Purple based foliage


Hi, all:

I know there was a discussion on this a month or so back, but I don't 
remember enough. Today when I was planting some rhizomes a friend gave 
me I noticed how very purple-streaked some of the foliage is on these 
older, unnamed cultivars (unknown to friend -- I just have her 
descriptions of blooms.) 

Anyway, what *is* the significance of purple based foliage on iris?

Marte in the mtns	Zone 4/Sunset 1  Colorado	Rainy & coooool!



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