Interestingly, the first edition of the plant hardiness zone map was created by Arnold Arboretum at Harvard in 1927! And ...

Plant hardiness zone maps are, well, all over the map. Consider the number assigned to your zip code as a starting point. You may live right at the break between one zone and the other.

he asked. “In many cases, we can utilize the labeling on the plants and the USDA climate zone map. “These are also referred to as plant hardiness zones.” The USDA’s plant hardiness zone ...