Miracle Grow is harsh chemical's. Plus it has no magnesium.
Even worse is earth juice, which is uncomposted sewage.
Plus--greenfire, the makers of earth juice, had 2 growshops in central/N. Calif. and turned their customers into the cops.
Amended potting soil (soil with natural components like earthworm castings and seaweed) are good but need add'l nutrients during flowering.
Potting soil with chem. fertilizers already added aren't recommended, because plants have different nutrient needs at different stages of growth.