Prepared by Lois Berg Stack, Extension ornamental horticulture specialist, University of Maine Cooperative Extension Reviewed and updated by Manjot Kaur Sidhu, Assistant Extension Professor of Horticulture and Ornamental Horticulture Specialist, University of Maine Cooperative Extension For information about UMaine Extension programs and resources, visit extension.umaine.edu.Find more of our publications and books at extension.umaine.edu/publications/. Table of