Here is the Japanese song about which you speak (and, no cherry blossoms specifically mentioned). Maybe there are two different songs? Although the first couplet is exactly the same as in the one with English inserted...

This hauntingly beautiful melody comes from the Sendai area in Tohoko district and can be classified as a tedama (ball juggling) and counting song.

Hitori de sabishii (Alone and Sad)

"Hitori de sabishii,
futari de mairi ma sho.

Miwatasu kagiri,
yomena ni tanpo.

Imôto no sukina
murasaki sumire.

Nanohana saita
yasashii chôchô.

Kokonotsu komeya
tô made maneku."

Literal translation:
"I feel lonely all by myself.
Shall we two go together?
As far as the eye can see there is grass and dandelion.
We can also see the violets my younger sister loves.
The flowers bloom and beautiful butterflies flutter about.
The rice shop welcomes us."

From "Folk Songs of Japanese Children", compiled and annotated by Donald Paul Berger, Charles E. Tuttle Company, Rutland, Vermont & Tokyo, Japan, 1969.