Understand Your Hardiness Zone Map & Microclimates
The USDA plant life hardiness zone map is something thatany gardener or horticulturist with meaningful experience shopping for plants is familiar with . ( If not , check out the online versionhere . ) Like an imposing umpire of vegetation diffusion , the gloss - coded map break the U.S. and Puerto Rico into 13 zone based on the average annual utmost minimal temperature — in other words , the lowest temperature each geographical zone know in a typical year ....