If your useing miricle grow I would be very careful of useing anything else. M G has a lot of nutrients that are not for MJ plants. If anything I would use shult's catus nutes. till the next grow. Then mix your soil with no nutes and then you can use some of what you got. OR go hydro and use all of them at one time or another. Miricle grow is about the worst soil for MJ plants sorry. IT will work, I tried it my first time to, Then went hydro.