Re: CULT: question - frost heave

In a message dated 9/27/2005 2:56:05 P.M. Pacific Standard Time,  
appleb@cut.net writes:

I read  in some seemingly credible source (which I no longer recall) that 
iris  stop growing when the soil temperature gets below 40 degrees (F). 
By that  theory, it's not so much the frost or freeze that ends the 
growing season  (assuming the frost isn't so harsh it kiils the foliage) 
but the  temperature over a long enough time to get the soil that  cold.



Years ago, in the 70's, the Avante Gardener reported on some plants planted  
on Long Island, New York and the resulting root growth at intermittent time  
lines.  The resulting recommendation was that plants should be in the  ground 
for 6 weeks minimum before the ground temperature reached 45  degrees. (If my 
memory serves me right and no it doesn't always do  that)
George Mason in sunny (but not for long) Portland,  Or.

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