let a thousand flowers bloom

Etymology
A calque of 百花齊放，百家爭鳴 ("let a hundred flowers bloom; let a hundred schools of thought contend"), from various speeches made by  during the 1950s.

Proverb

 * 1) One should not interfere with promising developments in their early stages.

Usage notes

 * May be used ironically, in negative view of the aftermath of the.