Of course he will transplant before flowering,and maybe 2litre pepsi bottles would be best,you can fit several in a square foot,and plenty of root room for the entire grow stage in flowering! just something to think The bottle may not be big on the round but has a decent length to it even with the top cut off!,almost like a plant in a tube instead of a pot lol...good luck Harddon,look forward to checking out your updates...