My plants are curently in 1/3 earth worm casts and 2/3 blackgold soil in 1 gal buckets. When I flower them they will be transplanted into 3 gal pots. When I transplant them could I put them into a high potasium organic nute mixed with the blackgold again? Or is more perlite and over things needed too?
more potasium during flowering is better, however many growers simply raise the pH slightly, as this allows the plant to intake more potasium.... its not good if the plants can't get the benefits due to pH. I don't think you need to add anything else if your plants were vegging healthy in the soil before.