Hardiness Zones 101 The USDA Plant Hardiness Zone Map consists of 13 individual zones that take in all of the contiguous United States, plus Alaska, Hawaii, and Puerto Rico. The first zone lies at ...

The importance of hardiness zones lies in their ability to help gardeners and farmers choose plants that will thrive in their ...

Trees near the southern edge of their geographic ranges — what scientists refer to as “plant hardiness zones” — will ... forestry service. Loading map data... Unlike most plants, trees ...