Question

Which line has been repeated in the poem The heart of the tree and why?

Answer 1

The line what does he plant who plants a tree? has been repeated many times in the poem to show the value of a tree and its importance.

Answer 2

Hi dear

The line which is repeated often in this poem is 'What does he plant who plants a tree'? 
It's because the poem makes us know the importance of trees and the need to grow it, so with this line we can understand it's importance for us and in what ways.

Thanks