I put the transplants into 2 gallon pots. That should give them plenty of root room. When I put them into one gallon pots to root them, I will plant them up into two gallon pots. Most of the videos I've watched show them in 2 gallon pots. I've run out of 2 gallon pots, so, they will just have to over winter in the one gallon pots. I'll try to keep the green house warm this winter. Closing the door screen, and such.