According to accounts of the Buddha's life, it would seem that he had a very deep relationship with nature. He was not born in the royal palace but in a park, under a sala tree. He attained complete enlightenment under the bodhi tree and left this earth to enter Parinirvana, again, between three sala trees. It would seem that the Buddha was very fond of trees.
True enlightenment is nothing but the nature of one's own self being fully realized.
Through meditative techniques, one can free the mind of delusions and attain what we call enlightenment.