The promise of a tree

I have been growing
In a fullness of absence
Each branch a challenge
And each leave a hope

Many winters behind
And a harder bark
I keep hearts and letters
Carved by lovers hands

I can be your shelter
When clouds break their promise
And I’ll be your shade
When your sun is too bright

And if you forget me
I’ll turn into pieces
And one day I’ll be fire
Warming your heart.