Discovering the Mysteries of Zone 12: US Plant Hardiness at Its Peak We weren’t able to create a summary for you. Refresh your page to try again. The USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which perennial plants are most likely to thrive at a location. The map is based on the average annual extreme minimum winter temperature, displayed as 10-degree F zones and 5-degree F half zones. The USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which perennial plants are most likely to thrive at a location. The map is based on the average annual extreme minimum winter temperature, displayed as 10-degree F zones and 5-degree F half zones. Plant Hardiness Zone Map The USDA Plant Hardiness Zone Map w... How are the zone numbers and colors interpreted? 6 days ago · The meaning of DISCOVER is to make known or visible : expose. How to use discover in a sentence. Synonym Discussion of Discover. present participle of discover 2. to find information, a place, or an object, especially for the…. discovering synonyms, discovering pronunciation, discovering translation, English dictionary definition of discovering. dis·cov·ered , dis·cov·er·ing , dis·cov·ers 1.