If the weather is warm, peppers will grow fine when 6-pack size plants are planted in the garden. Mechanical transplanters for large scale use often require a very small plant to fit through the machine.
Pot size for me is more about holding time until being planted. A larger pot gives me another two weeks or so of time. A lot of my plants in my own garden are planted out of 4" pots. I actually think it is the extra Osmocote in that root ball that is the biggest benefit of the 4" pot.
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