Speaking of "where there is no grass at the end of the world", most people think of falling out of love, after all, this is a common sentence when falling out of love, and it will also add a sentence that becomes "Where there is no grass at the end of the world, why bother to love a flower" This sentence does not seem to be wrong. But it is far from the original meaning. 
To find out what this verse means, we must first start with the author of the verse. This poem comes from the great poet Su Shi of the Song Dynasty "Butterfly Loves Flowers", when you mention Su Shi, you may think that this poem is definitely not about children's love. Because of Su Shi's ups and downs in life, Su Shi's poems also give people a kind of nostalgia and a great understanding of life. 
The original text of this poem is "The flowers fade and the red and green apricots are small, and when the swallows fly, the green water surrounds them." There are few willows blowing on the branches, where is there no fragrant grass at the end of the world? Swing in the wall, outside the wall, pedestrians outside the wall, and beautiful people in the wall laugh. The laughter gradually faded into silence, but the amorous but ruthlessly annoyed" This is Su Shi's subtle and graceful words after being degraded. 
At that time, Su Shi was excluded by the imperial court because of his opposition to Wang Anshi, and naturally he was not reused by the emperor, among which the layman outside the wall was Su Shi himself, and the beauty inside the wall was the emperor. In the end, "There is no grass at the end of the world" is about Su Shi's enthusiasm, but in the end he couldn't show his anger. 
Su Shi couldn't have imagined that thousands of years later, his words would be used to express the love of children, but at this time everything didn't matter.