Re: Horn/ no Shelf

This just illustrates what makes trying to pin down the mechanisms of SA's such a challenge.  The variability due to pH alone, as Bill Burleson illustrated with MESMERIZER growing under a range of pH values, is only one of several factors that seem to alter SA behavior.  Fertility, temperature, soil to air temperature gradients--who knows?  They all may be factors.  To get at the variability due to genetic factors alone all those other parameters have to be held to a constant, something most of us just aren't going to be able to do as well as we'd like.
 
Thanks for posting the photo.  That is a particularly beautiful flower.
 
Neil Mogensen  z 7  western NC

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