Good Tern Natural Foods Co-op Wellness Buyer Jodi Cooper (pictured) will lead a class on fermenting root vegetables on Wednesday, January 16, from 5 to 6:30 p.m. at the co-op, 750-754 Main Street in Rockland’s North End. Participants should bring a pint canning jar to the class. A hat will be passed to cover class expenses; for more information or to sign up, call 594-8822. The class is one in the co-op’s series of winter classes, lectures, exhibitions and other events, which this month include a CBD (cannabidiol) oil information session with The Medicine Farm, a Maine-based organic hemp oil farm, at 5 p.m. on Wednesday, January 23; a gallery opening with photographer Eve Hupper and wine tasting from 5 to 6 p.m. on Friday, January 25; and a class with aromatherapist Nancy Lubin at 1 p.m. on Sunday, January 27. The series will end on Sunday, February 3, with a hands-on class for all ages in making Valentine’s Day chocolates, taught by Cassandra Rossiter. All classes and events are free and open to the public. For more information, contact Gabriel Blodgett, the co-op’s education and outreach coordinator, at 594-8822.