Answer: Here's some ways to get rid of them that are organic/natural. Sink little plastic containers (such as butter tubs) into the soil so they are level with the ground. Fill them with beer. If you don't have beer, a mix of sugar, yeast and water also works. The aptly named slugs like to drink the stuff, and will fall into the container and drown.
Another method is to use barriers of diatomaceous earth or sawdust. Diatomaceous earth is basically tiny, fossilized silica shells made into an insecticidal powder. The slugs will crawl through it, be cut, and eventually die.
You can also create places for them to hide during the day, such as boards, garden pots, etc. over holes/depressions in the ground. They'll crawl under and can be easily collected.
Finally, you can go out at night with a flashlight and collect them around plants where you have seen signs of damage.
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