Hardiness Zone

The hardiness category is indicated for each individual plant species. The hardinessĀ zones are developed by the Department of Agriculture in the United States. For plants in pots, you need to reduce the zone by two points, as potted plants freeze quicker than plants growing in open ground.

USDA zone

Minimum temperature

(Ā°C, average)

Winter hardiness

Example countries/ areas

1

< -45,5

very extreme

Central Siberia

2

-45,5 to -40,1

extreme

Siberia

3

-40,0 to -34,5

very excellent

Lapland

4

-34,4 to 28,9

excellent

Russia, Northern Scandinavia

5a

-28,9 to -26,1

very good (a)

Belarus, Eastern Baltic States

5b

-26,0 to -23,4

very good (b)

North-East Poland, Southern Ukraine, Central Sweden, Southern Finland

6a

-23,3 to -20,6

good (a)

Eastern Poland, Slovakia, East and Central Southern Sweden, Southern Norway

6b

-20,5 to -17,8

good (b)

Central Poland, Eastern Hungary, Czech Republic, South Sweden

7a

-17,7 to -15,0

reasonable (a)

Eastern Germany, West Poland, East and West coast of Sweden

7b

-14,9 to -12,3

reasonable (b)

Eastern Netherlands, South coast Sweden, Eastern Denmark

8a

-12,2 to -9,5

moderate (a)

Central Netherlands, Belgium, Northern and Central France, Northern England

8b

-9,4 to -6,7

moderate (b)

Dutch coast, Western France, Northern Italy, Central England

9

-6,6 to -1,2

poor

South coast of France, Central Italy, Central Portugal, South coast of England

10

-1,1 to +4,4

very poor

South and East coast of Italy, South coast of Spain, Southern Greece

11

> +4,4

none

(sub)tropical Africa