when to transplant and to what size

Hi,

I'm growing in a greenhouse. My plants are in 1 gal containers now, and they are 8 - 12" and seem healthy (no discoloration, good growth.) They are in FOXFARM ocean forest soil, using a heavy feeding of foxfarm growbig 6-4-4 every other watering.

As they are growing quickly I would like to prepare for the next transplant (if necessary.) At what size do you recommend transplanting out of the 1 gal? What size container do you recommend for flowering?

Any other relevant advise?

I am experienced with hydro/indoors but this greenhouse/dirt grow is new to me.

Kind regards,
S

aloha. I'm not the most experanced either but I have been transplanting when the growth of the plant is taller then the container itself. if your container is 8" high and your plant is a foot or more, you need to transplant. your roots need the room to spread. try not to transplant more then 3 times, because everytime you transplant, your baby goes into shock for a few days. from a 1 gal. pot, I would either go with a 3 or 5 gal. depending on how big your gonna let it get. I hope this helps but then again ,someone else might have a different veiw. good luck. aloha