I am using a 30 gal smarty...20 gal bags....and 5 gal pots....I dug them all into the earth, the 30 and 20's only dug them about 4-6 inches and amended soil beneath them, the 5 gals I drilled about twenty half inch holes in the bottom of those and dug them in 2x4 foot holes(wider than deep) This is my first grow outdoor(all indoor) and IM shooting for 1 pound a plants, strains our blue dream, purple cindy, and cherry pie......I did all different to see what turns out best. Any bets on what will be the biggest yielder.....5?20? or 30?