Usda Plant Hardiness Zone Map 2024 Pdf Download. “plant hardiness looks at how cold of a temperature a plant can handle and be able to survive through the winter months and continue to grow the next year,” mckernan. This essential tool is a.
Each growing zone is 10°f warmer (or colder) in an average winter than the adjacent. For example, seattle, washington, and the city of austin, texas, are both in the usda hardiness zone 9a because the map is a measure of the coldest temperature a plant.