A really good mix is 1/3 peat moss, 1/3 perlite Try to get both non-miracle grow. then use 1/3 compost. Buy dolomite lime and add it to the mix at a rate of 1 tablespoon per gallon of mix, this will take care of the calcium and magnesium which are the two most common deficiencies. You will have a light, well aerated mix and your plants will thank you! You will need to use nutrients as this mix has very little. don't begin fertilizing until after transplant when you see new growth. What nutes dre you using?