BURLINGTON, Conn. (WFSB) - USDA plant hardiness zones categorize areas based on their average minimum winter temperatures.
The trick is to know which are which - and this is where the US hardiness zones come in. The USDA has split the country into 13 zones ... For additional accuracy, each zone is split into two subzones, ...
However, it’s the only nationwide system we have that’s used universally by nurseries and growers to guide you regarding the best plant selection. Here's what you need to know about plant hardiness ...