i dont tend to use ferts actually i just use a real good organic medium however when i do fertilize my plants i use a varity of organic ferts ie fish emulsions,terra cylce worm tea,country select multi bloom organic liquid fertilizer,neptunes seaweed,stress-x which is a Ascophyluum nodosom extract big word i know it its some type of seaweed but i find that is great also any of those would work i would evan combine em