
Department of Horticulture
Landscape Plants
Images, Identification, and Information
Main Page USDA Hardiness Zone Map of the United States
Other maps: Oregon
Washington Idaho
(for other states, see US Nat. Arboretum site)
From the US National Arboretum, released 2012 See (http://planthardiness.ars.usda.gov/PHZMWeb/#)