(dumb) Question


This may be a dumb question but I bet there are other people who 
wonder the same thing:

If a plant is rated to zone 7, does that mean it does best in zones 
higher than zone 7 or lower than zone 7?  Can someone explain how the 
hardiness ratings work?  I've been a gardener a long long time and 
I've yet to get a clear answer to how this all works.

Thanks
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Nan Sterman
San Diego County California
Sunset zone 24, USDA hardiness zone 10b or 11

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