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Blue Bigleaf Hydrangea (Hydrangea macrophylla). Flower color is determined by the availability of aluminum in the soil. In acid soil, aluminum is readily available, flowers are blue. In alkaline soil, aluminum is less available, flowers will be pink. | by Swallowtail Garden Seeds
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Blue Bigleaf Hydrangea (Hydrangea macrophylla). Flower color is determined by the availability of aluminum in the soil. In acid soil, aluminum is readily available, flowers are blue. In alkaline soil, aluminum is less available, flowers will be pink.

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Taken on May 17, 2014