Howdy Vic;
Not trying to sound all upidy but almost with any seedbank's harvest claims, it all depends on if you don't stunt any growth/flowering through errors.
Growing them at the moment:
I've gotten a bit of salt build-up and nute burn and my girls (I hope) has just shot out what seems as white hairs on week....4 1/2.
It will definitely not be curable material in 4 weeks after.
Also with Jack47 being a bit complex (lineage) it's even more unpredictable... ;-/
Therefore, most people don't advise new-bears to try growing such a gnarly strain. crossed with AK/auto, it's even harder to predict how it will form as the days go by since it's a distinct hybrid. Supposedly bell-balanced (50-50)
It is my favorite strain though so I'm just gonna get some on-hand experience with'em from here on out. <3
Sorry for babbling kinda and hope this was somewhat helpful..... :dunno: