USDA Zone
From BonsaiWIKI
The US Department of Agriculture (USDA) has divided the country into zones based on average minimum temperature. Some other countries have incorporated similar systems. This effort captures one important variable in climate that may determine how well equipped certain plants are to handle your winter.
Contents |
UNITED STATES:
- Easy lookup of your USDA Zone by Zip Code
- or see a map
EUROPE:
AUSTRALIA
Here is the "official page" from the USDA
- http://www.usna.usda.gov/Hardzone/
- An alphabetical index of indicator plants is available here, alphabetically, or
- by USDA zone.
When you review plant information on a garden site, catalog or book, you may see plants rated according to zone hardiness, suggesting which areas they can overwinter in safely. While zone information provides useful information, keep in mind that trees and shrubs listed as hardy in your zone may still require some protection in severe weather:
Trees in bonsai containers have less protection than those in the ground and are subjected to greater temperature extremes than their landscape counterparts which have their roots buried in the earth.
Zone info like this only applies to average minimum temperatures. It doesn't offer anything about the length growing season, amount of rainfall, or how hot, humid or windy it might be.
