Quote:
Originally Posted by Kevin
Does it matter what latitude you're at? A zone 7 is a zone 7 no matter where it is. It should be the same temps in order to be called the same zone.
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Zone designations only use the average yearly minima.
Northern Zone 7: (just made up as an example)
Cold Week:
14-28F, 8-21F, 3-18F, 10-25F, 17-30F, 15-28F, 20-32F
Southern Zone 7:
Cold Week:
5-34F, 14-38F, 21-44F, 28-50F, 33-55F, 35-60F, 32-58F
Both are zone 7 but one is clearly cooler. The prolonged cold will penetrate deeper into the soil.