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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.
The PPQ works to safeguard agriculture and natural resources in the U.S. against the entry, establishment, and spread of animal and plant pests, and noxious weeds in order to help ensure the protection of native flora and an abundant, high-quality, and varied food supply.
The new data is based on 1991-2020 GIS data collected from over 13,000 weather stations.
It is great that the USDA has made its own conception of plant hardiness zones in Canada, but the relevant source for Canadian zones is really planthardiness.gc.ca, from Natural Resources Canada. This exists only in a link at the bottom of the page, but it should be written about in the North American section of the article.
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. Gardeners, take note! The USDA released a new hardiness zone ...
Here's how the USDA Plant Hardiness Zone Map helps you determine which plants are most likely to thrive in your garden. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please ...
The National Institute of Food and Agriculture (NIFA) is USDA's primary extramural research funding agency. Its mission is to advance knowledge for agriculture, the environment, and human health and wellbeing by funding targeted research, education, and extension projects and programs, some of which are specific to the Land-Grant University ...
USDA plant hardiness maps, updated for the first time in a decade, show a 2.5-degree Fahrenheit increase in temperatures across the contiguous U.S.