Pink Hydrangea

Our hydrangeas are really blooming this year. Last year, a late April frost killed off a lot of the blooms but this year was a very moderate spring.

I believe these flowers reflect the pH of the soil where blue means acidic, white is neutral, and pink is alkaline. So this soil is more alkaline. I might attempt to change the pH of the soil around one plant and see if changes to white, blue or purple.