Re: [CH] Miracle Gro

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Byron,

You're right.  The term we use now is Growing Degree Days (GDD).  For warm
season plants the formula is:

     {(High Temp + Low Temp) divided by two} minus 55 degrees F = heat units
(GDD)

If you know the GDD requirements for a species of plant, you can calculate
the time the plant should be reaching physiological maturity. 

Nels in ND
>
>As far as weather goes. About 20 years ago I was talking to an older County
>Agent from Coos County NH;  Zone 3A. He said he felt that plants also
>react to "Heating Degree Days", the same factor as used in calculating home
>heating fuels. 

>   The closest thing I have seen to his statement is "Days to Maturity
>depends on growing conditions"
> 
>>From a few miles north of you
>Where spring has sprung and leaking out all over the place.
>
>Byron
>
>
>
>

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