Because of its abundance of flowers and its shape, some connect the hydrangea to boastfulness. Others suggest that this plant is a symbol of gratefulness and heartfelt feelings.
It symbolizes vanity and frigidity. It is a symbolic way to say "Thank you for understanding"
In China, the hydrangea is associated with enlightenment. It is said that when observing the plant, someone can get lost in its abundance of beautiful petals very easily. This also connects to becoming lost in one's thoughts, and reaching enlightenment.