This map is the standard by which gardeners and growers can determine which plants are most likely to thrive in a particular location. These hardiness zones are mentioned on every plant tag.
Last updated in 1990, most gardeners will find that their region has warmed by half a zone. This may give additional peace of mind when planting material that was not previously expected to survive a harsh winter. Climate changed isn't mentioned, the creators of the map say they relied on advanced measuring equipment and more weather monitoring.
The new map includes click and zoom state maps that provide detail down to a half a mile.
Yet, savvy gardeners have always known to locate microclimates. These sunny protected pockets can influence what is able to grow there since they can be up to ten degrees warmer than other areas of the same yard. So, push the edge of the envelope. Test the limits. It's called being in zone denial.
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