RHS Hardiness Zones - Plants

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Above 59°F (15°C)

Tropical conditions requiring heated greenhouse year-round

Heated tropical glasshouses

50°F to 59°F (10°C to 15°C)

Subtropical conditions requiring heated greenhouse in winter

Heated temperate glasshouses

41°F to 50°F (5°C to 10°C)

Frost-tender plants requiring frost-free conditions

Unheated glasshouses, mild coastal areas

32°F to 41°F (0°C to 5°C)

Tolerates low temperatures but not frost, needs protection

Isles of Scilly, Channel Islands, Coastal Cornwall

23°F to 32°F (-5°C to 0°C)

Hardy in mild areas with some frost tolerance

Coastal South England, South Wales, Coastal Ireland

14°F to 23°F (-10°C to -5°C)

Hardy through most of UK, survives average winters

London, Birmingham, Manchester, Edinburgh

5°F to 14°F (-15°C to -10°C)

Hardy in most areas including severe winters

Yorkshire, Lancashire, Scottish Lowlands

-4°F to 5°F (-20°C to -15°C)

Hardy in all UK regions including exposed uplands

Lake District, Peak District, Scottish Highlands

Below -4°F (-20°C)

Extremely hardy, tolerates severe European winters

Scottish mountains, Northern Scandinavia equivalents