wú xīn chā liǔ liǔ chéng yīn
lit. idly poke a stick in the mud and it grows into a tree to shade you
(fig.) unintentional actions may bring unexpected success
also written 無心插柳柳成蔭|无心插柳柳成荫
yǒu yì zāi huā huā bù fā , wú xīn chā liǔ liǔ chéng yīn
lit. you plant a garden and the flowers do not bloom, you poke a stick in the mud and it grows into a tree
fig. things do not always turn out as one would expect
well-laid plans may fail, and success may come where you least expect it