Dahlia

I bought this dahlia last year and didn't dig it up over the winter so I thought I had lost it. However, it surprised me by emerging out of the ground a few weeks ago. It has just started flowering and has amazed me even more by being a different colour! Last year it was a beautiful lemon yellow with red streaks and this year it is decidedly a peach colour! 
I posted last year's flower on 24/6 so it is much later this year.