First what kind of soil do you use, personally I use roots organic with a few additives and that soil is good for at least a month and needs no extra nutes. Next MG not really ideal to be using, I recommend going with another brand something like fox farms your local grow shop will have a good selection and the person there can help you out on that one. If your really going to use the MG do it at a low strength (1/6 just because all I've seen MG do is burn everything.)first and you can adjust from there depending on what you think it needs.