Hi Janet -- I agree with Diann. I you look at the Hosta web site you will see that characteristic defined -- it will say "Slug Resistant". Also you may want to get those that like the sun or do well in the sun -- not that you have to plant them in the sun but since you are in CA you will have more heat than us guys in MN and IA.
Also like Diann says -- then need a blast of cooler weather for them to go dormant and thrive!!
Let us know if you need anything else!!
