Flower Color on Hydrangea - Knowledgebase Question

Naples, FL
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Question by robh
April 15, 1998
Does the hydrangea require acid soil in order to produce blue blossoms?

Answer from NGA
April 15, 1998
Yes! The flower color is determined by the availability of aluminum in the soil. In alkaline soils, the aluminum in the soil is in a form that is unavailable to the plants. In soils with a pH of 7 to 7.5, expect pink flowers. In acid soils, the aluminum is in a form that the roots can take up, so in soils with a pH of 4.5 to 5.5, expect blue flowers. In between, in soils with a pH between 5.5 and 7, the color will range from bluish to mauve to pinkish. (This of course refers to colored varieties of Hydrangea macrophylla. There are also white cultivars.)

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