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Re: A.d. Sprengeri

Responding to the message of <970325215215_109609429@emout02.mail.aol.com>
from seeds-list@eskimo.com:
> 
> Ive noticed something about the USDA zones. Those zones are very general and
> vague. Zone 9 in louisiana gets winter temps cold enough to kill A.d
> Sprengeri but Zone nine California is a good place to grow A. d. Sprengeri
> and it hardly is affected. We can grow things like fuchsia, bougainvilla and
> ive seen some indoor plants such as ficus left outside ( sheltered of
> course). Anyhow point is Sunset zones are more specific. Like my zone, 17,
> Major marine influece and winter temps get barely past freezing.)

We all sure wish there was something as specific as the Sunset zone system for 
the rest of the country, but alas, there isn't. The USDA zone map is based on 
average minimum temperature, period. There have been some attempts at other 
sustems, but none have caught on because of some flaw or other. The soils, 
precipitation patterns, humidity and local topography mean so much in using 
those zone numbers (the factors considered in the Sunset system), but at least 
it gives us a start. I can relate to a question or comment if I can at least 
associate it with a zone number.

Mary R. Henry
Dept. of Horticulture
U. of MN
phone: 612-729-9524
FAX: 729-1573
"We're all in this together."  USDA Zone 4a
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