I use what is called Humbolts Super Soil, with great results. Per 200 gal smart pot - 4 bales sunshine mix, 4 cuft chicken poop, 80lbs worm castings, 3cuft perlite, 27lbs steamed bone meal, 10lbs kelp, 10lbs oyster shell, 10lbs dolomite lime, and 10lbs gypsum. If anyone is wanting to try this...