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Re: temperature sum


 Ben,I believe what you are talking about are growing degree days.
In our area they start counting on March 15, probably earlier farther south.
A growing degree day is counted for every degree the average temp for a day
is over 50 F.  So if the average temp for a day
is 55 that would be 5 GDD.  A cumulative count is maintained for the growing
season.  Last year we nearly set a record because the weather warmed up so
early.  I would suspect that it should apply to
hostas as well as any other plants
Joanne
jopyz@earthlink.net
-----Original Message-----
From: zonneveld <zonneveld@rulbim.leidenuniv.nl>
To: hosta-open@mallorn.com <hosta-open@mallorn.com>
Date: Wednesday, February 17, 1999 7:43 AM
Subject: temperature sum


>Dear Hosta fans
>After all those boring dicusions on who named what and when I like to
>introduce you to the following I read. Plants( some, all?) flower
>when the temperature sum reaches a certain value The temp sum is the
>total of the temp (In C) of the day temp above zero starting from 1
>februar. It turns that flowering time correlates very well with this
>temp sum So say plant A flowers if the temp sum reaches a value of
>100 and plant B flowers when the temp sum reaches a value of 500 and
>so on. This is a quantatitive way of saying that it was a cold
>spring that delayed flowering.
> I dont know or this applies to hosta too.
>Ben J.M.Zonneveld
>Clusius lab pobox 9505
>2300 RA Leiden
>The Netherlands
>Zonneveld@RULbim.LeidenUniv.NL
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