Hydrangea.

They are a wonderful flower.
They can range in color.

White

Green

Blue

Purple

Pink

There are so many hue variations.

You can even find some multiple colors on one bush.
This is in Japan. A lot of different hydrangeas, and different soil types.

The color is affected by the pH of the soil.
To get blue Hydrangeas to turn pink, one can amend the soil with lime to make it more alkaline. So it would seem that the soil pH changes right under these bushes! This photo shows that even the flower head itself is two different colors