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The hardiness scales do not take into account the reliability of snow cover in the colder zones. Snow acts as an insulator against extreme cold, protecting the root system of hibernating plants. If the snow cover is reliable, the actual temperature to which the roots are exposed will not be as low as the hardiness zone number would indicate.
Hardiness of plants is defined by their native extent's geographic location: longitude, latitude and elevation. These attributes are often simplified to a hardiness zone. In temperate latitudes, the term most often describes resistance to cold, or "cold-hardiness", and is generally measured by the lowest temperature a plant can withstand.
The plant thrives in USDA Hardiness zones 3 to 9 (you can find your zone here). Sea holly grows in a tall, clumping format, maxing out around 2 to 3 feet tall and 1 to 2 feet wide in its second ...
Hardy palms are any of the species of palm that are able to withstand brief periods of colder temperatures and even occasional snowfall.A few palms are native to higher elevations of South Asia where true winter conditions occur, while a few others are native to the warmer parts of the temperate zone in southern Europe, and others are native throughout temperate and subtropical locales in the ...
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 ...
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related to: hardiness zones by number