If you plant flowers with your heart, you won't send them. If you don't send them, you can't help it. It seems that you have met Yan before.
Translation:
It is a very helpless thing to plant flowers intentionally and plant willows unintentionally, and flowers will always fall. The returning swallow is as familiar as an old acquaintance.
Source: Guan Hanqing's classic sentence of the second fold of "Waiting for Wisdom to Kill Lu Zhailang" is often remembered as "intentional flowering, unintentional flowering". This language was also included in the Qing Dynasty's revised "Zengguang Xianwen".
Extended data
Revelation:
"intentionally planting flowers" is a deliberate man-made process, and "unintentionally planting willows" is the result of natural fate. Cleverly, flowers planted intentionally will never bloom, but willows planted unintentionally can shade people, and the mystery lies in the difference between "intentional" and "unintentional".
The so-called "you" and "you" refer to the deliberate degree, not the "you" in the general sense. Therefore, "intentional" often points to efforts beyond nature (even to the point of demanding), while "unintentional" often points to casual encounters.
What you try to do often doesn't have a good result. Sometimes you just fiddle with something, and it often becomes a masterpiece. Unexpected things always bring unexpected surprises.
It also implies that people who are not valued often gain more than those who are valued. On the surface, it means that you don't care about this willow tree, but it grows sturdily. Its profound meaning is that it encourages people to be strong, confident and brave, making people a blockbuster.