Here are Charleston, SC organizations you might be interested in.
Lowcountry Fruit Growers Society ~ Learn about fruit, their horticultural needs, and the ability to grow them in Charleston. Contact: TheCitrusGuy@netzero.com
Charleston Permaculture Guild ~ A coalition of individuals learning, teaching, and implementing permaculture in and around Charleston. Contact: groupspaces.com/CharlestonPermacultureGuild
Charleston Horticultural Society ~ open membership, lectures, workshops, tours
S.C. Herbal Society ~ For a small annual membership fee, members learn about medicinal herbs during monthly meetings, workshops, seminars, and field trips. An herbalist apprenticeship is available as well.