April 20, 2026 · by Stachi · 2 min read
Slugs in the raised bed — what actually works (no poison)
Slugs are less of a problem in raised beds than ground beds, but they still get up there. Which measures actually work, and which you can skip.
Good news: raised beds are a hurdle for slugs. They can climb, but they don't want to. When they do, you usually get individuals, not the armies you'd see in a ground bed.
Bad news: individuals are enough to wipe out a row of lettuce seedlings overnight.
What actually works
1. Slug collars (plastic/copper around single plants). Works for raised-bed stars like lettuce seedlings. Fiddly to install.
2. Copper tape around the whole bed. Slugs get a tiny shock crossing copper. Lasts 3-4 years. ~15 € per 6 m of bed perimeter. Most effective raised-bed solution.
3. Beer traps (buried cup with beer). Lures from 5 m away. DOWNSIDE: also lures neighbours' slugs, your bed becomes a magnet. Only in heavy infestations.
4. Attract hedgehogs (compost heap nearby, wild corner). My favourite trick. Prickly relatives eat slugs happily. Works only if your garden is hedgehog-accessible.
5. Slug pellets (ferric phosphate) as emergency only. Bio- compatible, not toxic to hedgehogs/birds. Iron-phosphate-based, NOT metaldehyde (that's toxic to everything).
What's not worth it
- Coffee grounds around plants: 1-2 days effect, then slug-highway. Myth.
- Crushed eggshells: same, myth. Slugs crawl over them when hungry.
- Salt: also kills plant roots. Skip.
Most at-risk plants
- Lettuce (top target, every seedling)
- Young bean seedlings (first shoots)
- Strawberries (ripe fruit at ground level)
- Spinach, chard
- Young veg of any kind
What slugs mostly DON'T eat:
My slug schedule in the raised bed
- Pre-season (April): copper tape around — install once, 3-4 years of peace
- May-June: slug collars on lettuce seedlings (first 2-3 weeks, then remove)
- Dry weather: don't worry — slugs stay hidden
- Rainy spells: go out in the evening, hand-pick, into the compost (don't kill — unnecessary)
Companion planting as defence
Slugs avoid certain plants. If you sow garlic among lettuce, the lettuce zone takes less damage. Not 100% protection, but noticeable.
Full table: companion overview.
Slugs in a raised bed are a solvable problem. Copper tape + a hedgehog in the garden = you barely see any. Beans get 2 weeks of collar, then they're big enough to take the hit.
🦔 Stachi
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