iris change color over time?

I have been told by older gardeners in my area that iris will change
color - usually to white - if several varieties are grown in the same
bed.  I don't believe this.  Personally I think the most hardy variety
will eventually take over the bed as the lesser hardy varieties die out.



But I need to know if I am right or wrong and I need to be able to back
up my answer - one way or another!



I'd appreciate any information.



Suzanne Butler

Chillicothe TX

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