Mealworm Frass as Fertilizer – Reader Question

Mealworm frass is a great fertilizer!

Mealworm frass is a great fertilizer!

This weeks reader question is can mealworm frass be used as fertilizer?

The short answer is mealworm frass fertilizer is great for your garden.

Mealworm Frass Fertilizer Explanation

Mealworm frass is the leftover material after you clean your setup. It is mostly mealworm poop, although it might also have some bedding, food, and eggs included (and that is okay for your garden as well).

  • Mealworm frass has a high nutrient level
  • Mealworm frass is also a great soil inoculate (it introduces beneficial bacteria and microbes into the soil).

The biggest downside to using mealworm frass fertilizer is when you get it wet it can have a smell (similar to your mealworm setup so it may not bother you). Personally I am not fond of the smell of mealworms. For this reason, I generally throw the mealworm frass into the compost bin instead of directly on the plants. The good nutrients will be introduced to the compost that way and it works as a great compost inoculate.

It's yet another way to recycle resources on your homestead! Raise mealworms for your chickens and use both the mealworm frass and the chicken poop in your compost pile to be added to your garden.

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  • Reply Robert January 28, 2015, 8:43 pm

    I read your comment about mealworm frass as fertilizer. I am considering raising both black soldier flies and meal worms. I’m trying to find out if anyone has used this frass as food for black soldier fly larvae? My concern would be the high ammonia content in the frass. Any thoughts would be appreciated.

    Thank you,

    Robert Truman

    • Reply Heidi January 29, 2015, 5:11 pm

      I have not raised black soldier flies yet (although I have looked into it) so I am not 100%. But, I would guess that the frass would not work as food. BSF generally eat composting materials – leftover fruits, vegetables, etc. Frass is nothing like that. It also wouldn’t have much nutritional value and BSF create a frass of their own. I don’t know for sure though.
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