How are Hydrangea flower colors determined?
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The flowers of many hydrangea cultivars run the gamut of colors from pink to purple to blue. Some newer cultivars are “chameleon” hydrangeas, whose colors change throughout the season. All of these colors are due to pigments called anthocyanins stored in the sepals. The internet is full of advice—often conflicting—on how to force color changes in hydrangeas. This publication will discuss how hydrangea colors are determined and the best ways for home gardeners to care for these striking shrubs in their landscapes.