Fortunately for you I work at Lowe's and know pretty much everything there. Use the Alaska fish fertilizer bloom booster sold there, it's an organic water soluble fertilizer. I wouldn't reccomend the MG booster, it's gonna accumulate salts in your soil after a while. There's a MG organic blood meal supplement you could use for flowering as well. Water soluble fertilzers are probably a better idea, easier to control the ammount of nutrients your plant is receiving, and eaier to flush, versus using slow dissolving granules.