PLANT HARDINESS ZONES UK AND USA
I always tend to get confused when I have my eye on a certain plant and the label tells me it needs a certain condition, partial shade, a hardiness level or zone of whatever, and I am left trying to work out if my growing conditions fit the bill. I did a bit of research regarding hardiness (and understanding light and shade in gardening):
PLANT HARDINESS, RATINGS AND ZONES
Plant hardiness is treated differently in the United States of America to the United Kingdom. The USA which is many times larger than the UK, as we all know, is divided into United States Department of Agriculture (USDA) hardiness zones from 0 to 13b. It's all far too complicated for me to go into but here are a few useful links for you:
USDA - Plant Hardiness Zone webpage
USDA - Agricultural Research Service interactive map
UK - PlantMaps.Com - Plant hardiness interactive map - Fahrenheit
UK - PlantMaps.Com - Plant hardiness interactive map - Celsius
UK - Royal Horticultural Society New (2012) Plant Hardiness Ratings
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Plant hardiness is treated differently in the United States of America to the United Kingdom. The USA which is many times larger than the UK, as we all know, is divided into United States Department of Agriculture (USDA) hardiness zones from 0 to 13b. It's all far too complicated for me to go into but here are a few useful links for you:
USDA - Plant Hardiness Zone webpage
USDA - Agricultural Research Service interactive map
UK - PlantMaps.Com - Plant hardiness interactive map - Fahrenheit
UK - PlantMaps.Com - Plant hardiness interactive map - Celsius
UK - Royal Horticultural Society New (2012) Plant Hardiness Ratings
HARDINESS
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U.K.
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USA
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Rating
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Centigrade
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Zone
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H1a
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Above 15
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13
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H1b
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10 to 15
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12
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H1c
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5 to 10
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11
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H2
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1 to 5
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10b
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H3
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1 to -5
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9
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H4
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-5 to -10
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8b/9a
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H5
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-10 to -15
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7b/8a
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H6
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-15 to -20
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6b/7a
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H7
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Below -20
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6a/1
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