For additional accuracy, each zone is sometimes split into two subzones, zone 6a and 6b, for example, but this level of detail is not always needed. At the same time, professional ...
This includes the Yellow Hibiscus Tree, another hardy plant, that can survive in 6a zones and warmer. Yellow Hibiscus Trees ...
In Tennessee, the state ranges in four different zones, 6a (-10 to 15 degrees Fahrenheit) in the highest altitude of the mountains to 8a (10-15 degrees Fahrenheit) in southern parts of the state.