Hardiness zone

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UK hardiness zones from 7 (bright green) to 10 (orange)

A hardiness zone (a subcategory of Vertical Zonation) is a geographically defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone.

For example, a plant that is described as "hardy to zone 10" means that the plant can withstand a minimum temperature of -1°C. A more resilient plant that is "hardy to zone 9" can tolerate a minimum temperature of -7°C.

Hardiness zones table[edit]

Hardiness zone Lowest temperature
0 < −51.1°C (−60°F)
1 −51.1°C (−60°F)
2 −45.6°C (−50°F)
3 −40°C (−40°F)
4 −34.4°C (−30°F)
5 −28.9°C (−20°F)
6 −23.3°C (−10°F)
7 −17.8°C (0°F)
8 −12.2°C (10°F)
9 −6.7°C (20°F)
10 −1.1°C (30°F)
11 +4.4°C (40°F)
12 > +10°C (50°F)


WikiGardener uses the hardiness zone scale to indicate where a plant grows best outdoors. It is entirely possible to grow plants outside of the advised zones. With the correct equipment a plant could be grown in controlled conditions in any environment.

Hardiness zone maps[edit]

United States of America  


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