The Slugs Give Up on Your Seedlings Once You Set Out These
Slugs do their work at 2am and blame the weather. Ending them is a system - bait, barrier and habitat denial - not a single silver bullet. Here is the system.

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Iron phosphate bait
The bait that is safe around everything else
Old metaldehyde baits poisoned dogs and wildlife; iron phosphate kills slugs and reverts to soil nutrition, certified for organic gardens and safe around pets, birds and toads. Scattered thinly at the first spring sowing - not piled - it cuts the population before the eggs of the year are laid.
Early season baiting matters most: every March slug is a hundred June eggs.
Copper tape for the strongholds
The barrier they will not cross
Copper reacts with slug slime in a way they find electric, and a band around raised bed rims, pot rims and the strawberry ring is a genuine wall - the wide tape, since the athletic ones bridge the skinny stuff. It guards the high-value real estate while the bait works the field.
Clean the rim before sticking, and mind the overhanging leaf bridges.
Sunken beer traps
The pub with no exit
Ridiculous, traditional and effective: slugs cross the garden for yeast, climb in and stay. Purpose-made traps beat tuna tins by keeping rain out and lasting seasons, and eight placed among the hostas and lettuce make a measurable dent as the perimeter systems squeeze.
The cheapest beer works fine - it is the yeast, not the vintage.
DE with a duster
The dry-week desiccant
Food-grade DE is microscopic glass to a soft body - a dusted ring around seedlings shreds and dries the crossing slug. Its honest limit: rain and dew switch it off, so it is the dry-spell tool, puffed fresh around the transplants that need a guarded week.
Reapply after every rain, or accept it as the fair-weather ally it is.
A red-light headlamp
The 10pm patrol settles it
Two damp evenings of picking with a headlamp and a soapy jar removes more breeding adults than a month of passive measures - red mode preserves your night vision and does not send them fleeing the beam. It is also, quietly, how you finally SEE what else patrols the garden at night.
Ten to midnight after rain is rush hour - twenty minutes does it.
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