heat zones, delphinium, etc.

<<There are all sorts of other factors come into it like humidity, night 
temps, local climate etc, but the heat zone map is definitely a useful 
aid to us. I can see that Donna's ideas about accumulated heat day 
requirements for plants would make the map very useful too.  - cheers
Terry Dowdeswell
Dowdeswell's Delphiniums>>

Hi Terry,
I used to grow lovely delphiniums here in Tennessee when I lived on top of the 
Cumberland Plateau - temps are consistently 10 degrees lower than valleys 
because of 1000 foot greater elevation.  We also had sandy soil.  I grew them 
against a south facing wall - but when we moved the wall in remodeling I was 
never able to get them established again.  And here in Nashville it is 
hopeless!  Brick-like soil and many days over 100, hot nights and humidity and 
month long droughts.  I have heard of putting ice around the crowns of cool 
loving plants every day but have never tried it.  So you see a heat zone rating 
would be very useful here.

If a plant is rated heat zone 7, does that mean it won't grow here if the 
number is higher?

Gale Link

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