This renowned horticulturist, author, and garden designer will discuss fall planting, his role in developing two of South Carolina’s largest public gardens—Riverbanks Zoo Botanical Garden and Moore Farms Botanical Garden—and the organic nursery on his family’s 1750s farm in Beech Island, South Carolina. Members, $20; nonmembers, $25; lecture only, $15. Catered lunch included. Secure reservations by August 13 online at…