Please don't use Miracle Grow soil Rasta... it would break my heart
The main problem with MG soil is the shitty nutrients they conveniently pack into all their products. They are 100% chemical-based and end up burning most of the plants subjected to it. The NPK ratio of MG is not quite right for growing
marijuana, and it lacks a lot of the secondary nutes your plants need to live a healthy, productive life. And if you try to correct a deficiency by increasing the strength of your concentration, you'll end up giving it too much of another nutrient that it is not deficient in and burn your plants. Go get yourself some FoxFarm Ocean Forest. It is perfect right out of the bag and won't need any supplementation for the first 3 weeks of use. Some people like adding a 20% cut of perlite to improve drainage, but I haven't found that to be necessary and use it straight out of the bag.