I doubt you could find the best kind of ferts and nutes needed to grow cannabis at your local nursery or walmart. I have several nurseries here and none of them had the kind of nutes that are suitable for growing cannabis. The hydro stores have the best and I don't see how it would raise any red flags if you ordered online (just don't order bulk). My husband won't let me buy ANYTHING online - except seeds (he's paranoid too). Luckily I have several hydro stores here. The guy at my hydro store recomended Pure Blend Pro Grow made by Botanicare for vegetative growth. It can be used in hydro as well as soil. He said it was great to use if you're growing in soil because unlike other ferts, it has the right amount of N-P-K + micronutrients that others don't. I wish I would have known about this in the beginning because I had used regular ole Miracle grow I bought at walmart and it was lacking the micro nutes. I realy messed up my plants. I am sure you could still use nutes that you can buy at your local walmart but then you would have to ajust how much you give them (can't go buy the bottle). Then you would have to buy other stuff (the micronutrients) if it's not included in the fertilizer your using. Its a pain in the ass. It might not be for the pro growers here, but I'm a new grower and I got too much money invested to F it up.