Ive been growing Jack Herers for a while now and their the only strain I grow. These plants are useless trying to grow them small or in the Sea Of Green format, 31 inches is ridiculously small for the Jackers. The first time I grew them I got depressed thinking what a waste of everything, that is until they grew like trees while blooming, literally tripled in size reaching over two metres in height. Ever since then I treat them like trees, each pot almost one metre away from the next with alot of string to hold the suckers down. All those websites say itll yeild 120 grams and to top the bullshit factor in they also say if its nurtured well, I fell for this seed company owners comments. Now the part you want to hear, each tree yeilded around 450grams dried weight, once I hit just over 500grams, just once. Doubling the vegging to lets say 2 months would pull a few pounds easily.
My set up is childs-play.
25 and 35 litre pots, the bigger pot the better the plant the bigger the yield.
Coco medium, cant go wrong, better than all that perlite and vermiculite crap.
Drip to waste system, the trees get fed with clean nutrients, but its costy.
Coco Nutrients, Dutch glory - cash crop Shiva a&b with the shit loads of additives that comes from the same company are my favorite.
Veg them for 4 weeks, they should be around one metre in height. Bloom them for 8 weeks minimum, you have no option anyway, they mature like a slug. At this point they should be like a tree almost touching the ceiling, tie them down as soon as they hit the lamps, I burn 1 in 5 lol, thats because I dont dedicate much of my life schooling the suckers. This strain does not have the centre bud like the rest of strains, they grow a crown like centre tip. the buds are all in its arms. Feeding them is 4 times a day (6am, 12pm, 6pm, 12am) feeding no less than 1 litre each, gradually increasing the amount to 4 litres as they grow large, again alot of nutes and water is used (5 litre nutrients is empty after 12 weeks or veg and bloom for 3 plants).
Hit me up if you want me to explain.