For soil might be different than for oyher mddiums. Eventhough in coco vonditions are dimilsr. I would recommend aerating youf doil a bit more. Adding amendments like perlite, grow rocks, of even pebbles might hrlp with drainage snf mskd youf root s grow in search oc moisture and nutes. Thus icreasinI have been using about 3 gallon pots for a few runs, and I have found, unless you veg the plants for a fair while, the roots don't use up much of the pot.
The roots are the size of the previous smaller pot they were in, and haven't spread out much into the bigger pot.
Which makes me wonder why I use a bigger pot in the first place.
One advantage of a bigger pot is having to water less often.
Another advantage is because the bigger pots take up more room, they are further apart, therefore giving the plants more room to spread out sideways.
I suppose it depends on how big you are growing the plant, if growing small plants then having them in big pots would make them too far apart, leaving gaps which, if growing in smaller pots closer together, would be filled.
What do people here think is the best size pot for indoor growing in soil?