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I watched a programme where a couple boiled a head of crushed garlic in a litre of water until it had reduced by at least half. Let it cool, sieve it, bottle it and keep the concentrate in the fridge. Use two cap fulls in 5 litres of water and spray onto your plants, all the way to the base. You can burn the plants if you use too much but this did work.
I read somewhere that slugs live for around 5 years and just travel back if you chuck them over the fence (I have woodland beyond my fence!) so I go 'slug-hunting' at night with the old headtorch and trowel for halving and digging back into the ground as compost. I have noticed a reductionover the years in the population, but it is hard on my back as it is quite engrossing once you get going!