A handy guide published by NatureHub lists 11 of the best organic farms in NC.
Eagle Feather Organic Farm is — among other things — a Native Botanical Sanctuary. They grow organic medicinal herbs, including goldenseal and ginseng, as well as various other woodland botanicals.
Products include a cold and flu tincture and elderberry tincture. The farm sells books and videos, and also gives tours, classes and even apprenticeships on how to grow beneficial herbs.
See the full list at blog.naturehub.com/organic-farms-in-north-carolina