The United States Department of Agriculture (USDA) Plant Hardiness Zone Map divides North America into 13 zones based on average annual minimum winter temperatures. These zones serve as a guide for gardeners and growers to determine which plants are most likely to thrive in a specific location. For instance, a plant labeled as hardy to zone 9 can generally withstand the minimum winter temperatures experienced in that zone.
Understanding the appropriate planting zone for a geographic area is critical for successful gardening and agricultural planning. Selecting plants adapted to a particular zone increases the likelihood of survival and optimal growth, reducing the need for excessive intervention and promoting sustainable practices. Historically, these maps have evolved to reflect changing climate conditions and more precise temperature data.
