For slugs, we have long recommended the beer trap: Pour cheap beer into a shallow saucer or jar lid (use a few if the problem is severe). In the area where the slugs are abundant, set the container into the ground at lip level (so a bit buried; note that it might be easier to pour the beer in once the container is set, not before). Come back the next day. You should find that slugs have drowned in the beer. Discard them and the liquid. Repeat.
Some sources this is equally effective on snails. It certainly is cheap.
Be aware, too, though that other sources suggest that marigolds a slug/snail magnets. You might develop a new favorite flower …
For slugs, we have long recommended the beer trap: Pour cheap beer into a shallow saucer or jar lid (use a few if the problem is severe). In the area where the slugs are abundant, set the container into the ground at lip level (so a bit buried; note that it might be easier to pour the beer in once the container is set, not before). Come back the next day. You should find that slugs have drowned in the beer. Discard them and the liquid. Repeat.
Some sources this is equally effective on snails. It certainly is cheap.
Be aware, too, though that other sources suggest that marigolds a slug/snail magnets. You might develop a new favorite flower …