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Plant Hardiness Zones, (US)
Plant hardiness maps allow producers to label their plants as being suitable for
particular areas, and, in theory at least, this results in happy customers who can
confidently buy plants that will survive in their locality. Early in 1990 the United
States Department of Agriculture (USDA) published an updated version of their map of plant
hardiness zones. This divides the United States into 11 zones (1-11), characterized
their average minimum temperature. Zones 2 to 10 are also subdivided into a or b, giving a
total of 20 zones or sub-zones. These zones of course only apply to plants growing out of
doors with no protection, but which are provided with adequate water.
For an Australian Plant Hardiness Map (which has an excellent overview of Zone
Maps in general), click here.
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