For now it's for plant size management and also not using as much soil. Also the 2 gallon sized pots are more then adequate to see an auto through to finish. I have grown 3,5,and 7 gallons . The larger sizes can grow monsters.Hey lilm00re14 , just wondering, since your getting such great results from the 2 GAL why not go 3 or 5 even. Most likely a space thing I would guess, but I think if you had dramatic differences between one and two then why not 3 gallon?

But sometimes seem to take a little while longer finish . So plant management and also I can fit more 2 gallon pots in my 4x4 then I can 5 gallon pots.and the spot where I begin new plants can fit (12) 2 gallon smart pots perfectly under my T5 =)