Independent comparisons. We may earn from shop links. More info

How to use a beer slug trap

Updated: 23 October 2026

The cup is in the shed, the listing says bury it flush, and a magazine says leave the rim proud. That clash is the job of learning how to use a beer slug trap once you already own a cup or a bag. You need a hole, a liquid, a lid that stays, and a reason to empty the pot before the bait is soup. These steps follow RHS advice, a Gloucestershire Wildlife Trust leaflet, Gardeners' World, and the bait lines on the saved listings. There was no bed trial. The [snail trap comparison](/hub/pest-control/snail-trap) is the table if you have not bought. A qualifying purchase can earn us a commission at no extra cost to you.

The cup is in the shed, the listing says bury it flush, and a magazine says leave the rim proud. That clash is the job of learning how to use a beer slug trap once you already own a cup or a bag.

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
View offer
KANTA KANTA snail and slug trap, pack of 4

Rank 2

KANTA KANTA snail and slug trap, pack of 4
8.5/10about £8.49
View offer
SLUG TRAPPER SLUG TRAPPER disposable snail traps, 20

Alternative

SLUG TRAPPER SLUG TRAPPER disposable snail traps, 20
7.4/10about £9.99
View offer
On this page
  1. 1.Rim, not flush
  2. 2.What to pour in
  3. 3.Lid and where it sits
  4. 4.Empty and refresh

Rim, not flush

Leave the rim about 1–2 cm above the soil, even when the bullet says flush. Gardeners' World asks for at least 1 cm. A Gloucestershire Wildlife Trust leaflet puts the lip at about 2 cm so ground beetles are less likely to walk in. Kimroxi and Titifeya tell you to bury the cup flush. A KANTA reviewer caught nothing until the pot was only partly buried. Follow the wildlife lip. Sink the cup until the rim disappears and you have a pitfall for anything that walks. A downpour can slump the soil back to flush. Lift the cup a centimetre then, rather than adding more bait. A polythene bag has no rigid rim. Do not bury a pouch and call it the same method.

What to pour in

In a Garden Organic trial over a few dry days, lager caught about 6.4 slugs, bitter about 5.3, and water about 0.1. Those are glasses, not these shop cups. Water is a poor bait beside lager or bitter. Keep the fill shallow: magazines often say about one-third, KANTA says half a bottle, and a Noctra reviewer used about an inch of lager. Noctra allows beer or yeast and honey. One KANTA note used 1 teaspoon of yeast extract per litre. That is one note, not a garden recipe. A flour mix in a SLUG TRAPPER review was described as feeding slugs. The bag says leave beer for 3–5 days. That wait is not a reason to ignore a cup full of bodies on morning two. The 20–50 square metre line stays on the slug trap buying guide.
Noctra Noctra snail and slug trap, 4 pack

Testsieger

Noctra Noctra snail and slug trap, 4 pack
8.0/10about £7.49
View offer

Lid and where it sits

Put the trap at the edge of the border, not between the seedlings, so the path to the beer does not cross the crop. A second cup belongs where you still see damage, not at a neat 5 metres. Fit the lid, then weight or band it the same day. KANTA reviews say the lid only rests. Noctra reviews add wind, foxes, magpies, and sun warp. Titifeya's umbrella lid and Kimroxi's pagoda lid have no review line here, so test the fit in your hand. A bag has no rigid lid, and a cat can flood SLUG TRAPPER. Dogs and foxes are on the slug trap safe for dogs page.

Empty and refresh

Empty a cup in the morning when you can. The RHS prefers every morning. Every three or four days, as one Noctra reviewer did, is a compromise when you are at work, not a better method. Tip the catch, rinse, and pour a shallow mix back in. The bag's 3–5 day line ends with a stick to hook it out. Do not rinse a split bag and call it a cup. If the first nights are empty, move the trap to fresh slime and check the rim is still proud. What a full pot is allowed to mean is on do beer traps work for slugs.

Common questions

Do I bury the cup flush?
No. Leave about 1–2 cm of rim above the soil. Gardeners' World asks for at least 1 cm, and a wildlife-trust leaflet uses about 2 cm so beetles are less likely to fall in. Kimroxi and Titifeya say flush. If rain slumps the soil, lift the cup rather than digging it deeper. You should still see the rim when you look down.
Lager, ale, or a yeast mix?
Lager and bitter were close in the Garden Organic trial, about 6.4 and 5.3 over a few dry days, and water was about 0.1. Brand is not the lever. Noctra allows beer or yeast and honey. A 1 teaspoon yeast-extract figure in a KANTA review is one note, not a bulk recipe. If a homemade mix only draws trails, switch to a shallow beer and watch two more nights.
How often do I empty it?
Empty a cup in the morning if you can. That is the RHS preference. Every three or four days is a compromise when you are out, not an improvement. SLUG TRAPPER says leave a bag 3–5 days, then remove it. A cup that is rain and bodies by day four needs a rinse and fresh bait, not another week of the same liquid.
What if the lid blows off?
Weight it or band it on the day you set the trap. KANTA reviews describe a lid that only rests. Noctra reviews add wind, foxes, magpies, and warp in the sun. A stone or an elastic band is the fix those buyers use. A rain lid on an unreviewed three-pack can still be loose in your hand, so test the fit before you trust the bullet.
Can I use the bag the same way as the cup?
No. A bag has no rigid rim and no lid you can stone. SLUG TRAPPER uses the beer you pour in, and a review describes a cat standing on one until it floods. Follow the 3–5 day removal line for the bag. Keep the 1–2 cm lip, the edge of the bed, and the morning rinse for the cups.

Related pages

Snail trap

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

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

Do beer traps work for slugs? A short-range catch only

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)