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Mealworm Frass - World's best organic fertilizer

Updated: Nov 26, 2025

Insect farming is expected to grow in the next few years, and this will also lead to generating high quantities of frass. Mealworm frass is what's left over after the worms eat wheat bran. This 'poop' is a dry, sand-like substance that makes a great, cheap fertilizer! Frass contains all the natural elements to make your soil rich and productive without any chemical ingredients.


Mealworm Frass
Mealworm Frass

Meeting an ever-increasing food demand while reducing agriculture’s negative environmental impact is one of the greatest challenges of the twenty-first century. We need to search for other protein sources in order to reduce the exploitation of agricultural land for increased food demand. Rearing insects for mass consumption is increasingly sparking interest due to their high nutritional value and, most importantly, their resource efficiency when converting organic matter, especially waste, into protein. This is also producing the insect and mealworm waste, which is called frass and which is found to be highly nutritious for soil.


Frass deposition to soil has a great impact on soil fertility due to its high nutrient

and labile C content. Chemical characterization of frass reveals that it has concentrations

of N, K, and P as high as those found in farmyard manure and, especially, poultry manure, which confirms its high fertilizer potential. By contrast to conventional mineral fertilizer, frass also contains small concentrations of micronutrients (i.e., Cu and Zn), which may be further beneficial for crops.

Mealworm Frass
Mealworm Frass

Frass has a layered structure and uniform distribution of nutrients (P, K, and Ca) within the frass organic matter, suggesting the absence of isolated mineral phases that might potentially drive nutrient release by frass. Thus, the release of nutrients by frass after its incorporation into soil should be homogenous and possibly more extended than fertilizers in which nutrients are unevenly distributed. Also, frass rapidly decomposes in soil in an early decomposition process, which provides rapid mineralization of the soil, which is highly beneficial for crops. Most importantly, the presence of frass may increase microbial metabolic activity and diversity, suggesting better soil functioning, especially when frass is combined with mineral fertilizers.


Therefore, mealworm frass is 100% natural, organic fertilizer, which is highly effective and cheaper in price as well and could be the best fertilizer for the soil in the world.

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