This hydrangea started out with lavender colour blooms. The flowers are now changing into lots of different vibrant colours. What wonderful shrubs hydrangeas are.
@kjarn I think hydrangeas change from pink to blue depending on the soil. I think these heads are changing as the flower is coming to the end of its life. The flowers usually turn to brown at the end of the season. This plant seems to be going through lots of changes before it turns brown.