"Yellow Flower Cold" evolved from "butterflies in yellow flowers, and tomorrow will be sad". It is only because Su's poems are too elegant for ordinary people to swallow dates, so he spread the wrong message, first turning yellow flowers into "yellow flowers" and then into "cucumbers".

The reason for this misunderstanding is that the word "butterfly" also has certain joint responsibility. Isn't it homophonic with food? So Dongpo's "yellow flower" finally became "cucumber dish" and was put into "dish". It's "cold" if you come late!

In addition, there is a tradition in the north, the last course of a dinner party is day lily, saying that the day lily is cold, even if it comes late, the banquet will be over.

Extended data:

Cucumber is cold, which is a common saying, and it is a mockery and criticism of people or things who are late. Cucumber itself is cold. If the cucumber is cold, it means that it is too long and too late, which is both criticism and ridicule, and does not hurt people's face.

The day lily is cold, which means that the host and guests sometimes forget the last dish, so some guests will say, hurry up, I'll wait until the day lily is cold! The extended meaning is: waiting for a thing or a person for a long time is like waiting for the day lily on the vegetable table to get cold.

There is a tradition in the north that the last course of a dinner party is day lily, saying that the day lily is cold, and even if it comes late, the banquet will be over.

References:

The day lily is cold-Baidu Encyclopedia