The USDA plant hardiness Zone One is largely the northern hemisphere’s treeless tundra areas, or the “harshest of the harsh.”
The USDA plant hardiness zone six is dominantly in the northern hemisphere including a large area of Europe, Korea and northern Japan.
The U.S.D.A. classification of Zone Four for garden plants includes many regions in the northern hemisphere. What does it mean to be in Zone 4?
USDA plant hardiness zone five is the 40°N zone unless impacted by water or elevation influences, and is restricted to the northern hemisphere.
Plant Hardiness Zone Maps tell us what plants can grow in an area, even down to the zip code – how can we improve growing zone maps to incorporate ranges?