Why do hydrangea flowers turn green. How do you turn back pink?

According to this article I found it depends on the pH of the soil. I personally like the green flowers which turn a light pink as they mature. However, my hydrangea is not a florist hydrangea and yours may not be either, but I think it still holds true about the pH. The article asserts that, "Hydrangea macrophylla -- Hortensia or Florist Hydrangea This is a commonly grown hydrangea with large globe-shaped flowers. It is frequently forced by florists and sold as an indoor pot plant during the spring season. Once moved outdoors, however, color is dependent upon the pH of the soil in which it is grown: blue if acid; pink if alkaline".

Here is the full article:

http://www.uri.edu/ce/factsheets/sheets/...



Try feeding it an acidic fertilizer for Camellias, Rhododendrons, or Azaleas.

Why do hydrangea flowers turn green. How do you turn back pink?
Add lime to the dirt around the plant.
Reply:In most species the flowers are white, but in some species (notably H. macrophylla), can be blue, red, pink, or purple. In these species the exact colour often depends on the pH of the soil; acidic soils produce blue flowers, neutral soils produce very pale cream petals, and alkaline soils results in pink or purple.

In most species the flowers are white, but in some species (notably H. macrophylla), can be blue, red, pink, or purple. In these species the exact colour often depends on the pH of the soil; acidic soils produce blue flowers, neutral soils produce very pale cream petals, and alkaline soils results in pink or purple.
Reply:amend the soil