United to advocate professionalism, integrity and growth for Michigan's green industry

MNLA E-Training, Project Plant

USDA Hardiness Zone Map

On January 25, 2012, the U.S. Department of Agriculture (USDA) released the new version of its Plant Hardiness Zone Map (PHZM), updating a useful tool for gardeners and researchers for the first time since 1990 with greater accuracy and detail. The new map—jointly developed by USDA's Agricultural Research Service (ARS) and Oregon State University's (OSU) PRISM Climate Group—is available online at http://planthardiness.ars.usda.gov/PHZMWeb/