Question

name the plant harmone that inhibits growth and also helps in wiliting of leaves

Answer 1

absisic acid hormone it is the growth inhibitor

Answer 2

HI !

Abscisic acid (ABA) is a  plant hormone which functions mainly as a growth inhibitor. 
Abscisic acid promotes the dormancy in seeds and buds [ this is the opposite of breaking the dormancy]. 
It also promotes closing of stomata. 
Abscisic acid promotes falling and wilting of leaves