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It sounds as though the second quotation is taken from this passage by A.A. Milne, in Not that it matters (1919):

Last night the waiter put the celery on with the cheese, and I
knew that summer was indeed dead. Other signs of autumn there may
be--the reddening leaf, the chill in the early-morning air, the
misty evenings--but none of these comes home to me so truly.
There may be cool mornings in July; in a year of drought the
leaves may change before their time; it is only with the first
celery that summer is over.

I knew all along that it would not last. Even in April I was
saying that winter would soon be here. Yet somehow it had begun
to seem possible lately that a miracle might happen, that summer
might drift on and on through the months--a final upheaval to
crown a wonderful year. The celery settled that. Last night with
the celery autumn came into its own.

There is a crispness about celery that is of the essence of
October. It is as fresh and clean as a rainy day after a spell of
heat. It crackles pleasantly in the mouth. Moreover it is
excellent, I am told, for the complexion. One is always hearing
of things which are good for the complexion, but there is no
doubt that celery stands high on the list. After the burns and
freckles of summer one is in need of something. How good that
celery should be there at one's elbow.

http://www.gutenberg.org/cache/epub/5803/pg5803.html

https://archive.org/details/notthatitmatters0000miln/page/60/mode/2up