Frass – Living Soils


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Insect frass is an organic fertiliser. Unlike bat guano or wormcasts, frass comes entirely from herbivore insects (in this case the mealworm or Tenebrio Molitor); this means you are essentially feeding back digested plants to your plants making it a perfect, well-rounded form of plant food packed with microbial life plus chitin!

Unlike other 'certified' frass (where the insects are farmed for the reptile and pet industry), you won’t find any residues of pupating inhibitors and/ or growth hormones in ours. If you look closely, you can see that our frass sometimes contains small exoskeletons from the mealworm. This is as organic as it can get!

The importance of Chitin

Chitin is a naturally occurring molecule that is found in the shells of crustaceans like lobsters and crabs, as well as the exoskeletons of insects, in this case the mealworm.

Benefits of using this product

Because insect frass is made entirely from digested plants, it’s full of the nutrients plants require to grow robustly. Plus, millions of beneficial microbes from the guts of insects. 

Chitin triggers the immune system of your plants causing them to rev up and defend itself against predators like root-feeding nematodes and disease pathogens in the soil.

Nutrient analysis

  • Total Nitrogen (N)  .....2%
  • Phosphorous (P) ........3%
  • Potassium (K) .............2%

How to use it

Use it alongside our other products for the vegetative stage such as Grow or Grow AUTO.

It is a top dressing: add it to the top of your growing medium and water in well after application.

Suggested dosage

Soil: Up to 1 tbsp per gallon of substrate every 2 weeks through the vegetative stage. Coco: Double the soil quantity.

We don't advise adding frass for automatic varieties with a short vegetative stage or during flowering as we feel it may impact the plant's flowering potential.

[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].