RE: zone ratings

I'm very grateful for the heat zone map and refer to it often as it 
indicates the degree of difficulty folks in the North America may or 
may not have growing our delphiniums. These plants are very cold 
hardy but difficult to grow where day-time temperatures are 
consistently over 90degF for more than a few days.
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
Wanganui
New Zealand
~~~~~~~~~~~~~~~~~~~~
terry@delphinium.co.nz
http://www.delphinium.co.nz
~~~~~~~~~~~~~~~~~~~~
Proud to support World Wide Polio Eradication
You can help! See the web sites below:
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https://www.delphinium.co.nz/SeedsOfLove.htm
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On 9 Feb 2003 at 9:57, Donna wrote:

> I will leave the real answer to your question with the experts on this
> list..
> 
> But, living here in IL, zone5, I don't get the extreme heat, so I base
> my perennial plants on the old hardiness zones. I would think the newer
> heat index is for those in the extreme north and south. Some plants can
> not take the heat and others need so many days in the heat to bloom.
> 
> The only exception for me is some water plants. Some of them need so
> many days in the +90 which some years happens here, but some not.
> 
> I have not seem many (if any) that are labeled for the heat zone around
> here anyways.
> 
> Donna
> 
> > <<On the subject of zone ratings....they really are only a very rough
> > guide since a plants hardiness depends on so many factors >>
> > 
> > Could someone tell me how to use the new(er) heat zone ratings?  I
> have
> > seen
> > the map but don't have a good idea in my head about how to fudge one
> way
> > or the
> > other.
> > Gale, supposedly cold z6, heat z7
> 
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