I know that in some sense all trees have been changed by the One Tree which is now the 'invincible weapon of peace.' In that sense trees have seen their fullness in the Cross which was transformed from instrument of torture into instrument of life.
Just as the Tree of the Knowledge of Good and Evil once became the instrument of our death – so now the Tree of Life has become the instrument of our life. The Cross itself, and how we see it, is an excellent example. Before Christ the Cross could only be seen as an instrument of execution. After Christ we have to be reminded of its original use. After the Cross, all trees must be seen with at least a hint of their fullness." GTGFAT