the MG was a good call, you wont have to put nutrients in the soil for a month or two what i would do if i were you, is get a bag of sphagnum peat moss, and make about an inch deep layer of it across your plot, taking care not to push or tamp it down too much.. this will hold alot more water.. when the time comes to fertilize, use something high in phosphate.. which is the second number in the NPK.. when you pick up fertilizer and read it, itll have three numbers on it, lets say 3-4-5 for the hell of it.. this stage you want something high in the second number.. theres no real way to tell you exactly what number to get, but if the second number is higher than the other two then youre good to go.. when you start getting buds, switch to something high in nitrogen, nitrogen is the first number.. but with the MG soil you wont have to worry about that for prolly a month.. just be careful, and follow the directions on the fertilizer cuz its easy to burn a weed plant with nutes.. have a happy grow watergirl