Mike Heger, co-owner of Ambergate Gardens in Chaska, Minnesota, is one of the leading experts on gardening in cold climates. Debbie Lonnee, a thirty-year veteran of the nursery industry, works for Bailey Nurseries in Newport, Minnesota. She is a prolific garden writer and lecturer and the horticultural editor forNorthern Gardener. John Whitman is a garden writer and photographer. He is the coauthor ofGrowing Shrubs and Small Trees in Cold ClimatesandGrowing Roses in Cold Climates, both forthcoming in new editions from University of Minnesota Press.