CULT: heat zones

While at Mouse Creek Perennial Nursery last week, I saw a heat zone map
that I thought was interesting.  I thought our summer temperatures were
hotter than a lot of other USDA zone 7 areas, but hadn't realized how
much longer it stays hot here than, for example,  Oregon west coast.

My computer crashes pretty easily on a lot of websites designed for
higher speeds and more memory, but I found this one for North Carolina.
Explains some of the vale problems.  May explain lack of borer survival
here - summers stay hot too long.

from
<http://www.ces.ncsu.edu/depts/hort/consumer/weather/heat_zones.html>

<The  American Horticultural Society has developed a Plant Heat Zone Map
that includes 12 zones based  on the number of days the temperature
rises above 860F.

 Many of our gardening books were written for English gardeners or for
those in the northern section  of the US. Plants that are reported to
grow well in a cooler climate may or may not due well in the  south. One
of the biggest problems with temperatures in the south is warm nights.
Plants produce food during the day and breakdown food (respiration) day
and night. During cool nights respiration slows but during hot nights
respiration is significatenly higher. Thus high night temperatures
cause  lower food reserves. >

--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.korrnet.org/etis>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
photos archives: <http://www.hort.net/lists/iris-photos/>
online R&I <http://www.irisregister.com>

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