Heard this interview on Freshair yesterday. ‘Margaret:’ Inside the ‘Fall’ Of a Teenager. Really interested in watching the movie. The director Kenneth Longergan also directed another movie that i loved, “You Can Count on Me”

The poem that was mentioned in the interview and apparently the reason of the title of the movie:
Spring & Fall: to a Young Child
by Gerard Manley Hopkins

Margaret, are you grieving
Over Goldengrove unleaving?
Leaves, like the things of man, you
With your fresh thoughts care for, can you?
Ah! as the heart grows older
It will come to such sights colder
By & by, nor spare a sigh
Though worlds of wanwood leafmeal lie;
And yet you wíll weep & know why.
Now no matter, child, the name:
Sorrow’s springs are the same.
Nor mouth had, no nor mind, expressed
What héart héard of, ghóst guéssed:
It is the blight man was born for,
It is Margaret you mourn for.