+0
(1)story:

"many years ago one tried to grow a tree.but the tree finally died even treated very well by him ,but the other day,he put a seed into the soil,and several years later,the seed becomes a tree"

(2)explanation:

if we want to find something/get someting ,it never come to us,

but ,if we don't pay much attention to it,and let it be,the thing we want will come to us naturally.

(3) question: how to express this meaning in an idiom?

Thank you in advance.

ps: I hope i make myself understood...:-)
+0
A watched pot never boils. Good things come to those who wait.

Not quite your requested meaning though. I'm not sure we have one idiom that covers both ideas.
+0
We have a nursery rhyme:


Little Bo-Peep
Has lost her sheep
And doesn't know where to find them.
Leave them alone
And they'll come home
Wagging their tails behind them.
MrP
Site Hint: Check out our list of pronunciation videos.
Comments  
Thank you!
 MrPedantic's reply was promoted to an answer.
Students: We have free audio pronunciation exercises.