Signs of Slug Damage

Slug damage is easy to recognize once you know what to look for:

• Irregular holes with smooth edges in leaves, often starting from the edge or the center.
• Silvery slime trails on leaves, soil, paths and pots.
• Seedlings eaten to the ground overnight.
• Damage low on the plant and on fruit touching the soil, such as strawberries and tomatoes.
• Damage appears overnight, especially after rain or evening watering.

Caterpillars also chew holes, but they leave droppings instead of slime trails. Check your plants with a flashlight after dark to be sure. See our guide to garden insects for other pests.

Why You Have Slugs in the Garden

• Moisture: slugs need damp conditions; wet springs and evening watering favor them.
• Hiding places: boards, stones, pots, dense groundcovers and weeds give them shade during the day.
• Tender plants: seedlings, lettuce, hostas and strawberries are favorites.
• Thick, wet mulch close to plant stems can shelter slugs.

Slug Eggs and Life Cycle

Knowing the slug life cycle helps you get rid of slugs before the next generation hatches:

• Eggs: clusters of small, round, translucent or whitish pearls, often in moist soil, under pots, boards and leaf litter.
• When: most egg laying happens in spring and again in fall, when the soil is moist.
• What to do: when you find eggs while weeding or digging, remove them and leave them in the sun to dry out, or dispose of them.
• Young slugs: small slugs hatch within a few weeks and feed on seedlings; early-season control prevents a bigger problem later.

Turning over the top layer of soil lightly in fall exposes eggs to birds and drying. A sturdy trowel from a garden tool set is handy for checking under boards and pots.

How to Get Rid of Slugs: 9 Natural Slug Control Methods

Hand-Picking: Simple and Effective

Hand-picking is one of the most effective natural slug control methods, especially in small gardens:

• Water the area lightly in the late afternoon, then search with a flashlight about two hours after dark.
• Wear gloves, and drop slugs into a container of soapy water or seal them in a bag.
• Search daily at first; once numbers drop, a weekly check is usually enough.
• Look under leaves, along bed edges and around pots.

Good gardening gloves make this job more pleasant.

Slug Traps That Work

Keep the rim of beer traps slightly above soil level to avoid drowning ground beetles, which are natural slug predators.

Barriers: Copper and More

• Copper bands: bands 4 to 6 inches wide around raised beds or pots react with slug slime and repel them. Remove slugs from inside the barrier first.
• Raised beds: a copper band around the top edge makes a raised bed very difficult for slugs to reach. See how to build a raised garden bed.
• Rough materials: crushed eggshells, grit or wool pellets may slow slugs down, but results are mixed, especially when wet.

Remove Hiding Places and Change Watering

Changing the environment is the long-term way to get rid of slugs in the garden:

• Remove boards, stones, empty pots and debris near vulnerable plants, or use them as traps you check daily.
• Keep the area around seedlings free of weeds and dense groundcover.
• Water in the morning, so the soil surface is drier at night. Drip irrigation keeps the surface drier than sprinklers.
• Keep mulch thinner around slug-prone plants, or pull it back a little in wet periods.

Read more about timing in how often to water your garden, and about keeping weeds out of the vegetable garden.

Slug Bait: What Is Safe to Use?

If natural slug control is not enough, a slug bait can help. The active ingredient makes a big difference:

• Scatter bait thinly in the late afternoon or evening near hiding places and along slug routes; never in piles.
• Lightly water the area before applying to encourage slugs to come out.
• Always read and follow the label.

Have a dog? Read our tips on a dog-friendly garden, including safe product storage.

Natural Predators of Slugs

Many animals eat slugs and help with natural slug control:

• Ground beetles and rove beetles, which hunt at night.
• Toads and frogs, which you can attract with a small pond or damp, shady corner.
• Birds such as thrushes and robins.
• Garter snakes in many regions.
• Ducks and chickens, which eat many slugs if they can forage in a fenced area.

Avoid broad-spectrum pesticides, which also kill these predators.

Plants Slugs Love and Plants They Avoid

No plant is completely slug-proof, but choosing less tempting plants for damp, shady spots reduces slug damage a lot.

How to Protect Seedlings from Slugs

• Start seedlings in pots and plant them out when they are larger and tougher.
• Cover young plants with cloches made from plastic bottles.
• Put a copper band or collar around each seedling in problem areas.
• Check seedlings every evening in the first weeks after planting.

How to Get Rid of Slugs in the Vegetable Garden

• Keep a strip of bare, dry soil or gravel around beds of lettuce and seedlings, so slugs have to cross an exposed area.
• Harvest leafy greens regularly and remove damaged outer leaves, which attract slugs.
• Mulch vegetables with straw only once plants are well established, and keep it away from young seedlings.
• Water at the base of the plants in the morning with a gentle shower setting; our garden hose nozzle guide helps you choose one.
• Grow slug magnets such as lettuce and strawberries in raised beds with a copper edge.

For more on keeping vegetable beds tidy, read how to keep weeds out of the vegetable garden and our guide for beginners.

Slug Control Myths

Slugs in Pots and on the Patio

• Check under pots and saucers, where slugs hide during the day.
• Raise pots on pot feet or a plant stand so slugs have fewer hiding places underneath.
• Wrap a copper band around the rim of pots with tender plants such as lettuce, basil or hostas.
• Water containers in the morning so the surface is dry by evening.

Growing edibles on the patio? See how to grow tomatoes in pots and growing vegetables and greens in pots.

Protecting Hostas and Lettuce

Hostas and lettuce are the plants where slug damage shows most. To protect them:

• Start early in spring, as soon as hosta shoots appear; slugs love the young, rolled leaves.
• Choose thick-leaved or blue-leaved hosta varieties, which are often less damaged.
• Plant lettuce in raised beds or containers with a copper edge.
• Place board traps between the plants and check them every morning.

Slugs vs. Snails

Snails are slugs with a shell, and the same methods work for both. Snails can climb higher and seal themselves inside their shell in dry weather, so they may survive longer. Look for them on walls, fences and under dense groundcovers, and collect them during your evening rounds.

Mistakes to Avoid

• Using salt in beds: it harms soil and plants.
• Spreading slug bait in piles: it attracts pets; scatter it thinly as the label directs.
• Watering in the evening: it gives slugs a damp night to feed.
• Starting too late: slugs lay eggs in spring and fall; early control prevents a bigger problem later.
• Killing their predators: broad-spectrum insecticides also kill ground beetles that eat slugs.

Slug Control Calendar

Fall cleanup is part of our checklist to winterize your garden.

Frequently Asked Questions