Do Earwigs Eat Plants

If you’ve noticed ragged holes in your leaves or seedlings that seem to vanish overnight, you’re probably wondering about the culprits. A common question gardeners ask is: do earwigs eat plants? The short answer is yes, but the full story is more nuanced. These familiar insects with their distinctive pincers can be both a minor nuisance and a helpful predator in your garden. Understanding their behavior is key to managing them effectively.

Earwigs are primarily nocturnal scavengers with a varied diet. They are omnivores, meaning they consume both plant and animal matter. While they do feed on plants, they often prefer decaying organic material and hunt other small insects. Their plant-based menu can include tender seedlings, flower petals (like dahlias and marigolds), and soft fruits. The damage often looks like irregular chewed holes or notches along the edges of leaves. In severe cases, they can strip a young plant entirely.

What Plants Are Most at Risk?

Earwigs aren’t picky, but they have favorites. They are attracted to certain plants and conditions.

Seedlings and Young Transplants: Their tender tissue is an easy target for earwig feeding.
Flowers: Petals of clematis, dahlia, zinnia, and marigolds are often damaged.
Vegetables: They may nibble on lettuce, celery, chard, and the silk of sweet corn.
Fruits: Soft fruits like strawberries, apricots, and raspberries can be targeted, especially if they are overripe or damaged.

The Other Side: Earwigs as Beneficial Insects

Before you declare all-out war, consider their beneficial side. Earwigs are efficient predators of many common garden pests. A single earwig can consume a large number of:

Aphids
Small caterpillars
Insect eggs
Mites and other small arthropods

This makes them a form of natural pest control. The key is balance—tolerating a small population can be more helpful than harmful.

How to Identify Earwig Damage

It’s easy to mistake earwig damage for that caused by slugs, caterpillars, or beetles. Here’s how to tell the difference:

Pattern: Ragged, irregular holes in leaves and petals. Unlike slugs, they rarely eat the entire leaf vein.
Timing: Damage appears overnight, as they are active after dark.
Evidence: Look for the insects themselves. Check under pots, in mulch, or in damp, dark crevices during the day.
Seedling Loss: Entire small seedlings can be completely sheared off at the stem.

Effective Control and Prevention Strategies

If earwig populations are high and causing significant damage, here are practical, step-by-step methods to reduce their numbers.

1. Trap and Remove Them

Trapping is one of the safest and most effective first steps.

Rolled Newspaper or Cardboard: Loosely roll up damp newspaper or corrugated cardboard. Place it near affected plants in the evening. In the morning, shake the traps into a bucket of soapy water.
Low-Sided Can Traps: Bury a small tuna can or yogurt cup up to its rim in the soil. Fill it with a shallow layer of vegetable oil with a splash of soy sauce or fish oil for attractant. Earwigs will fall in and drown.

2. Modify Their Habitat

Earwigs thrive in moist, hidden spots. By making your garden less inviting, you can discourage them.

Remove excess mulch, leaf litter, and debris from around plant bases.
Allow the soil to dry out between waterings when possible.
Seal cracks in foundations and around doors where they might enter.
Store firewood and compost piles away from garden beds.

3. Create Protective Barriers

Protect your most vulnerable plants with physical barriers.

Wrap the stems of seedlings with a collar made from plastic cups or cardboard.
Apply a sticky barrier, like Tanglefoot, around the trunks of trees or the rims of pots.
Diatomaceous earth sprinkled around plants can deter them, but it must be reapplied after rain or watering.

4. Use Targeted Organic Pesticides (Last Resort)

If non-chemical methods fail, consider these options. Always apply at dusk when earwigs are active.

Insecticidal Soap: Direct sprays can kill earwigs on contact with minimal environmental impact.
Spinosad: This organic insecticide, derived from soil bacteria, is effective when applied to plant foliage.

Remember, broad-spectrum pesticides will also kill the beneficial insects that help control earwigs and other pests, creating a bigger problem long-term.

Encouraging Natural Predators

One of the best long-term strategies is to foster a garden ecosystem that keeps earwig numbers in check naturally. Birds, toads, frogs, and predatory beetles all eat earwigs. You can attract these allies by:

Installing a bird bath or bird houses.
Providing a small toad abode or a damp, shady spot for amphibians.
Avoiding pesticides that harm these helpful creatures.

Seasonal Considerations

Earwig activity peaks in late spring and summer when temperatures are warm and moisture is present. They are less active in the heat of midday. In the fall, females lay eggs in the soil, which hatch in the spring. Fall clean-up is therefore a critical time to disrupt their life cycle by clearing hiding spots.

FAQ: Common Questions About Earwigs in the Garden

Do earwigs only eat plants?

No, they are omnivores. While they can damage plants, they also consume decaying matter and prey on other insects like aphids, making them partially beneficial.

What plants do earwigs hate?

While no plant is completely immune, they tend to avoid strong-smelling herbs like rosemary, lavender, and thyme. Planting these near more vulnerable species may offer some protection.

Are earwigs dangerous to people?

No. Their pincers (cerci) look intimidating but are used for defense and capturing prey. They can give a mild pinch if handled, but they are not venomous and do not spread disease.

Why are earwigs in my house?

They usualy wander indoors by accident seeking shelter from dry or extreme weather. They do not breed or establish colonies inside like ants or termites. Sealing entry points and reducing outdoor harborage sites is the best prevention.

How can I tell if earwigs are the real problem?

Inspect your garden after dark with a flashlight. If you see many earwigs actively feeding on your plants, they are likely contributing to the damage. Also, their presence in traps near damaged plants is a strong indicator.

Managing earwigs is about observation and balance. A few earwigs in the garden are not a cause for alarm and can actually be helpful. By using traps, modifying habitats, and encouraging natural predators, you can protect your plants without resorting to harsh measures. The goal is a healthy, resilient garden where no single pest gets out of control.