[RooRman]

You can play with the amounts, which is the nice thing about making your own mix. This should get you started:

1 Bag of Pro-Mix BX Seed and Clone (Peat, perlite and dolomite lime)

10-20% Perlite: for added drainage and soil aeration. Use closer to 20% for flowering mixes.

10-30% Worm Castings: for nitrogen, added micronutrients and aeration.

1-2% Dolomite lime: Pro-Mix BX Seed and Clone has this already added! So I don't add it. Basic Pro-Mix, to my knowledge, does not. Dolomite lime helps stabilize the pH of the soil. Pro-Mix is mainly peat and as the peat breaks down the soil gets more acidic. Dolomite lime is used to combat this natural lowering of the pH.

2-4% Kelp meal and/or Bat guano: For additional macro/micornutrients.