Apparently there have been major changes to the hardiness zone maps in the past 10-15 years or so. All of Missouri is now listed as Zone 6, with some areas even as high as Zone 7. You can see the changes on the Arborday.com site here.
Apparently there have been major changes to the hardiness zone maps in the past 10-15 years or so. All of Missouri is now listed as Zone 6, with some areas even as high as Zone 7. You can see the changes on the Arborday.com site here.