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USDA Growing Zones. .. Department of Agriculture Plant Hardiness & Gardening Zones in the USA. .. Plant Hardiness Zones were first designed in 1927 by Dr Map The 2003 National Arboretum "Web Version" of the USDA Plant Hardiness Zone Map .. Department of Agriculture, Washington, DC 20002 The .. Department of Agriculture, divides North America into 11 plant hardiness zones. Each zone is 10 degrees warmer else colder than the zone next to it. Zone 1 Will In Way back in 1960, the .. Department of Agriculture (USDA) may also find that some plants are labelled intended for a range of gardening Index |
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