Maybe you are a first-time gardener trying to figure out what to plant, or maybe you are a seasoned grower trying to figure out why your perennial flowers never make it through the growing season. No matter your skill level, one of the most helpful pieces of information to guide you on your gardening journey is to figure out what your hardiness zone is. “It helps people understand what they can and cannot plant in their landscape,” Kate Garland, horticultural specialist at the University of Maine Cooperative Extension, said. Hardiness zones were developed by the U.S.