classic waka stream

Following upstream
the drifting of fallen blossoms
along the water,
I found that in the mountains
spring itself had come to an end.

Meaning
Tracing the drifting blossoms upstream, I came in search of them, only to find that in the mountains even spring itself had already passed.
Commentary
Book II, Spring Poems (Part Two)

A poem composed when crossing the mountains near the end of the third month, upon seeing fallen blossoms flowing in a mountain stream.

Seeing blossoms drifting in the stream, the poet assumes there must still be flowers remaining upstream and ventures deeper into the mountains, only to find that even the signs of spring have already disappeared, expressing the passing of the season.
Author
Fukayabu
Source
Kokin Wakashu
Other