It is ok to do the leaves,
it's called a foliar feed..
will take up nutrition thru it's leaves,
especially when it's roots are disturbed..
*the poor guy/girl has to feed it's self somehow*
But never do a foliar feed in the hot sun..
It should only be done in the early morning hours,
or evening time *say around dinner, you don't want the plant
go to bed with wet feet/leaves really either*
But doing it in the hole is good too,
then where ever the roots are, they might be
able to grab some right at the time of planting..