Tired of seeing young shoots devoured by slugs as soon as they emerge? Discover how to make, in just ten minutes and with a simple household scrap, an eco-friendly trap that is as clever as it is effective. Follow step-by-step guide to protect your veg patch while preserving your garden's biodiversity.
ℹ️ Practical info
Materials needed
- Container : 1 empty plastic bottle (1.5 L or 2 L).
- Tool : 1 pair of sturdy scissors or a craft knife.
- Bait : half a glass of beer (even low-quality or flat).
- Installation : 1 small garden trowel (hand trowel).
Good to know : if you prefer not to use beer or don't have any, a mix of water, sugar and baker's yeast also works very well.
Assembly steps
1. Cutting
Carefully cut bottle in two. Cut should be at about two-thirds of height (measured from base). You will obtain a large base and a small funnel.
2. "Nasse" assembly
- Remove cap from top section.
- Turn neck upside down and insert it neck-first into bottle base.
- Note : if assembly shifts, secure edges with two staples or a piece of adhesive tape, although this is usually unnecessary.
3. Placing in the veg patch
This step is essential so slugs can find entrance:
- Dig a hole near plants to protect (but not too close!).
- Push bottle into soil so funnel opening sits level with soil surface.
- Slugs must be able to "slide" inside without having to climb over a high plastic rim.
Strategic placement : do not place trap in middle of lettuce; position it 1 or 2 metres away. Goal is to attract slugs away from vegetables, not to invite them to buffet!
4. Filling
- Pour beer through neck. Fill to about 3–5 cm of liquid. Smell of fermentation will attract gastropods from several metres around.
- Rain cover : if it rains, beer will be diluted and lose effectiveness. Place a broken tile or a small wooden board elevated on two stones above trap.
- Empty trap every 2–3 days. This is least pleasant part, but essential to keep bait attractive.
Beware of beneficials : to prevent useful insects (such as ground beetles, natural predators of slugs) or small rodents from falling in, do not make too large a hole at centre of funnel.
Why it works
Slugs are irresistibly attracted to fermentation aromas. Once they descend into funnel to feed, smooth plastic walls and inverted shape prevent them from climbing back out. They eventually drown in liquid.
Respecting garden balance
Although often seen as gardener's enemies, slugs play an essential ecological role by actively contributing to decomposition of dead organic matter, enriching soil with nutrients. They also provide a vital food source for many garden allies, such as hedgehogs, toads, ground beetles and some insectivorous birds. By regulating their presence rather than attempting total eradication, you maintain a natural balance essential to ecosystem health.
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