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Pro-Mix Potting Soil

  • Jul 18, 2008
  • #1
  • NoLogo
    New Member

    So as usual I am planning my next grow way in advance lol, anyway I found this Pro-Mix Potting soil at my local hardware store and I remember reading about it in a few forum posts before.

    This is the specific type I bought (not in that size, i got a 28L bag, thinking about going back getting a couple more bags)

    Anyone tried this soil before and had success with it? I’m sure it will be fine, just want to know if anyone has had any crazy good grows with it, or if you have any tips on adding worm castings or not adding things, anything along those lines.

    • Jul 18, 2008
  • #2
  • RooRman
    Well-Known Member

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

    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 Guano: For additional macro/micornutrients.

    • Jul 18, 2008
    • Thread starter
    • #3
    NoLogo
    New Member
    • Jul 24, 2008
  • #4
  • Racefan
    Well-Known Member

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    • Aug 24, 2008
  • #5
  • larryg420
    New Member
    • Sep 1, 2008
  • #6
  • CubsRule420
    New Member
    • Nov 26, 2008
  • #7
  • InSiDeThAvOiD
    New Member
    • Nov 26, 2008
  • #8
  • Aratilis
    New Member

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

    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 Guano: For additional macro/micornutrients.

    Hello everyone! So as usual I am planning my next grow way in advance lol, anyway I found this Pro-Mix Potting soil at my local hardware store and I…

    What is Peat Moss or Promix and should I use it to Grow Cannabis?

    Peat Moss is an inert, biological (once living) substrate that is harvested from wetlands all around the world. Promix is a blended substrate comprised of peat moss, perlite, dolomite lime and a wetting agent. Peat moss blends grow cannabis well and the suggestions below will help you keep the root zone happy and healthy:

    Pros of Peat Moss Blends:

    • It’s a fairly inexpensive substrate that comes ready to use in user friendly compressed bales.
    • Peat Moss can hold a lot of water – up to 25x its weight.

    Cons of Peat Moss Blends:

    • Peat Moss has the potential to accumulate a lot of excess nutrients.
    • Peat Moss is naturally acidic (4.5 pH). Peat Moss blends use dolomite lime to increase the pH of the peat. Over time, the lime will break down, plants will absorb it and the pH of the substrate will drop.
    • Peat Moss is naturally hydrophobic and repels water. Wetting agents are needed to ensure proper and even saturation.

    Tips for Using Peat Moss Blends:

    • Check the label of the peat moss blend you buy and see if it has an included “starter charge”. If it does, the first couple feeds should be only pH’d water.
    • If the pH of the Peat Moss becomes too acidic over time, top dress or re-amend it with dolomite lime or oyster flour.
    • Always monitor the pH and EC of your runoff. If your runoff EC /PPM is too high, help correct it with your next feeding. Use the Perfect Grower runoff chart below to help guide you:

    Peat moss blends grow cannabis well and the suggestions below will help you keep the root zone happy and healthy. Read more!