We start with a profusion of pink flowers (see Sekiyama). And then the flowers fall like snow. Spring offers us this teaching every year.
"Only the Buddhas and Ancestors realize the blossoming and falling of flowers in the sky, flowers on the ground, realize the blossoming and flowering of the world and so on; only they know that the flowers of the sky, the ground, the world are sutras.
Nirvana and birth and death are just flowers in the sky".
Kuge: Flowers in the Sky, Shobogenzo (Treasury of the True Dharma Eye)
Eihei Dogen (1243).