A pink hydrangea in Brittany, France. In most species the flowers are white, but in some species (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these species the exact colour often mirrors 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. Species in the related genus Schizophragma, also in Hydrangeaceae, are also often known as Hydrangea and Hortensia

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