My interpretation of this is that the author was hoping for something futile - they 'grew a flower' (put effort or hopes toward) that can't be bloomed (is pointless or futile, will not produce anything) that can't come true (their effort/hope is just a hopeful dream). Basically, the author hoped for something that was not possible.
You could take a photo of you by a tree feeling happy or sad with colorful leaves falling and thinking bout something........idk
<span>Each of the characters bear a title of a person or event at an imaginary masked ball</span>
