Clarence Mahan's comment on Schreiner iris

Clarence wrote that Schreiner's irises generally do alright in the 
east if you let them dry out a month before planting the huge 
rhizomes.  Clarence, can you explain why you let them dry out?  This 
seems contrary to what one would ordinarily want to do with any plant 
that is transplanted.  What does the drying out accomplish that makes 
for better survival, growth or whatever?

Arnold Koekkoek in NW Iowa
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