A visual comparison of USDA gardening zones from 1976 to 2020
NPR: “The USDA’s gardening zones shifted. This map shows you what’s changed in vivid detail Recently, the USDA updated its plant hardiness map for the first time in 11 years. If you’re a gardener — and everybody can be a gardener, even on a balcony or a stoop — this is a big deal! The updated map opens …