Join instructor Liz Riley for this online, six-session course on trees, shrubs and conifers that opens Monday, September 11, 2017. Longwood Gardens is partnering with North Carolina State University to provide a unique fully online survey of plants. This course examines trees, shrubs and conifers and reviews use and key identifying characteristics of plants through photo stories, presentations, online fact pages, and beautiful images. Learn more at Longwood Gardens. Photo credit Longwood Gardens.