a hundred flowers bloom (idiom); let the arts have free expression
Definitions (粵典–words.hk)
形容詞
形容各種花朵一齊盛開，繁華茂盛。比喻各種唔同形式風格嘅藝術或思想蓬勃發展。 all flowers bloom together; figuratively different style of arts or thoughts vigorously develop
Definitions (Wiktionary)
phrase, idiomatic
many different sorts of flowers bloom simultaneously
phrase, figuratively, idiomatic
a variety of different artistic styles flourish at the same time