Punica :Expert advice needed
 

HI
I made a cutting 3 years ago from a double red flower Punica I
selected the branch when flowering and cut the following autumn.

The cutting is normally growing but no flowers..

A gardner told me that a cutting from a tree needs to become mature
before making flowers..
It seems to me that a cutting from a mature tree should have exactly
the same caratheristic as well as maturity ( sexual) as the parent
tree..
any suggestion from personal experience or read somewhere
something ?
Might be a punica an atypical example ?
Thanks a lot
Theo