I have all of mine in solo cups and a fee in 1 gal pots..hard plastic...IL take them from the solo cups soon to the gal pots or I might just order 3 or 5 gal pots ...I like to get the roots right to the outside of the pot before they start getting too wrapped around the the outer perimeter of the soil of course...I should probably let it get a better rootball than what I usually do but I get too pariniod that it will stunt the plant because the roots want to expand and just circle instead of stretch ...tbh I would probably want to transplant one of my plants in about a week but I'm prob not gonna be able to...it's a bag seed plant but this fucker is growing like.....A WEED