Planting in layers allows gardeners to take full advantage of their space and include a diversity of plants that provide beauty and benefit wildlife.  The Colonial Williamsburg 69th Garden Symposium, co-sponsored with the American Horticultural Society Friday, April 10 – Sunday, April 12, includes presentations by Rick Darke and Douglas W. Tallamy, authors of The Living Landscape, and two of the most important voices in sustainability and horticulture.  For full information on fees, lodging, and transportation, visit www.history.org/conted, or call 1-800-603-0948.