Do irises change colour over time?

[jessmorris]

I bought some hugely expensive irises from somewhere in Suffolk a few yaers ago - they were pink, orange and brown&yellow. The brown&yellow ('Provence') are the first to flower and they are now dark purple! The irises I bought as dark red have come up and flowered as the palest grey - probably just labelled wrongly. has anyone else had irises come up a different colour from the previous year?

[tamsin]

Are the original irises flowering or have they set seed and the crosses are now flowering?

[jessmorris]

I think its the originals. I'm very puzzled by the whole thing.