Iris setosa

Can they change colour Siris? My 'Baby Blue' is bigger and darker this year and it's never been moved from it's pan. I did split it a couple of years ago though and have a couple of smaller offshoots in a pot. No sign of flowers on them this year.

my setosa alba is one of the purest whites I have. but no flowers yet this year.

Thanks Seaburng, I was not aware there was a white setosa.
Thorney, the colour tone can fade during the day, also from year to year how well they have been fed etc, but I wouldn't think from blue to white. I'm not sure mine has flowered before, it's just the label that says Baby Blue, i like it in white.