Thuja Gardens - Hardness Zones Locator
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What Is Your Hardness Zone? What does this mean?
The US Department of Agriculture produces a map for gardeners based on the average of low
temperature readings taken from weather stations throughout the United States.The idea is to give the
garden industry a way to communicate the cold hardiness of landscape plants. That is why the tag of a
holly or any other landscape plant often says Hardy in zones 5 to 8 - This means this plant will grow in
zones 5,6,7,and 8. Not under 5 and not over 8
The Plant Hardiness Zones divide the United States and Canada into 11 areas based on a 10 degree Fahrenheit difference in the average annual
minimum temperature. (The United States falls within Zones 2 through 10). For example, the lowest average temperature in Zone 2 is -50 to -40
degrees Fahrenheit, while the minimum average temperature in zone 10 is +30 to +40 degrees Fahrenheit.
Suggested hardiness zones have been indicated for all trees and perennials available online from the Foundation.If a range of zones, for example,
zones 4-9, is indicated, the tree or perennial is known to be hardy in zones 4, 5, 6, 7, 8, and 9. Suitable hardiness means a plant can be expected
to grow in the zone's temperature extremes, as determined by the lowest average annual temperature.
Planting is a long-term investment, be sure the plant you choose is hardy in your location.
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