color change

I'm a novice gardener, and I transplanted blue irises that were next 
to the house to a new location.  When they came up this spring they 
were all pale yellow! The new location has several evergreen trees 
close by so I'm wondering if a more acidic soil could have caused the 
color change.  There's more shade in the new location, although they 
do get some direct sun.  I'm live in Duluth, MN.

Also, I planted them a bit too deep, and although I don't think this 
affected the color change, I am concerned about the longer term 
problems that could result from this error.  so i have two questions:

1.  Is it common for irises to change color from blue to yellow in 
different soil or other environmental conditions?
2.  What are the long term effects of planting irises too deep, and 
should I replant them this fall?

Thanks!


 

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