The trick is to know which are which - and this is where the US hardiness zones come in. The USDA has split the country into 13 zones according to the average lowest winter temperature recorded at ...

The US hardiness zone system, in which the hardiness of a vast range of plants is matched to parts of the country with winters they can tolerate, is well known to gardeners everywhere. The Hardiness ...

This data has been plotted onto a map and the country divided into 13 zones which are displayed on the USDA Hardiness Zone map and numbered zone 1 (the coldest) to zone 13 (the warmest). The map ...

The United States Department of Agriculture (USDA) has released a new Plant Hardiness Zone Map (PHZM), the first update since 2012. The new map shows that most of the country, including New York State ...