Analysis of Green Walls

I love all gum-trees well.  But, best of all,
I love the tough old warriors that tower
About these lawns, to make a great green wall
And guard, like sentries, this exotic bower
Of shrub and fern and flower.
These are my land's own sons, lean, straight and tall,
Where crimson parrots and grey gang-gangs call
Thro' many a sunlit hour.

My friends, these grave old veterans, scarred and stem,
Changeless throughout the changing seasons they.
But at their knees their tall sons lift and yearn -
Slim spars and saplings - prone to sport and sway
Like carefree boys at play;
Waxing in beauty when their young locks turn
To crimson, and, like beaconfires burn
To deck Spring's holiday.

I think of Anzacs when the dusk comes down
Upon the gums - of Anzacs tough and tall.
Guarding this gateway, Diggers strong and brown.
And when, thro' Winter's thunderings, sounds their call,
Like Anzacs, too, they fall…
Their ranks grow thin upon the hill's high crown:
My sentinels! But, where those ramparts frown,
Their stout sons mend the wall.