5 Ways to Keep Pill Bugs from Destroying Your Garden

Have you planted seeds or seedlings only to find them chewed down overnight? Pill bugs (also called roly-polies, rollie pollies, or potato bugs) are usually considered beneficial because they feed on decaying organic matter. But when populations get too high, they can quickly damage tender seedlings, young plants, ripening strawberries, and other garden favorites.

I’ve learned this lesson the hard way. Over the years, pill bugs have destroyed countless seedlings in my garden, often just as they were getting established. As an organic gardener, I’m not willing to reach for pesticides when pill bug populations get out of balance. Instead, I’ve tested a variety of natural control methods to protect vulnerable plants while maintaining a healthy garden ecosystem. These are the strategies that have worked best for me.

Pill Bug Basics

What are pill bugs?

Pill bugs, also known as roly-polies or woodlice, are small crustaceans that belong to the Armadillidiidae family. These gray, oval-shaped creatures are about ½ inch (1.3 cm) long and are easily recognized by their ability to roll into a tight ball when disturbed. Although they are often mistaken for insects, pill bugs are more closely related to shrimp and crabs.

Where do pill bugs live?

Pill bugs thrive in moist environments and spend most of their time hiding in cool, damp places. In the garden, they are commonly found beneath mulch, rocks, boards, pots, and decaying organic matter. They prefer areas that stay consistently moist and are most active at night or during cooler parts of the day.

Are pill bugs good for the garden?

Most of the time, yes. Pill bugs play an important role in the garden ecosystem by feeding on decaying plant material and helping break it down into organic matter. This natural recycling process improves soil health and returns nutrients to the soil. In balanced numbers, pill bugs are beneficial decomposers rather than pests.

When do pill bugs become a problem?

Problems arise when pill bug populations become too large or when tender plants are one of the few food sources available. Although they prefer decaying organic matter, pill bugs will also feed on young seedlings, newly emerged sprouts, strawberries, squash, and other fruits or vegetables that rest on the soil surface. Damage is often most severe in heavily mulched or consistently moist gardens where pill bug populations can grow rapidly.

Is it really pill bugs?

Before trying to control pill bugs, make sure they are actually causing the damage. Pill bugs are often blamed for problems caused by slugs, earwigs, cutworms, or other garden pests. Pill bug damage is most common on tender seedlings and fruits that touch the soil. If you regularly find large numbers of pill bugs around damaged plants, especially in damp, mulched areas, they may be contributing to the problem.

Signs pill bugs may be causing damage:

• Seedlings disappear shortly after emerging
• Young stems or leaves have shallow chewing damage
• Strawberries have small gouges or feeding scars
• Damage occurs near the soil surface
• Large numbers of pill bugs are present around affected plants

Pill bugs aren’t the only creatures that can damage plants in the garden. Correctly identifying the cause of the damage is the first step toward choosing an effective solution. Learn how to identify and manage common garden pests in these guides to aphids, whiteflies, squash bugs, cabbage worms, leaf-footed bugs, thrips, spider mites, and more.

Not every insect in the garden is a pest. Beneficial insects such as ladybugs, lacewings, hoverflies, assassin bugs, and parasitic wasps help keep pest populations under control. Learn how to attract beneficial insects to your garden and how to identify beneficial insect eggs before removing them.

1. Remove Their Favorite Hiding Places

Pill bugs thrive in cool, damp environments where they can hide during the day and feed at night. Reducing the conditions they prefer won’t eliminate them completely, but it can help keep populations from getting out of control.

Start by removing places where pill bugs like to gather, such as wet leaves, fallen fruit, boards, pots, and piles of decaying organic matter. Avoid overwatering whenever possible, and allow the soil surface to dry slightly between waterings. Excessive mulch and constantly damp conditions create ideal hiding places for pill bugs and encourage larger populations.

Remember that pill bugs are an important part of a healthy garden ecosystem, helping break down organic matter and improve soil. The goal isn’t to eliminate them completely, but to make your garden less inviting when their numbers become high enough to damage seedlings and crops. Encouraging natural predators such as birds can also help keep populations in balance.

2. Trap Pill Bugs Before They Damage Plants

If pill bug populations are concentrated in one area of the garden, traps can be an effective way to reduce their numbers. Check traps daily and remove the pill bugs you collect. You can relocate them to another area of your yard where they are less likely to cause damage, or dispose of them.

Use Fruit Traps

Pill bugs are attracted to soft, moist fruit. Cut a citrus fruit, melon, or other fruit in half and place it cut-side down near affected plants. Overnight, pill bugs will gather beneath the fruit. Check the trap each morning and collect any pill bugs hiding underneath. Fruit traps can often be used for several days before they need to be replaced.

Use Beer or Yeast Traps

Beer and yeast traps are one of the most effective ways to reduce pill bug populations. Sink a shallow container, such as a pie plate or yogurt container, so the rim is level with the soil surface. Fill it with beer or a mixture of 1–2 tablespoons of yeast dissolved in water. Pill bugs are attracted to the scent, fall into the trap, and drown. Empty and refill traps as needed until populations are under control.

3. Protect Seedlings With Collars

Of all the methods I’ve tried, collars are the most effective way I’ve found to protect vulnerable seedlings from pill bug damage. After losing countless seedlings to rollie pollies, I started experimenting with simple barriers around plant stems. The results were immediate—seedlings that had previously been chewed down were finally able to grow and thrive.

I’ve successfully used duct tape, newspaper, and paper tube collars to protect young plants. Each creates a barrier between the seedling stem and hungry pill bugs until the plant is large enough to withstand minor feeding damage.

Duct Tape Collars

Wrap a small piece of duct tape around the stem of a seedling with the sticky side facing out. Bury part of the tape below the soil surface, leaving some above ground as well. The sticky barrier prevents pill bugs from reaching the tender stem.

Be sure to remove the tape once the seedling begins to outgrow it so it doesn’t restrict the stem.

Newspaper Collars

For a biodegradable option, tear a strip of newspaper and wrap it loosely around the seedling stem, burying the bottom portion if possible. As the plant grows, the newspaper naturally breaks down and falls away, making this an easy, low-maintenance solution.

Paper Tube Collars

Toilet paper or paper towel tubes can also be used as collars. Slide the tube over the seedling and push it 1–2 inches into the soil. This creates a physical barrier around the stem while the plant is young.

I’ve had mixed success with paper tube collars. Sometimes they work very well, but occasionally pill bugs find their way inside the collar. If you’re dealing with severe pill bug pressure, duct tape collars tend to be more reliable.

4. Overplant to Stay Ahead of Pill Bug Damage

Some crops are best direct-sown in the garden, making collars difficult or impossible to use. In those cases, one of the simplest ways to improve your chances of success is to overplant.

Instead of planting one or two seeds, sow three or four. When pill bug populations are high, it’s common for some seedlings to be damaged shortly after they emerge. By planting extra seeds, you increase the odds that at least one seedling will escape damage and continue growing. In my garden, this strategy has saved many crops that would otherwise have been lost.

Once the surviving seedlings are established, thin them to the desired spacing. To avoid disturbing the roots of nearby plants, cut extra seedlings at soil level rather than pulling them out. I like using these fine tip shears for extra precision.

While overplanting doesn’t reduce pill bug populations, it can be an effective way to work around the problem until seedlings are large enough to tolerate minor feeding damage.

5. Use Organic Controls When Necessary

If pill bug populations remain high despite habitat management, traps, collars, and overplanting, several organic control options can help bring numbers back into balance. I reserve these methods for areas where pill bugs are causing significant damage to seedlings or crops.

Slug & Snail Bait

Iron phosphate slug and snail bait is one of the most effective products I’ve found for controlling pill bugs. Although it is marketed for slugs and snails, pill bugs are also attracted to it. They eat the iron phosphate, which slows them down so much they die. It’s non-toxic to worms and may help plants flower.

After planting beans twice without success, I replanted a third time and applied a small amount of iron phosphate bait according to package directions. Within days, the beans emerged and grew without damage.

Choose an OMRI-listed (Organic Materials Review Institute) product and follow all label directions for safe and effective use. My favorite is this Garden Safe Slug & Snail Bait.

Diatomaceous Earth (DE)

Diatomaceous earth (DE) can help reduce pill bug populations around vulnerable plants. Made from fossilized aquatic organisms called diatoms, DE works by damaging the outer layer of a pill bug’s exoskeleton, causing it to dehydrate.

To use DE for pill bug control, apply a thin layer around their frequented areas, wear gloves,, avoid windy conditions, and re-apply after rain. Apply in the late afternoon when the bugs are active and follow the product label for safe and effective results. Although DE is considered safe for people and pets, avoid inhaling the dust by wearing a mask during application.

Beneficial Nematodes

Beneficial nematodes are microscopic organisms often used as a natural method for controlling garden pests.

The species Steinernema carpocapsae has been shown to help reduce pill bug populations. These nematodes are applied to the soil, where they seek out pill bugs and other susceptible pests. Once inside the host, they release beneficial bacteria that quickly kill the pest.

One of the advantages of beneficial nematodes is that they work below the soil surface, reaching pests that may be difficult to control with traps or barriers. They are also considered a safe and environmentally friendly option because they target specific pests and do not harm plants, earthworms, pollinators, or most beneficial insects.

Unlike collars or traps, which provide immediate protection, nematodes are best thought of as a long-term population management tool. They can be especially helpful in areas where pill bugs are a recurring problem year after year.

For best results, apply nematodes to moist soil and water them in immediately after application. They are living organisms and can be sensitive to heat, drought, and direct sunlight. Apply them during cooler parts of the day and keep the soil consistently moist for several days afterward to help them establish and remain active.

While beneficial nematodes can be very effective, they work best as part of an integrated approach that also includes reducing hiding places, trapping pill bugs, and protecting vulnerable seedlings.

Natural Control Methods for Pill Bugs

Pill bugs play an important role in the garden by breaking down organic matter and improving soil health. The goal isn’t to eliminate them completely, but to keep populations in balance so they don’t damage seedlings, strawberries, and other vulnerable plants.

Over the years, I’ve found that combining several methods works better than relying on any single solution. Reducing hiding places, protecting seedlings with collars, trapping pill bugs, overplanting when direct sowing, and using organic controls when necessary can all help keep damage to a manageable level.

If pill bugs are causing problems in your garden, start with the least invasive methods first and increase your efforts only as needed. With a little persistence, you can protect young plants while still maintaining a healthy garden ecosystem.