Trader Horn would have nutrients that Wal-Mart wouldnt?...ill check that Franks place tomorrow but on a different note, i want a good yield but i dont want my pants to be as big as my last grow, but i do want a fair amt to harvest. Whats good length, last time i flowered around foot and 3/4s, my first successful grow i didnt realize that the plants double in size. I thinking wait til they r about a foot tall and then flower....This way my 2 gallon containers will work out from the system i heard of a gallon for every foot....