Plant selection and the American Zone System

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• Subject: Plant selection and the American Zone System
• From: "Greg Elton" g*@senet.com.au
• Date: Sun, 29 Jun 2003 08:26:10 +0930

I am a little confused with the zones used in mainly American
publications. My understanding is that they are used to indicate the
lowest temperatures that in all probability will be encounter for a
given zone and this is used as a guide to plant selection.
 
Whey then is a range of zones given for a given plant. If a plant can be
grown in zone 5 would it not grown in a higher numbered zone.
 
 I understand that there are maximum temperatures and humidity but the
zone system is a measurement of minimum temperatures.
 
Any help with this will be appreciated
 
Regards
Greg 
Adelaide  South Australia

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