04/25/2026
Dragonflies are among the most effective flying predators in a US garden β but the "100 mosquitoes a day" headline needs a footnote.
Under laboratory conditions, a single adult dragonfly can eat 30 to 100 mosquitoes in a day. The National Park Service notes the real-world number is usually closer to the low end of that range, and Maine mosquito control trials found that adding dragonfly nymphs did not meaningfully reduce local mosquito populations. Dragonflies are helpful. They are not a mosquito solution on their own.
What they do reliably: eat flies, gnats, midges, mayflies, and yes, mosquitoes. One yard with dragonflies has noticeably fewer small flying pests than one without.
πΏ Two things bring dragonflies into a yard, and plants are only the second one.
- Water comes first. Dragonflies spend 1 to 3 years as aquatic nymphs before emerging as adults. Without accessible water, no amount of planting will hold them. A small pond of at least 2 feet deep at the center, with sloped edges and a few emergent stems for nymphs to climb out on, turns a yard into dragonfly habitat. A birdbath refilled frequently is not enough for reproduction but does provide drinking and hunting perches
- Native flowers come second. Dragonflies do not feed on nectar. The plants help by attracting the small flying insects dragonflies hunt, and by providing sturdy vertical stems for perching between sorties
Native plants that build dragonfly-friendly structure:
- Black-eyed Susan, Rudbeckia hirta. Sturdy stems, summer-long insect traffic, tough across most of the US
- Purple coneflower, Echinacea purpurea. Upright flower heads double as perching points above open ground
- Swamp milkw**d, Asclepias incarnata. Moisture-loving and the single best insect magnet on this list. Feeds monarchs as a host plant too
- Marsh marigold, Caltha palustris. Early spring bloom at pond edges, draws the first emerging insects of the season
- Yarrow, Achillea millefolium. Long flowering period, flat umbels crowded with small pollinators β exactly what dragonflies hunt
- Joe-Pye w**d, Eutrochium maculatum. Tall, strong-stemmed, late summer bloom. Acts as a structural perch for adult dragonflies
- Blue flag iris, Iris versicolor. Native wet-edge iris ideal for pond borders. Use this instead of yellow flag iris (Iris pseudacorus), which is invasive in many US states
- Meadow blazing star, Liatris ligulistylis. Vertical purple spikes that pull in huge numbers of pollinators, feeding the dragonfly food chain
π± Two cautions worth knowing:
- If you add a pond, treat it with Bti (Bacillus thuringiensis israelensis) mosquito dunks or keep water moving. Otherwise the pond breeds more mosquitoes than the dragonflies eat
- Skip the bug zapper. It kills dragonflies, fireflies, beetles, and moths alongside any mosquitoes, and the net result is a yard with fewer predators and roughly the same mosquito pressure
A dragonfly-friendly yard is mosquito-lighter, not mosquito-free. Combine habitat with standing-water cleanup β empty saucers, gutters, and tarps weekly β and the two strategies work better together than either alone.