Barto

With your logic, a plant grown in an endless pot (outdoors in a field) will grow to the moon. Yes pot size matters to a certain extent but once you get past 7 gallons or so you won't see a larger plant because the root span is limited. Plus the growth / size is dependent on strain. Most Indicas won't get very tall regardless of the pot size, most sativas will. You can't lump them all into a chart (even in a generalized sense) and say this size pot will yield this much growth. Pots 10 gallons and up are a complete waste for most strains, though I get it's easiest to say 'when in doubt go big.'