What are the places where nature is used in the description and what it is being used to describe in "La Belle Dame Sans Merci"?

You might want to examine how nature is used to reflect
the emotional and psychological desolation of the knight as he is left "Alone and palely
loitering." Note the way that the action of the poem is placed in a specific context
that indicates a certain season:

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"The sedge has withered from the
lake,

And no birds
sing."

And then again in the
second stanza:

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"The squirrel's granary is
full,

And the harvest's
done."

Note how we are at the
very end of Fall and Winter is beginning. The squirrel has done all of its work to
prepare for the cold, dark months ahead, and likewise the harvest is all over. All the
sedge has "withdered" from the lake, and the birds are silent. This of course reflects
the winter that is in the knight's soul after his experience with the strange woman that
has bewitched him. Note in particular the detail of the sedge "withering" and how this
is repeated at the beginning and the end of the poem, indicating how the man himself has
"withered" thanks to the enchantment of this woman. Thus nature is used to reflect the
desolation of the knight.