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Do beer traps work for slugs?

Updated: 23 October 2026

You emptied a pot full of bodies and the lettuce was holed again by Friday. That is when people ask whether beer traps work for slugs, and the honest answer is narrower than a full pot feels. A trap can catch slugs over a short distance. In trials other groups cite, more caught has lined up with less damage. It does not clear a garden for the season, and an empty pot in a dry week is not a broken cup. The counts below are Garden Organic's. The eight shop listings in the [snail trap comparison](/hub/pest-control/snail-trap) are not those glasses. A qualifying purchase can earn us a commission at no extra cost to you.

You emptied a pot full of bodies and the lettuce was holed again by Friday. That is when people ask whether beer traps work for slugs, and the honest answer is narrower than a full pot feels.

Our top picks

Noctra Noctra snail and slug trap, 4 pack

Best overall

Noctra Noctra snail and slug trap, 4 pack
8.0/10about £7.49
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Pimaja Pimaja snail trap, 4 pieces

Alternative

Pimaja Pimaja snail trap, 4 pieces
7.8/10about £11.29
View offer
KANTA KANTA snail and slug trap, pack of 4

Rank 3

KANTA KANTA snail and slug trap, pack of 4
8.5/10about £8.49
View offer
On this page
  1. 1.What the counts actually show
  2. 2.Empty pot, full pot
  3. 3.Not a pellet and not a nematode
  4. 4.What you still do in the bed

What the counts actually show

Garden Organic's dry-season trial used glasses, not the cups in our table. Lager caught about 6.4 slugs, bitter about 5.3, and water about 0.1. In trials they cite, more slugs caught has gone with less plant damage. That is a short-range effect, not a guarantee for one cup. Read 6.4 as a handful. Leopard slugs were scarce, and a Pimaja review said large snails did not enter. An RHS test at Wisley did not score beer traps, and the barriers in that test did not help the lettuce. Do not cite it as proof the traps failed.

Empty pot, full pot

A full pot means slugs reached that bait. It does not mean the bed is safe for the month. If damage continues a few metres away, add a trap there. Do not pour a deeper beer and hope the radius grows to 50 square metres. That area is one seller's sentence. An empty pot in a dry week can be stale bait, dry soil, or a quiet corner. One Noctra note says about 30 slugs a day for three days. Both can be honest. They are not the same season. Refresh and move the cup before you bin it. The rim and the fill are on how to use a beer slug trap.
Noctra Noctra snail and slug trap, 4 pack

Testsieger

Noctra Noctra snail and slug trap, 4 pack
8.0/10about £7.49
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Not a pellet and not a nematode

A beer cup is not a pesticide. From 1 April 2022 it has been illegal in Great Britain to sell or use metaldehyde slug pellets outdoors. Leftovers belong at a household waste site. Ferric phosphate can still be lawful when that named amateur product is on the Health and Safety Executive garden database. An example at research time was MAPP 15141. The name on your tub still has to be checked there. A cup of lager does not inherit a pellet's label rate. Nematodes are a different product. Phasmarhabditis hermaphrodita is unlikely to affect snails, on RHS advice, and it wants moist soil around 5–20°C. A trap does not become a nematode because both are sold as gentler than a banned pellet. Pets and the beer are a separate limit, on the slug trap safe for dogs page.

What you still do in the bed

Keep the trap at the edge of the soft plants, leave the rim proud, and look in the morning. Young lettuce can justify a cup for a fortnight. A mature shrub that loses a few leaves does not need a ring of pots. If seedlings are still disappearing, move a second cup to the new damage. Do not add cups to make 50 square metres. What to buy is on the slug trap buying guide. Call it a success when damage on those plants has eased and you are still emptying a modest catch. Call it the wrong tool when the pot stays empty after you have moved it, or when the pests are snails. We did not count slugs in a bed.

Common questions

If the pot is full, is the bed safe?
No. A full pot means slugs reached that bait over a short distance. It does not mean the rest of the bed, or the season, is clear. Garden Organic's dry-season glasses held a handful, not a wipe-out, and the RHS says trap the vulnerable patch and keep emptying. Leaves holed a few metres away belong to slugs that did not have to visit your cup.
If the pot is empty, has the method failed?
Not on one dry week. Water caught about 0.1 slugs in that trial, and lager was still a handful. An empty cup can be stale bait, a flush rim, or a quiet corner. Move it to fresh slime and refresh the liquid before you decide. If seedlings are still going after that, the trap is missing the problem. That is a limit, not a broken cup.
Do traps pull in slugs from next door?
The citable evidence is a short-range catch, not a draw from the next street. More slugs in the pot has lined up with less damage in trials Garden Organic cites, which fits animals already near the bed. Place the cup where you see slime. Do not expect one pot to patrol the whole garden or the boundary.
Are large snails caught as well as slugs?
Do not assume it. Leopard slugs were scarce in the Garden Organic catch, and a Pimaja reviewer said large snails did not enter. A pot of small slugs can leave snail damage on the leaves. Nematodes are also unlikely to affect snails, on RHS advice, so swapping products does not close that gap. Look at the plants, not only at what is floating.
Is a beer trap better than a legal pellet?
They are different tools. A cup is not a pesticide and has no label rate. Outdoor metaldehyde has been illegal to sell and use in Great Britain since 1 April 2022. Ferric phosphate can still be lawful if that amateur name is on the HSE database. Better depends on whether you want a visible catch or a pellet label. This page does not rank a tub against a cup.

Related pages

Snail trap

Best slug trap: top pick, value cup, and who to skip

Slug trap buying guide: cups, bags, and pack counts

How to use a beer slug trap: proud rim, bait, and lid

Slug trap safe for dogs: beer, loose lids, and lungworm

Sources

Public UK sources used for this comparison. Shelf prices, stars and review counts are the amazon.co.uk figures captured for these eight listings. Last checked 22 October 2026.

  1. RHS slugs and snails (retrieved 22 October 2026)
  2. Garden Organic slug trapping (retrieved 22 October 2026)
  3. GOV.UK metaldehyde outdoor ban (retrieved 22 October 2026)
  4. Defra metaldehyde dates (retrieved 22 October 2026)
  5. HSE garden pesticide use (retrieved 22 October 2026)
  6. Roman snail protection order (retrieved 22 October 2026)
  7. Gardeners' World on young plants (retrieved 22 October 2026)
  8. MBM Veterinary Group slug note (retrieved 22 October 2026)