The night before cooking, rinse dried white beans in cool water until water runs clear. Place in a large jar or bowl and cover with water (about 1 inch above the beans). Let soak overnight. If you don't have time to soak over night, bring beans to a boil, then remove from heat and let sit for an hour before draining and using.
In a slow cooker, combine all ingredients, except potato, and stir together. Cook on Low for 8 hours.
One hour before serving, add potatoes to slow cooker. Continue cooking for 1 hour or until potato is tender. Remove herbs before serving.