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The old 2012 map, seen here, isn't as detailed or regional as the new plant hardiness map, in large part to the 2023 map including data from many more weather stations.
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 ...
Hopkins' bioclimatic law states that in North America east of the Rockies, a 130-m (400-foot) increase in elevation, a 4° change in latitude North (444.48 km), or a 10° change in longitude East (two-thirds of a time zone) will cause a biological event to occur four days later in the spring or four days earlier in the fall. [1]
Weather. 24/7 Help. ... If you want to plant a perennial that thrives on neglect, catmint is a winner! ... USDA Hardiness Zones: 4 to 9. How Much Sun It Needs: Full sun. When It Blooms: Mid-summer ...
In general, hardy palms can only tolerate brief periods with temperatures in the range −18 to −12 °C (0 to 10 °F). As such, this generally limits hardy palm cultivation and long term specimens to hardiness zone 7a or higher. Some hardy palms can be cultivated in areas with low temperatures slightly below this range when given wind ...
In 2012 the USDA updated their plant hardiness map based on 1976–2005 weather data, using a longer period of data to smooth out year-to-year weather fluctuations. [7] Two new zones (12 and 13) were added to better define and improve information sharing on tropical and semitropical plants, they also appear on the maps of Hawaii and Puerto Rico.
The new data is based on 1991-2020 GIS data collected from over 13,000 weather stations.
Heather, Calluna vulgaris, one of Britain's hardiest plants (North York Moors) 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]
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