O man every one will have a different opinion on this. As of now I am I big fan of Roots organic with steer manure and lime added tell I transplant. I like layered soil so when I transplant I have 2 layers, my base soil I use for veg and my flowering mix in the bottom half of the pot in a #15 nursery pot as of now. My thought is if I have a veg and bloom layer and am only adding water the whole grow there is less shock to the plants as the soil PPM is not swinging so much. Also the large pots have enough soil that I can run a mild amount of additives with out running out of nutrients. I don't have to flush out my pots to flush the veg nutrients out between the veg and bloom faze either. Still working on my top and bottom mix and making changes but this is a simple way of growing and has helped me eliminate making so many mistakes with over feeding or under feeding.