I live in the Pacific Northwest and garden on a piece of heavily forested property. The slugs here are enormous and I've had to constantly review my efforts to keep slugs at bay.
Over the last two years, I've been experimenting with different vegetable varieties, and noticed that two cold-weather tolerant greens mature without any evidence of slug attacks. (Very rare in my garden!) They grow well when lettuce just limps along or freezes out and suffers tremendously from slugs. The flavor is good and they even seem to grow well in shady areas.