I guess that this post is intended to be informational, or at least interesting to those of us who still tend to think of growing zones 1-11. I learned this year that the plant hardiness zones were updated in 2012, and now range from 1-13 with subcategories a and b. At my location, the zone has been changed from 5 to 6a. No, that doesn't mean that it is 20% warmer now. It just means that with more data the USDA has been able to make greater distinction between growing areas.
Here's the summary of the revision: http://planthardiness.ars.usda.gov/p...tWhatsNew.aspx
And, an interactive map if you'd like to find your hardiness zone: http://planthardiness.ars.usda.gov/PHZMWeb/
Have fun, and think about revising your signature line!