Plant a pink hydrangea in acid soil and it may fade after a few growing seasons to washed-out blue. The hydrangea are all macrophylla cultivars. 'Parsifal,' a mophead that will turn blue in acid soil.

Daniel J. Hinkley discovered the double-flowered Hydrangea serrata, or mountain hydrangea, on a steep slope in South Korea, eventually named it Chiri-san Sue and introduced it to horticulture in 2000.

On the other hand, a pH level above 7.0 means the soil is alkaline, and will result in pink or reddish flowers. If the pH level is somewhere in between, the blooms are likely to be purple, or a ...

When I was in the 10th grade I learned how to change the flower color of the common garden hydrangea from pink to blue or from blue to pink.

How to change hydrangea petals to pink The next step is to check your garden soil pH level so you know what needs to be changed. Jill said a simple pH soil testing kit will be found at most garden ...