You could get a thousand responses to this question and every one of them will probably have differing views. IMO cannabis is a very versatile and adaptive plant. I personally don't believe that there is one kind of fertilizer or NPK ratio that will work the best. Try something from your local grow shop that you can afford and appeals to you. Best of luck and welcome to RIU.what is the best nutrient ratio of N-P-K to use for 3 week old lowryder 2's, they started flowering about 3 or 4 days ago??