A hardiness zone is a geographic area with a similar average minimum temperature. The map is based on the average annual extreme minimum temperature, so people in those areas know which plants can ...
For example, the coldest hardiness zone in the lower 48 states on the new map, 3a, covers small pockets ... but those regions now have shifted completely into Canada. Zone 10b once covered the ...
The Hardiness Zones Map produced and recently updated by the ... less familiar approaches to hardiness. Firstly, there are ...