What Is a Lacewing?
A lacewing is a small, delicate insect with clear, net-veined wings and a slender green or brown body. If you are asking what is a lacewing bug, the short answer is that it is not a true bug at all, it is a lacewing, an insect in its own group that is famous in gardens because its larvae eat soft-bodied pests. Adults look fragile and airy, but the young are active predators that help keep aphids, mites, and other small insects in check.
What a Lacewing Is
Lacewings belong to the insect order Neuroptera, a group known for wings with a lace-like network of veins. The most familiar garden species in the United States are green lacewings, though brown lacewings also appear around lights, shrubs, and vegetable beds. The adult insect is lightweight, with large compound eyes, long threadlike antennae, and four transparent wings held like a roof over the body.
People call them “lacewing bugs,” but that name is misleading. True bugs belong to a different order, Hemiptera. Lacewings are closer to antlions and owlflies than to stink bugs or squash bugs. The common name comes from the wing pattern, not from bug status.
How to Identify a Lacewing
Adult lacewing features
Adult green lacewings are pale green with bright golden eyes, while brown lacewings are tan to dark brown. Their wings are clear, slender, and crisscrossed with many veins, giving them a netted look. The body is soft and elongated, and the insect usually measures about 1/2 to 3/4 inch long. At rest, the wings stretch over the abdomen or sit tented above it.
Adults move lightly and fly with a fluttering, drifting motion. Many are attracted to porch lights and outdoor lighting at night. If you see a delicate insect with four glassy wings and long antennae resting on a leaf or screen, lacewing is a strong match.
Lacewing eggs and larvae
The eggs are easy to miss because each one sits on the end of a thin silken stalk. This spacing keeps newly hatched larvae from eating one another. The larva looks nothing like the adult. It is tiny, brown, and alligator shaped, with pointed jaws that curve forward. Gardeners sometimes call it an aphid lion because it hunts aphids with speed and precision.
That larval stage is the reason lacewings matter in gardens. The adult feeds on nectar, pollen, and honeydew in many species, but the larva is the predator that does most of the pest control work.
Life Cycle and Behavior
From egg to adult
Lacewings go through complete metamorphosis, with four stages, egg, larva, pupa, and adult. A female lays eggs on leaves, stems, or near prey-rich areas. The larva hatches, feeds hard, and grows through several molts. When ready, it spins a cocoon or pupates in a sheltered spot, then emerges as an adult lacewing.
This life cycle makes them valuable in gardens because the larvae feed during the stage when plants are most vulnerable to soft-bodied pests. One female can produce many eggs, so a small population can spread quickly if food and shelter are available.
How lacewings behave
Larvae are active hunters. They grab prey with hooked jaws, inject digestive enzymes, and suck out the contents. They target aphids, thrips, spider mites, whitefly nymphs, mealybugs, and small caterpillars. Adults behave very differently. They visit flowers, feed on nectar and pollen, and use sugars to fuel flight and reproduction.
Lacewings are nocturnal or crepuscular in many settings, so they are most active at dusk and at night. Their vision helps them find prey and navigate toward light, while chemical cues from plants and prey guide them to feeding sites.
Where Lacewings Live and What They Eat
Habitat in gardens and around homes
Lacewings live where shelter and prey are available. You will find them in vegetable beds, flower borders, hedges, orchards, meadow edges, and around porch lights. Tall grasses, mixed plantings, and insect-rich gardens create ideal conditions. Adults shelter in foliage during the day, and larvae hide on leaves where aphids cluster.
Because they hunt and feed on small insects, lacewings thrive in places with dense plant growth and little broad-spectrum insecticide use. A diverse garden supports them better than a bare, heavily trimmed landscape.
Diet across life stages
Lacewing larvae eat soft-bodied pests. Aphids are a top prey item, but they also consume mites, insect eggs, small caterpillars, scale crawlers, and whitefly nymphs. Adults of many green lacewing species eat nectar, pollen, and honeydew. That shift in diet is common in beneficial insects, where the juvenile and adult stages serve different ecological roles.
If you want lacewings in your yard, plant for both stages. Larvae need prey. Adults need flowers with accessible pollen and nectar, plus shelter from wind and heat.
Why Lacewings Matter in the Garden
Lacewings are one of the best natural allies for gardeners because their larvae attack pests that damage leaves, buds, and new growth. A single larva can eat dozens of aphids in a day, which makes it useful in vegetable gardens, rose beds, fruit plantings, and greenhouse spaces. They also help reduce pest outbreaks before those outbreaks spread across a bed.
They fit well into a natural pest-control approach because they do not damage plants, sting people, or require harsh sprays. When you support lacewings, you also support a broader insect community that includes ladybugs, hoverflies, parasitic wasps, and native bees.
How to Attract Lacewings Naturally
Plant the right flowers
Adult lacewings need small, open flowers with easy access to nectar and pollen. Good choices include dill, cilantro, fennel, alyssum, cosmos, yarrow, coreopsis, and Queen Anne’s lace. Keep some plants in bloom from spring through fall so adults can feed for a long season.
Use clusters instead of single plants. A patch of several flowering herbs or a drift of low flowers gives adults a reliable food source and encourages egg laying nearby.
Create habitat and avoid the wrong controls
Leave a few unmown or lightly managed edges, because lacewings need cover. Mixed plantings, small brushy areas, and layered beds help them stay in the garden. If you use mulch, keep it thin near the base of plants so you do not bury eggs and larvae.
Avoid broad-spectrum insecticides, even natural ones sprayed without care, because they can kill lacewings along with the pests. If you need to manage aphids or mites, use focused methods like a strong water spray, hand removal, insecticidal soap on the pest site only, or physical exclusion where possible.
Natural Ways to Use Lacewings Against Pests
- Inspect the underside of leaves for aphid colonies, whitefly nymphs, or mite webbing.
- Prune the worst-infested tips and place them in a sealed bag for disposal.
- Spray pests off with a firm stream of water in the morning so leaves dry before evening.
- Plant nectar flowers nearby to support adult lacewings and other beneficial insects.
- Leave some prey in the garden, because zero insects means no reason for lacewings to stay.
- Use exclusion on seedlings and young crops with row cover where pests are severe.
For indoor or greenhouse pest pressure, lacewings work best as part of a broader approach that includes sanitation and airflow. Remove heavily infested plant parts, reduce overcrowding, and keep the area clean so prey populations do not explode.
Frequently Asked Questions
What is a lacewing bug?
A lacewing bug is a common mistaken name for a lacewing. Lacewings are not true bugs. They are insects in the order Neuroptera, known for their lace-like wings and for larvae that prey on garden pests.
Are lacewings harmful to people?
No. Lacewings do not sting, bite people, or damage homes. Adults are harmless visitors, and the larvae are beneficial predators that help control pests on plants.
Do lacewings eat aphids?
Yes. Lacewing larvae are well known for eating aphids, along with mites, whitefly nymphs, thrips, and other soft-bodied insects. That is why gardeners value them as natural pest controllers.
How do I know if I have lacewing eggs or larvae?
Lacewing eggs sit on fine stalks, often on leaves near pests. The larvae look like tiny brown alligators with curved jaws and move quickly among aphids. Adults look like delicate green or brown insects with clear, netted wings.