transplanting and growing room question please respond thank you

Ok i posted asking about how my grow looked and a couple said that even though i am a week into flowering I should change from my 1.5 gallon pot to a 3 gallon pot Just want to conferm with a couple more people to do that and was cureous if there is a fox farm nute combo to spacificly target root stimulation or should i just keep with the feeding scedule after they are transplanted?Another question if my plants are alredy 20 inches tall and the 3 gallon pot is 15 inches tall thats almost 3 feet my plants are big bud plants and i dont know if they should double or tripple in size during flower i have about 6 maybe 6.5 feet of grow room total that leaves about 3.5 feet is that eneuph grow room? or maybe i should start some LST on it if it gits a little to tall big bud is Big bud is 80% indica and 20% stavia

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i've grown in one gallon containers finish your grow in what your in now ..its supposed to be fun

if you want to transplant you can.. the more root space you give her the better she will be... but you dont have to...

if you start running into space issues you may need to tie your plant down... or however works to keep the height down..

it may reach 3 ft tall or so.. plus the foot of the pot will give you about 4 ft all together.. which should keep you within range of your room size...

keep up the nutes you are using.. dont worry about switching.. the roots will spread out on their own....

other than that good luck and happy growing

just keep your normal nute schedule but im not sure how transplanting goes a week into flower...and yes LST, chances are you'll run out of room. so yeah just start gradually tying her down bit by bit now. But i wouldn't start tieing right after you transplant.. compounding stress doesn't sound too good.