Taylor's Guide to Ground Covers: More than 400 Flowering and Foliage Ground Covers for Every Garden Situation - Flexible Binding (Taylor's Gardening Guides)
Nan Sinton is the director of programs at Horticulture magazine.  She  resides in Marion, Massachusetts.David Michener is assistant curator of the University of Michigan Botanical  Garden.  He resides in Ann Arbor, Michigan.