Not to sound mean but miracle grow is for your grandmothers climbing ivy plants peters is about as crappy as i would go on fertilizer because cheap fetilizer has an abundance of salts in them which quickly toxify soil and the common solution seems to be leach with clean water but doing so rinses the nitrogen from your medium which will cause the ph to spike making nutrients unavailable and the whole time you feel you have fixed the problem it is sort of a cost/results balance--how much would it cost you to purchase the desired results and then decide if cheaper is better there are good fertilizers by american agritech or gh hydroponics and for leaching there is a product called clearex which removes salts by bonding with them and leaving valuable nutrients available to the plant also higher end fertilizers are made from better source materials so the salts are minimal and easier to manage as with anything you reach a point of diminishing returns if you try to get more bang for your fertilizer buck the numbers on fertilizer packaging represent available parts per million of each component and every nutrient (there are 14) has an optimal level more-toxicity,less not enough for rapid healthy growth. peters at least has trace elements last i checked miracle grow needed to be supplemented with miracle grow plant first aid which still doesn't supply all the necessary trace minerals not to mention auxins and other hormones and growth regulators