Slugs and Snails: How to Protect Your Vegetables

The night-time vandal

You plant a row of lettuces in the evening and find stumps in the morning. Nobody was seen, because slugs and snails feed mostly at night and on dull, damp days; ragged holes and silvery slime trails are often the only clues. Seedlings and soft young growth suffer most, which is why the damage feels so sudden in spring.

Why your garden suits them

They thrive in cool, damp conditions and spend the day hidden under boards, stones, pots, debris and mulch. A tidy, damp garden full of hiding places right next to tender plants is ideal for them. Watering in the evening keeps the ground wet all night, just when they come out; water in the morning instead.

What actually works

The extension services agree: combine methods rather than trusting one.

• Hunt at night. Go out after dark with a torch and pick them off, and lay boards as shelters to check each morning.
• Barriers. Copper bands repel slugs and snails around pots and raised beds.
• Baits, carefully. Iron phosphate baits are the less toxic choice around pets and children, and they help rather than solve the problem.
• Beer traps. Sink them at ground level near vulnerable plants and empty them daily.
• Fewer hiding places. Clear debris and boards near seedbeds.

Recruit the night shift

Birds, frogs, toads, hedgehogs and ground beetles all eat slugs. A log pile, a small pond or a wild corner brings them in, and every one you attract works free every night of the season.

Protect what matters most

Sturdy transplants raised in pots cope with grazing far better than seedlings sown straight into the bed. Grow lettuce, cabbage and other favourites on until they are a decent size, then plant them out with a barrier around them.

Related problems: aphids, cabbage caterpillars, seeds not coming up. Or go back to all garden problems.

Slug and snail questions

Regional notes

The problem is the same on both sides of the Atlantic; local advice and timing differ. Trusted local guides for this page:

• UK: RHS: Slugs and snails. Timing in your area: the UK vegetable planting calendar.
• USA: Utah State University Extension: Controlling slugs and snails; UC IPM (University of California): Snails and slugs; University of Wisconsin–Madison Extension: Slugs. Timing in your area: the USA vegetable planting calendar.
• Canada: your provincial agriculture department, or Canadian university gardening services. Timing in your area: the Canada vegetable planting calendar.

More problems: all garden problems.

Sources and further reading

• RHS: Slugs and snails
• Utah State University Extension: Controlling slugs and snails
• UC IPM (University of California): Snails and slugs
• University of Wisconsin–Madison Extension: Slugs
• Oregon State University Extension: How to control slugs in your garden

Facts on this page are summarised in our own words from the pages above; each is supported by at least two of them, or by one plus well-established growing science (noted in our research file). Every source was opened and checked on 23 October 2026.

Keep a garden record

Most problems come back to the same beds in the same weeks. A simple record of what grew where, and when trouble started, lets you get ahead of it next year. Sketch your beds in the free Vegetable Garden Layout Planner Tool, and keep sowing dates, problems and harvests in the Global Vegetable Garden Planner (printable PDF). Every crop we cover is in the vegetable growing guides.