What strain is it?

No way to tell what it really is, but true Jack Herer has 4 different phenotypes............ Try the Sensi Seeds website for a full description. Can tell though that your plants are waaaaay over fed, hold up on the nutrients for at least two weeks would be my suggestion. They need to use up what is already there before any new nutrients are given. The super green colour and the plastic looking leaves are the give-away signs.

Yes that's Jack Herer. Cheers!

Only thing for sure is that its an autoflower and looks to be getting overfed. You will see more expression in flower and maybe one will smell different then the other. This is not always the case as with similar smelling strains. Grow it out and hopefully it will become clear with time. Good Luck!

Wel the other two on your diary look sativa to me but this one looks like messed up genetic indica to me. Most of thoose leafs only have like 1-3 side leafs on them instead of like 7. I think no one can see what kind of stain it is, at least i never met someone that could. We can only see if it is indica, sativa, hybrid or ruderalis. Good luck growing :)