Usda Hardiness Zone Map Arizona. The USDA map divides Arizona into. The original and most widely-used system, developed by the United States Department of Agriculture (USDA) as a rough guide for landscaping and gardening.
The United States Department of Agriculture has been a reliable authority for determining what plants can grow where in the United States. The farther south you go, the less dependable it. This map was developed by the United States Department of Agriculture to help consumers best determine which horticultural species will perform best in their particular geographic region.
The original and most widely-used system, developed by the United States Department of Agriculture (USDA) as a rough guide for landscaping and gardening.
Find Your USDA Zone: Hardiness Zone: (look up another zip code).
Most nurserymen agree that zone designations for plants are approximate. Hardiness zones are based on the average annual minimum temperature in a given area. This will tell you what growing zone you are in.