I don’t think you can spoiler on here, or I would have done it on my post.
The flowers are mostly there to show your progress, as you complete chapters you get blooms that are non-interactable, and as you complete endings you get the growing blooms that you saw when you got an early end.
If you want to remain unspoiled I suggest just playing as you’d play until you hit your first ending, and when you’re feeling stuck you can check the hints or come look up endings here.