In different types of soil hydrangea petals differ in colour, giving rise to the nickname 'shichihenge' (七変化 '7 transformations').
Throughout history the warrior class shunned the flowers, considering hydrangea to symbolise fickleness and a change of heart or loyalties.
While it is unproven, many people believe hydrangeas originated in Japan.
The Japanese name 'ajisai' (紫陽花), meaning 'gathering of blue' (aji/atsu 集まる = gathering/ai 藍 = indigo), suggests the flowers were originally mostly blue in colour.
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