Just go to Sannie's site opengrow.com everything you wanna know is there.
I've grown killing fields f2 a couple of years ago. Dank! Two phenos showed up. Had the purple one sweet grape type flavor flowered long. Had the green pheno shorter plant fruity sour funk, faster flowering I think it was something like 8 weeks. The green was more dank had a nice body stone to it. Loved them both. Purple one will make you rich though.
Haven't grown jackberry cuz I have those genetics separately. I'm sure its fire though. No longer run kf cuz of the flowering time but, that's just me. If, I could I would. Anyway, I do have killing kush and kf x madonna. Madonna is my favorite. When I pop those beans I'm selecting the purple phenos if, I find them cuz the bag appeal alone will make you rich. Let alone the genetics will produce straight flame cuz the parents are tremendous on their own.