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Worm castings are a brilliant all-natural soil conditioner: not only do they contain macro nutrients, but they are also abundant in micro nutrients, minerals and trace elements (plus worms refine these to their most plant usable form).

In our Wormcasts mix the casts have been enriched with a small amount of peat-free ericaceous compost to reduce the pH, as well as bone meal and wheat bran to naturally increase phosphorous levels.

In addition, the casts in this mix have been slowly air dried to limit the potential for there to be any fungus gnats or other malicious pests present.

Benefits of using this product

This is a general purpose, organic amendment: it can be blended with your substrate when doing your initial mix, or used as a top dressing at the vegetative or flowering stages of your plant’s life.

Nutrient analysis

  • Nitrogen: 1
  • Phosphorous: 2
  • Potassium: 0

    How to use it

    Use it as a top dressing: add it to the top of your growing medium and water in well after application. Also use in your initial mix.

    When growing in coco it is recommended that Wormcasts are added as it increases the humus and calcium levels and reduces the requirement for cal mag additives.

    Many customers also add our Wormcasts along with some Rockdust as this boosts the mineral content of the substrate.


    Soil: Up to 2 tbsp per gallon of substrate as additional nutrients & humus in vegetative or flowering stage. Coco: Double the soil quantity.

    Chemical analysis


    [Please note: unfortunately our 5L bags are the only items in our range that are not compostable: we cannot find a compostable bag that is big enough - as soon as we can, we will use it].

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