Quote Originally Posted by Buffalo Soldier
you guys think i should cover the top of the soil with cardboard, to get more out of the pot? I don't want to run into problems when i'm at the end of flowering in the 3 gal pots.
Not sure what you mean about putting cardboard on top of the soil? Are you talking about extending the pots with cardboard wrapped around them?

You could try cake stacking, i.e. a few weeks into flower you use the same pot and fill about 1/3 with soil and place the rootball on top of that, then filling in the sides. IMO, you will run into trouble with just those 3 gals for the entire grow