Keats, not actually picking out celery in so many words, but plainly including it in the general blessings of the autumn.

From A word for autumn by A.A. Milne.

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.

[snip]

But now, suddenly, I am reconciled to autumn. I see quite clearly that all good things must come to an end. The summer has been splendid, but it has lasted long enough. This morning I welcomed the chill in the air; this morning I viewed the falling leaves with cheerfulness; and this morning I said to myself, “Why, of course, I’ll have celery for lunch.” (“More bread, waiter.”)

“Season of mists and mellow fruitfulness,” said Keats, not actually picking out celery in so many words, but plainly including it in the general blessings of the autumn.