What are the themes covered in "Cut Grass" by Philip Larkin?

Cut grass lies frail:
Brief is the
breath
Mown stalks exhale.
Long, long the death

It
dies in the white hours
Of young-leafed June
With chestnut
flowers,
With hedges snowlike strewn,

White lilac
bowed,
Lost lanes of Queen Anne's lace,
And that high-builded
cloud
Moving at summer's pace.

High
Windows1971Cut grass lies frail:

Brief is the
breath

Mown stalks exhale.

Long, long the deathIt
dies in the white hours

Of young-leafed June

With
chestnut flowers,

With hedges snowlike strewn,White lilac
bowed,

Lost lanes of Queen Anne's lace,

And that
high-builded cloud

Moving at summer's pace.