Do Green Lacewings Eat Plants?

No, green lacewings do not eat plants. In fact, these delicate green insects are voracious predators of common garden pests, especially during their larval stage. Adult green lacewings feed on nectar, pollen, and honeydew, but their larvae actively hunt and consume aphids, mites, caterpillars, and other soft-bodied insects that damage your plants.

Many gardeners spot these slender green insects with their transparent veined wings and immediately worry about plant damage. The opposite is true. Green lacewings are among the most beneficial insects you can attract to your garden, and understanding their diet and life cycle can help you use them as natural pest control.

What Do Green Lacewings Actually Eat?

Green lacewings have two completely different diets depending on their life stage. This confusion often leads gardeners to ask whether green lacewings eat plants, since adults are sometimes seen resting on foliage.

Adult green lacewings feed exclusively on:

• Flower nectar
• Pollen
• Honeydew (the sweet secretion left by aphids)
• Plant sap from extrafloral nectaries

Adults do not have the mouthparts needed to chew leaves or damage plant tissue. They use a long proboscis to sip liquids, much like butterflies do. So when you see an adult lacewing on your tomato leaves or rose bushes, it is either resting, looking for a place to lay eggs, or feeding on nearby nectar sources.

Green lacewing larvae are the real pest hunters. These small, alligator-like insects are sometimes called aphid lions because of their insatiable appetite for aphids. A single lacewing larva can eat 200 to 600 aphids during its development. They also consume:

• Thrips
• Mites
• Whiteflies
• Mealybugs
• Small caterpillars
• Leafhopper nymphs
• Scale insects
• Insect eggs

The larvae have large, curved mandibles that pierce prey and suck out body fluids. They do not eat plant matter at all. This makes them entirely beneficial in the garden.

Are Green Lacewings Harmful to Plants or Helpful?

Green lacewings are overwhelmingly helpful to plants. They are considered beneficial insects in integrated pest management programs around the world. Unlike true plant pests such as aphids, beetles, or caterpillars, green lacewings never feed on leaves, stems, flowers, or roots.

The only situation where green lacewings might seem harmful is when you confuse them with other insects. Some lookalike species, such as brown lacewings or certain plant-feeding true bugs, can cause confusion. But green lacewings themselves pose zero threat to your garden vegetation.

Gardeners sometimes worry about lacewing larvae when they see them on plants, but these larvae are only hunting prey. They move quickly across leaves and stems, checking every surface for small insects. Their presence is actually a sign that your garden has a healthy ecosystem.

What Do Green Lacewings Eat at Different Life Stages?

Understanding the full lifecycle helps answer the question "Do green lacewings eat plants?" more clearly.

Egg Stage

Green lacewings lay tiny, oval eggs on the ends of long, thin stalks attached to leaves or stems. The eggs are usually pale green or white. No feeding occurs at this stage. The stalks protect the eggs from crawling predators, including ants that guard aphid colonies.

Larval Stage (Aphid Lions)

This is the most active feeding stage. Larvae emerge from the eggs and immediately begin searching for prey. They are carnivorous and will eat any soft-bodied insect they can overpower.

Larvae go through three instars (molting stages) over 2 to 3 weeks. During this time, a single larva consumes hundreds of pests. They are especially effective at controlling aphid outbreaks, which is why many farmers and gardeners buy green lacewing eggs for release in their gardens.

After the third instar, the larva spins a silk cocoon attached to a leaf or stem and pupates.

Pupal Stage

Inside the cocoon, the larva transforms into an adult. No feeding occurs during pupation. The cocoon is round and white or cream-colored, often mistaken for a spider egg sac.

Adult Stage

Adult green lacewings emerge from the cocoon and must wait about 24 hours for their wings to harden and expand. They then begin feeding on nectar, pollen, and honeydew. Some adult species also feed on female aphids, but this is not typical for all green lacewing species.

Adults live for 4 to 6 weeks. Females need protein from pollen to produce eggs, which is why they seek out flowering plants.

How to Attract Green Lacewings to Your Garden for Pest Control

Since green lacewings do not eat plants, you need to provide them with the food sources they do need to establish a population in your garden. Here are the best ways to attract and keep them.

Plant Nectar and Pollen Sources

Adults need flowering plants for food. The best choices include:

• Dill, fennel, and cilantro (allow them to flower)
• Cosmos and marigolds
• Yarrow and goldenrod
• Alyssum and buckwheat
• Angelica and Queen Anne's lace

Plant these near your vegetable beds or rose gardens to keep adult lacewings close to where their larvae will hunt.

Avoid Broad-Spectrum Pesticides

Insecticides kill green lacewings along with pests. Even organic options like neem oil can harm lacewing eggs and larvae if applied directly. Use targeted treatments only when necessary, and prefer insecticidal soaps or horticultural oils that are less harmful to beneficial insects.

Provide Water and Shelter

Like all garden insects, lacewings need moisture. Shallow water dishes with pebbles or damp soil areas work well. Leaving some leaf litter and mulch in your garden gives lacewings places to hide and pupate.

Release Commercial Lacewing Eggs

Many garden centers sell lacewing eggs or larvae for direct release. This is especially helpful if you have a sudden aphid infestation. You can buy live green lacewing larvae online and release them at dusk when predators are less active.

What Does Green Lacewing Damage Look Like on Plants?

Since green lacewings do not eat plants, they cause no direct damage. However, people sometimes see the aftermath of their hunting and mistake it for plant damage.

After lacewing larvae feed on aphids or mites, you may notice:

• Dried, shriveled aphid skins stuck to leaves
• Small black droppings (frass) on leaf surfaces
• Clean patches on leaves where pests were removed
• Honeydew residue disappearing over time as lacewings consume the aphids that produced it

If you see these signs, your green lacewings are working. The plant is not being harmed by the lacewings themselves. In fact, the plant is recovering from the pest pressure.

The only time you might see actual damage near lacewings is when the plant already has a pest problem. Lacewings show up because the pests are there, not because they cause the damage.

How to Tell the Difference Between Green Lacewings and Plant Pests

Some gardeners mistake green lacewings for plant-eating insects. Here is how to tell them apart from common lookalikes.

Green lacewing larvae move quickly and aggressively, while most plant pests move slowly or stay stationary. Lacewing adults are slender with a delicate appearance, while pests tend to be rounder or more compact.

Common Mistakes Gardeners Make About Green Lacewings

Even experienced gardeners sometimes misunderstand these beneficial insects. Here are the most common mistakes and how to avoid them.

Mistake 1: Killing Lacewing Larvae Thinking They Are Pests

Lacewing larvae look nothing like adult lacewings. They are brown, bumpy, and have large pincers. Many gardeners mistake them for earwigs, rove beetles, or even small caterpillars and kill them. Lesson: Learn to identify aphid lions so you recognize them as helpers.

Mistake 2: Spraying Pesticides While Lacewings Are Active

If you spray for aphids or mites, you also kill the lacewings that are eating those pests. Check your plants for lacewing eggs, larvae, or adults before spraying. If lacewings are present, wait or use a targeted spot treatment instead of a broad spray.

Mistake 3: Removing Weeds That Lacewings Use for Shelter

Some weeds like dandelion, clover, and wild carrot provide nectar for adult lacewings. Removing every weed removes their food sources. Leave a few flowering weeds in less visible areas of your garden to support beneficial insects.

Mistake 4: Expecting Instant Results from Lacewing Releases

If you buy and release lacewing eggs or larvae, they take time to reduce a pest population. You will see results within 1 to 2 weeks, not overnight. Be patient and avoid spraying anything during that time.

Why Green Lacewings Are a Gardener's Best Friend

When you understand that green lacewings do not eat plants, you can stop worrying and start appreciating them. These insects provide free, chemical-free pest control that targets the very insects that damage your garden.

A single green lacewing larva can eliminate hundreds of aphids before it becomes an adult. Adult lacewings pollinate flowers while they feed on nectar. And because they reproduce naturally when conditions are right, one release or one good season can lead to a self-sustaining population.

The next time you see a green lacewing resting on your plants, notice its bright green body and delicate, net-veined wings. Remind yourself that this insect is not eating your plants. It is either looking for nectar or searching for a good spot to lay eggs that will hatch into tiny pest-eating machines.

If you want to take advantage of this natural pest control, start by planting nectar-rich flowers, avoiding harsh pesticides, and considering a release of green lacewing eggs during the growing season. Your plants will be healthier, and you will have one less pest problem to worry about.

Green lacewings do not eat plants. They protect them. That simple fact makes them one of the most valuable allies any gardener can have.

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