THE ROOTS OF PASSION: The Inspired Gardener. Where does the passion for gardening come from? What inspires us to dig into the dirt and discover anew each season? The 28th Davidson Horticultural Symposium takes us on a journey to uncover the roots of our passion for the garden. Our speakers to include author Andrea Wulf (THe Founding Gardeners), Bill Thomas of Chanticleer, David Howard of Highgrove, plant explorer Sean Hogan and many other notables.