So, how do you know what to plant in zones 1 and 2 ... For additional accuracy, each zone is split into two subzones, zone 7a and 7b, for example, but this level of detail is not always needed. The ...
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 ... zones and five-degree half-zones, designated as A ...