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I have not grown in soil indoors for the last 10 years. I have a bad back and cannot move heavy pots around. Pumps do all the heavy lifting now. It would seem to me that 3 gal. for an auto should be plenty but research it in the soil grow forum.@Mañ'O'Green BTW, what size pots would you recommend? I'm thinking 4, 5 gal pots in a 4'x4' for a first time.
A trick when you start in a big pot is to water just around the edge of where you think the roots are. Shallow at first and then just increase the diameter and deeper as the plant grows. By the end of 14 to 20 days you should be watering the whole pot to about 10% runoff.