Slugs and snails take a special liking to the following: Dahlias, Delphiniums, Hostas, Lupines, Marigolds, Zinnias and almost any flower or vegetable seedling. Plants that are reputed to repel snails and slugs include Azaleas, Apricot, Basil, Beans, California poppies, Fennel, Fuchsias, Grapes, Ginger, Holly, Parsley, Peruvian lily, Pumpkins, Plums, Rhubarb, Sage and Swedish ivy.
Protect young plants by encircling them with a sandpaper collar. Either cut your own or use a sandpaper collar for a drill disc. The rough surface will discourage the soft bodied pests.
Dissolve 1 teaspoon each of jam, sugar and lemon juice in a glass of water, pour the mixture into a can with 2 or 3 openings cut in the side; push the sharp metal edges inward. Attracted by sweets, slugs will climb in it and be killed by the acidic lemon juice. Slugs and snails find also the yeast in beer irresistible: bury a container half filled with the brew where they can easily climb into it.
Beneficial insects are attracted to your garden by coreopsis, feverfew, and sweet alyssum.