Prefer Blue Hydrangeas? - Pasquesi Home and Gardens
blog FAQ, changing hydrangea colors

Prefer Blue Hydrangeas?

The only hydrangea variety that you can change the flower color is the Big Leaf Hydrangea (Hydrangea macrophylla) also known as French, mophead & lacecap or Mountain hydrangea (H. serrata). You can change the color from pink to blue and vice versa by raising or lowering the pH of the soil by adding Bonide Aluminum Sulphate or Espoma Organic Soil Acidifier. 

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