Pot size...transplant?

i have 4 ladies in pots that are 6 inches widse and 8 inches deep. the plants are 16 inches tall. i am planning on going ot flower and dont kno if i need bigger pots for them or not. if i do how do i transplant? and if i dont, how big can the plants still get? thank you

im a first time grower, and eveeryone will say to transplant into bigger pots, im about a month into flower with the same size pots......... i guess well see what happens

hmm yeah i wonder. cuz it seems like the stems kinda stopped growing..and they aint gettin much taller. so i plan on buying my 400 watt hortilux hps now and swithcing over...seeing whose male then practice transplanting the males before the ladies...haha hope all goes well. thnx

put them into 3gallon or better yet 5 gallon buckets

at least twice the size, a but bigger if you have achoice