Rhododendron puzzle 2010

Do you mean it's changed colour ?
Why do plants do this ????
I have anemones doing it :-((

The change is remarkable. See the next photo. I did not think they could change colour but mine was subjected to chemical spraying and I was wondering if that was why it had pink flowers last year. It should be pale cream. I know if plants are grafted on to root stock they can revert to the rootstock eg roses but this is not that. After I finish loading my photos I will go and find the name of this rhodo as that might help someone more knowledgable than me.