オサンポ walk - 八重桜や double cherry blossom

ソメイヨシノ散り
月と
八重桜咲く

Sakura flowers fell down
Then next, the moon and
The Double cherry blossoms have just bloomed

桜の季節はまだまだ続きます。
しかし…毎年のことながら、ほぼほぼ八重桜はソメイヨシノの後で咲きますね。お互いにどのような取り決めをしているんでしょう？
「一緒に咲くのだけは避けようぜ」「よっしゃ」

It's continuing Sakura (cherry blossom) season.
I really appreciate about their relationship between Sakura and Double cherry blossom. Every year, Doubly cherry blossom blooms after Sakura falling. They never change their rule. How do they decide it?
"Hey, don't bloom together"
"Alright"


*I’m not sure if my English grammars are correct.