I know it is a constant source of frustration for many here to have their respective USDA garden zones mis-categorized by their local nurseries. I know this is the case for me in Calgary, where we are largely regarded as 3a, even though our climate data clearly shows we're on the warm side of
4a for the last 30 years. This is based on
30 years of data compiled at our freezing international airport (relative to the actual city)-and we come out on the warm side of 4a. This isn't the usual "well, we've been like 5b for the past 32 months, in my micro-zone, with a space heater and two light bulbs"
...And yet people here continue to call us 3a-based on what, I do not know!? Oh well, here's the proof, for my mental well being, at least (it's also a cool discussion about the usefulness of measuring temperature at airports and gardening zones in general):
http://forums.northscaping.com/post?id=2654415
Merry Christmas All!
Duncan
