I think 3 gallon is the sweet spot for autos. 2 gallons I'm seeing smaller plants and some deficiencies in late flowering. Though I normally have deficiencies(too much mixing soil while high probably)
5gallons should accommodate the bigger autos and fits nicely with 1 plant per square foot. With proper lighting, a little LST, and adequate soil, I averaged 2oz a plant.(500g/m2) and I see defficiecies, I overwater, underwater, overfeed lol. Not an expert here, just trying to get more organic bud.
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