25 gallon root ball, He should be hitting 2 lbs. I have done many 1 lbers in 10 gal pots. My buddy hit 1.5 last spring indoors on a heavy duty fruity using G.H. in a sealed environment with Co2 injection. Outdoors in Norcal, the going ratio is 40 gal/ 1lb. I am going to try some 200 gal...