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For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [37]
Various hardiness ratings are published. In the United States (US), the most widely used is the U.S. Department of Agriculture (USDA) system of hardiness zones based on average minimum yearly temperatures. [4] This system was developed specifically for the extremely diverse range of conditions in the US, from baking desert to frozen tundra.
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The USDA released a new hardiness zone map and half of the country has shifted. Read more here so you're ready to plant this spring. Big News, Gardeners: The USDA Just Updated Their Plant ...
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Summary. Description: English: map of USDA plant hardiness zones across Europe. Deutsch: Karte der USDA-Klimazonen in ... zone 11: 03:21, 15 February 2024:
The A is a surface horizon, and as such is also known as the zone in which most biological activity occurs. Soil organisms such as earthworms, potworms (enchytraeids), arthropods, nematodes, fungi, and many species of bacteria and archaea are concentrated here, often in close association with plant roots.