well you should use at least 1 gallon pots but i would recomend 3 gallons. 5 is better but takes up alot of space. you should get new pots of your choice 1 or 3 gallon 3 being best and transplant each plant individualy. they might suffer for a while and look droopy or slow dow frowth after the transplant but they will bounce back way better and your yiel will increase dramaticly.