Why Are My White Hydrangeas Turning Pink?

Changing Hydrangea Colors

You see, for most French hydrangeas (Hydrangea macrophylla), the flower color indicates the pH of the soil. In strongly acid soil (pH below 6), flowers turn blue. In alkaline soil (pH above 7), flowers turn pink or even red.

How do you stop white hydrangeas turning pink?

However, when white hydrangeas get older they can turn blue or pink at the tips. You can try to prevent it by using a well-balanced fertilizer that is low in phosphorous and keeps the acidic levels down. You may need to fertilize in the spring or summer if the soil pH levels need adjusting.

Do all white hydrangeas turn pink?

Adjusting the soil's pH is how you can change the color in these blooms between pink and blue. These flowers can look white as the color fades, but you cannot turn a true pink or blue Hydrangea into a true white Hydrangea. The opposite is also true; a true white Hydrangea cannot be changed to pink or blue.