Organic Super Soil Recipe for Indoors

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*BASE POTTING MIX*

30% Sphagnum Peat Moss
10% Redwood Bark
10% Coco coir
20% Perlite
5% Lava Rock
15% Compost
5% Worm Castings
5% Alaskan Humus

Nutrients should be added relative to the amount of base potting mix you have.

*BAT GUANO* (e.g. VermiBat by Vermicrop Organics)

4 lb / cubic yard of base potting mix
67 g / cubic foot
2.37 g / liter

*SEABIRD GUANO*

4 lbs / cubic yard of base potting mix
67 g / cubic foot
2.37 g / liter

*BONE MEAL*

4 lbs / cubic yard of base potting mix
67 g / cubic foot
2.37 g / liter

*POTASSIUM SULFATE*

2 lbs / cubic yard of base potting mix
33.5g / cubic foot
1.185g / liter

*FINE DOLOMITE LIME*

2 lbs / cubic yard of base potting mix
33.5g / cubic foot
1.185g / liter

*FEATHER MEAL*

1 lbs / cubic yard of base potting mix
16.25g / cubic foot
0.59 g / liter

*AZOMITE®*

1 lbs / cubic yard of base potting mix
16.25g / cubic foot
0.59 g / liter

*DRY POWDERED SEA KELP* (e.g. VermiKelp by Vermicrop Organics)

1 lbs / cubic yard of base potting mix
16.25g / cubic foot
0.59 g / liter

*ALFALFA MEAL*

1 lbs / cubic yard of base mix
16.25g / cubic foot
0.59 g / liter

*OTHER OPTIONS FOR ADDING ORGANIC NUTRITION*

*Blood meal* (e.g. VermiBlood by Vermicrop Organics) — dried blood, not for the squeamish. Same NPK as feather 12-0-0. Very expensive. Contains iron. Very high protein content. Fine, water soluble. 

*Calcium Phosphate* — not my favorite. Cheap – gives you phosphorus and calcium. Popular with organic growers. Issues with contaminants. (Uranium, Plutonium, cadmium, arsenic) Not recommended for growing medicinal plants.

*Crustacean Meal* – combination bi-product – ground up lobster, crab, shrimp shells. High N content along with potassium and calcium. Chitin in the crustacean meal provides a defensive response in plants against insect predation, so it can act as a beneficial pest preventative.

*Fishbone Meal*— store in dry conditions. Mold susceptible. High N. Very high phosphorus.
 
*Glacial Rock Dust* — trace elements—soft rock phosphate. High Phosphorus mined rock. 0-3-0 ultra slow release. Not recommended for short cycle plants.

*Green Sand* — Sand or sandstone with a green color. High silica levels. Another mined product. Similar to glacial rock dust.

*Insect Frass* (e.g. Charge by Ecothrive in Europe or “Insect Frass” in North America) broad spectrum fertility and a hit of beneficials. Also contains chitin.
 
*Mycorrhizae* (e.g. Subculture M by General Hydroponics) – More economical to use in transplant (direct contact with roots) rather than blending with potting mix. Relationships tend to be long term so there’s an argument that this is better suited for cultivating larger, older plants.

Don’t forget—if you follow this recipe make sure you wet your mix with some water and give it some time to compost and pH stabilize over a month or so.

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16 thoughts on “Organic Super Soil Recipe for Indoors

  1. I wish somebody would do a UK super soil version. We can’t get all the
    products you guys get and unable to complete the steps.

    1. +Daniel Bird This recipe is based on ClackamasCoots recipe, “no till” style
      and all the ingredients are easy to obtain in the United Kingdom at a good
      grow shop:
      70L Irish peat (clover brand is very good) Or 50:50 peat/coco.
      70L Potting bark (and or Perlite or pumice) with 10-20L bio char
      35L Worm castings35L green compost
      (Total = 210L)

      To each 210L batch of this mix add the following:
      740ml cup organic Neem meal
      740ml organic Kelp meal
      493ml blood fish bone
      1L Ecothrive Charge (Insect Frass)

      Minerals

      2964ml Volcanic Rock Dust
      1482ml Gypsum (Calcium and Sulfur)
      1482ml calcium carbonate Once mixed and allowed to cook for a few weeks add
      to fabric pots and add around 500g of worms per 50-70L. Mulch with straw
      and/or sow some clover as a cover crop.
      This shouldn’t need much extra liquid ferts or top dresses for a few months.

    2. Thank you so much. Can’t wait to see what you can come up with and
      guarantee that you will help a lot of us UK guys who love to grow. Thx so
      much again can’t wait 🙏🏻🇺🇸🇬🇧

    3. Thank you so much. Can’t wait to see what you can come up with and
      guarantee that you will help a lot of us UK guys who love to grow. Thx so
      much again can’t wait 🙏🏻🇺🇸🇬🇧

  2. Thanks for another great video. Im afraid you just lost two subscribers
    however: Uncle Ben and homebrewer :/ Oh well, they obviously dont need any
    new tips

  3. I mean, can you add supplemental liquid nutrients to a mix like this? is it
    safe to? how about foliar feeding? im pretty new to gardening and your
    channel has a lot of info btw. thx for the effort!

    1. You certainly could add liquid nutes to this mix but I’d suggest waiting
      until the plants had been growing for four weeks or more. Thanks for your
      kind words about my channel. Good luck and happy growing. You know where I
      am!

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