m0useanswered grow question 3 years 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!