A flower has an ability to add beauty to the unattractive things in the world.
Bougainvilla is used because it seems that they are not given much attention. Only a few people realize that the leaves around the flowers of the Bougainvilla brighten up the place, making it more attractive. Only a few people realize that a flower is powerful. Without them, a place looks boring.
(c) Vyankka Balasabas