im using miracle-grow all purpose plant food its 24-8-16...i dont use it too often but i can say this i supplied the seeds to my friend for a kick back of a couple plants and he wasnt using it and his grow to about foot and a half and mines pushing 3 foot...how i use it dont hold me to this but i mostly use it in a spray bottle and spray the plants from the bottom of the stem to the top bud(i do this most often) i also sometimes mix a gallon of it with water and feed the roots...if you use this feed you wont have to worry about bugs getting into your soil and messing with the roots because it has boric acid in it..but you got to to remember that you need to stop about a week or two before its ready to be picked so you wont be smoking the feed