“Will it grow in my zone?” is the pertinent question about plant hardiness for perennials. The lines on the maps for zones are changing, slowly.
The U.S. Department of Agriculture updated plant hardiness map reveals that hardiness zones are drifting, illustrating the warming trend
Despite the warming trend, borderline hardy plants in my garden continue to suffer winter damage. The apparent message for gardeners is that global warming hasn’t altered plant hardiness zone designations.