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Hydrangea have opposite leaves and large, flat-topped or rounded clusters of white, pink, or blue flowers. Interestingly, unlike most other plants, the color of their flowers can change dramatically. To change a hydrangea from pink to blue you have to add aluminum to the soil. Changing from blue to pink means subtracting aluminum from the soil.

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Spotted by

Płock, województwo mazowieckie, Poland

Spotted on Aug 4, 2011
Submitted on Aug 10, 2011

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