All the bagged stuff my old housemate brought home was full of bugs that infested my houseplants. I am still battling fungus gnats in the house. There are horrific accounts of Miracle-Gro disasters online, from pests to mold to weird shredded plastic to petrochemicals in product sourced from China. I got some Miracle-Gro AV and succulent mixes from Lowe's. I can get away with them if I freeze to kill active bugs and then bake to kill eggs and then mix a teaspoon or two of Actinovate to keep away mold.
I think peat moss mixed with garden soil and some pelletized flowering plant food would be better than chancing the above.
