As I mentioned in my last entry, hydrangea is cherished flower by Japanese haiku poets.
I introduce one of the many haikus of hydrangea.
紫陽花や きのふの誠 けふの嘘
Ajisai ya kinou no makoto kyou no uso
Hydragea, a truth of yesterday, a lie of today.
This haiku was made by Shiki Masaoka, a famous haiku poet 100 years ago.
You can read about him in Wikipedia.
Hydrangea changes its color with its growth.
Green, white, blue, purple and red.
These all colors can be seen in one plant of hydrangea.
The transition of Hydrangea's color is slow but difficult to foretell and almost capricious.
So, Shiki used the hydrangea as a symbol of humans' fleeting "truth".