just go in and say I would like a npk ratio plant food 20-20-20 or just go to the plant food and look they have different NPK ratios for each brand just ask where is the plant food. NPK ratios should be near the top right part of one side of the box or bottle. usually where the description of ingrediants. remember not a strong as the box says 1/4 strength for a couple of weeks after u start feedin.