The new map, created by USDA's Agricultural Research Service and ... plant suppliers and landscapers, who label plants and growing regions based on the classifications. Growers use zone ratings ...

Knowing the precise time to get annual plants into the ground and whether or not a perennial will grow in a given location is often buried in local community lore, but the US Department of Agriculture ...

According to a release from the USDA, the new map is more accurate and contains ... "When purchasing plants they typically will be labeled for their full hardiness zone, not segmented by 7a ...