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i dont think size matters much as far as quality and health of your plant goes.but i hear auto's are going to be a tad smaller regardless. making them ideal for "bonsai" grows. which would be put in small cups/pots. just as long as you have room for desired root growth i think anything is fine. 3-4gallon-ish per plant, but since it's auto maybe a bit smaller. since they do have ruderalis genes.