'The peach tree is young and lush, its blossoms blazing bright' is often used to wish newlyweds well.
Tips
culture
The first line of 《桃夭》, a wedding song in the 周南 section of the 《诗经》. 夭夭 pictures a young tree in full flower, and the song likens the bride to it.
history
Swapping 桃 'peach' for its homophone 逃 'to flee' gives 逃之夭夭 'to run off without a trace', a pun now far better known than the line itself. Writers sometimes use 桃之夭夭 itself for running away, as a joke.
