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A number for how cold it gets.
Also known as: USDA hardiness zone, Plant hardiness rating
The zone number classifying a region by its expected minimum winter temperature.
Classifies a region by its average annual minimum winter temperature, for matching plants to climate.
Contexts: Public information, Maps
Accounts for winter cold and nothing else, so it says nothing about summer heat, rainfall, humidity or season length — a plant can be hardy in a zone and still fail there for reasons the number does not address.
Contexts: Public information, Maps
The North American and European systems number differently, so a zone number without its system is ambiguous.
Zone numbering differs between national systems.
Contexts: Public information, Maps
A number, sometimes with a letter suffix, printed on a plant label and shown as a coloured band on a distribution map.