DAVIDSON – The 28th annual Davidson Horticultural Symposium is set for March 6 on the Davidson College campus. This year’s theme is “The Roots of Passion: The Inspired Gardener,” and speakers include Andrea Wulf, who wrote of "Founding Gardeners," Bill Thomas of Chanticleer, David Howard of Highgrove, plant explorer Sean Hogan and many others. For more information, visit www.davidsonsymposium.org, call 704-892-9062 or email davidsonsymposium@gmail.com.