m0useanswered grow question 3y ago MG as in miracle grow?
Its not bad for seed starting but it won't get you far past that.
Its mainly peat with some slow release nutrients and a sprinkle of perlite.
If you do decide to switch to Fox Farms there soils are said to be good but can be a bit hot for autoflowers.
You could mix it 50/50 or 25/75 with the remaining MG you have to help use it up.
Your PH will change when watering as well.
FF is a soil base and likes it between 6.5-6.8
MG is peat based and likes it between 5.8-6.2
Best Of Luck and Happy Growing!