Robert Gough holds a doctorate in botany and is Professor Emeritus of Horticulture at the College of Agriculture, Montana State University. He is the author of 17 gardening books, 500 extension service publications, and articles for Fine Gardening, Country Journal, National Gardening, Zone 4, Montana Magazine, and Harrowsmith. He served as Extension Horticulturalist in Montana, hosted the popular Dr. Bob's Northern Gardening Tips radio program for 10 years, and was a panel member on PBS's Montana Ag Live for 15 years. He is a Fellow of both the American Society for Horticultural Science and the North American Colleges and Teachers of Agriculture, as well as a member of the advisory… board of Zone 4.