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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
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