It's not a tough one CC, I treat mine pretty hard, full sun (under poly and shadecloth in summer though) and I do find them quite slow. As I mentioned be very wary of the water as they do split quite easily. The bigger one with the buds just forming split after the first water last season. It's survived, but that might be why it's lagging behind the other..
These are a little over 4 years, but I got my first flowers on them last year so 3 years seems to be the flowering age.
Good luck with yours!