

Different dragonflies have different egg-laying habits, and knowing this explains why a well-planted pond works so much better than a bare one. Hawkers and many damselflies have a sharp ovipositor and insert their eggs into the soft tissue of floating or submerged plant stems, or into wet mud at the waterline. Chasers and darters flick droplets of water, each carrying eggs, into the pond as they hover above it.

To cover both approaches, you need soft-stemmed marginal and floating plants, exposed mud, and open water. Water lilies and floating heart give insertion points in the shallows, while a shallow, gently sloping bank of bare mud or gravel lets others lay directly into the damp edge. Avoid steep, hard-sided ponds; a shallow, planted shelf at one end does far more for wildlife than a sheer drop into deep water.

Small Touches That Make a Big Difference

Once the structure is right, the rest is gentle management. Leave the pond margins standing over winter rather than cutting everything back in autumn — those hollow stems shelter larvae, frogs and insects. Clear dead leaves from the surface in autumn to stop the water turning sour, but do it by hand rather than with a net that sweeps everything up at once.

Never use pesticides, fertilisers or tap water near the pond, and top it up with rainwater from a butt in dry spells. Give the plants a season or two to knit together, and the dragonflies will arrive on their own. When a southern hawker patrols your margin in July and a darter claims its favourite stone, you will know the pond has become what it was always meant to be.