† Requires Javascript
Copyright © 1997-2009 Demand Media. All rights reserved.
| Member | Message |
|---|---|
|
Posted: Oct/24/2008 11:10 AM PST
From the United States National Arboretum http://www.usna.usda.gov/Hardzone/ushzmap.html Also this web site will give you a chart to look at. http://theseedsite.co.uk/hardinesss.html And this is an interesting comparison between 1990 and 2006. You can see the warming changes. http://www.arborday.org/media/map_change.cfm |
|