In what ways does Esperanza identify with the four skinny trees?

Esperanza identifies with the trees because of their strength and tenacity.

"When I am too sad and too skinny to keep keeping, when I am a tiny thing against so many bricks, then it is I look at trees. When there is nothing left to look at on this street. Four who grew despite concrete. Four who reach and do not forget to reach. Four whose only reason is to be and be"