my grow is nothing but promix and espoma, you don't need all the expensive stuff. Invest in good soil, not to say you cant yield good results with cheap soil but should add extra perlite. My first grow was all MG soil and nutes in 2 gal pots until August, never seen a plant so rootbound. Upped them to fives and they exploded with growth, got 4-8 oz a piece. That being said, they were also started from seed outside end of May, and basically had to grow back from nothing mid July when deer, or something else tore them to pieces