Question

1. What does the poet mean to say by the expression, "But this
alone won't do it'? ['But this alone won't do it feries​

Answer 1

Here 'it' refers to killing a tree.

Hacking and chopping cannot destroy a tree completely. They may inflict pain for the time being and affect the tree. But they won't kill the tree because its "bleeding bark' will heal itself. Then fresh twigs are sure to come out from it and develop into small branches. These fresh twigs that grow near the ground will develop to their former size if unchecked. The poet wants to mean that killing a tree is a difficult task because it also has a life which has been nourished for years.