Hydrangea

[goldwolf]

We have this Hydrangea 5 year old, It has always had pink flowers but this year it is two coloured been pink and blue, it is planted in the garden and has not had anything different done to it, any one know the reason, thanks

[shushkin!]

We have this Hydrangea 5 year old, It has always had pink flowers but this year it is two coloured been pink and blue, it is planted in the garden and has not had anything different done to it, any one know the reason, thanks

That is interesting. My first thought would be that something has gone into soil around it to make the soil more acid. It can't be wood ash as that would make it more alkaline.
Did you mulch the soil around it earlier in the year and what with?
Have any other acid sensitive plants in your garden changed at all?