U.S.D.A. Zones

TreeBay

The US Department of Agriculture (USDA) has divided the country into zones based on average minimum temperature. Some other countries have incorporated similar systems.

Many of our bonsaiTALK members have modified their profiles to include growing zone information so that anyone who reads their posts, advice or questions can consider their environment.

UNITED STATES:
Easy lookup of your USDA Zone by Zip Code
or see a map

EUROPE:
http://www2.dicom.se/fuchsias/eurozoner.html

AUSTRALIA
http://www.anbg.gov.au/hort.research/zones.html

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 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 pots 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 soil.

Zone info like this only applies to average minimum temperatures. It doesn't offer anything about the length growing season, rainfall, or how hot, humid or windy it might be.

Regards,

Matt

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