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According to the new map released in November 2023, about half of the United States has shifted to a new hardiness zone. That's really big news if you consider 80 million Americans use this map to ...
Here’s the thing most people miss with the whole cold hardiness map thing. The zones represent mean annual minimum temperature, not the minimum temperature.So in my now zone 7a Kentucky garden ...
For example, Seattle, Washington, and the city of Austin, Texas, are both in the USDA hardiness zone 9a because the map is a measure of the coldest temperature a plant can handle.
The USDA rejected the AHS 2003 draft map; the agency stated it would create its own map in an interactive computer format. As of August 2010 the AHS and the National Arboretum websites still present the 1990 map as current. In 2006, the US National Arbor Day Foundation completed an extensive updating of U.S. Hardiness Zones. It used essentially ...
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.
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]
According to the new map released in November 2023, about half of the United States has shifted to a new hardiness zone. That's really big news if you consider 80 million Americans use this map to ...
The USDA Plant hardiness zones for the state range from zone 8a (no colder than 10 °F (−12 °C) ) in the Crestview to zone 10b (no colder than 35 °F (2 °C) ) in Southeast Florida in 1990. [17] Miami Beach and the keys are Zone 11. Fall foliage in North Florida