KIS Organics

Mealworm Insect Fertilizer (Frass)

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  • Regular price $ 25.00
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Insect frass is a natural fertilizer and has the following benefits for plants and crops:

  • Supports plant growth under stress
  • Beneficial microbes for plant growth and production
  • No nitrates, heavy metals, methane, or nitrous-oxide emissions
  • Neutral pH
  • Dry powder is easy to apply
  • Water-soluble for use in hydroponics and fertigation
  • Contains chitin
  • No odor
  • No burn
  • Not a pesticide or fungicide, will not bring new insects into your garden.

This insect frass is 100% from mealworms!  Dry and ready to use, minimal odor and can be applied via a spreader for larger areas.  Mix with water for indoor and outdoor use.


Please note: these are recommendations, your requirements may be different depending on your specific use and environment factors.

For best results, pre-mix into a growing media or soil when planting. If plants or already started, mix frass with water and apply as a root drench. Frass can also be applied as a top dressing, in hydroponic systems, as a foliar spray, and into transplanting holes.

Application Rates (only suggestions, modify for your specific use case)


Add a pinch of Frass under the roots.


Add 1 cup of Frass per cubic foot (or 7 gallons) of planting media prior to planting. It should be less than 1% by volume. Beginning in week 2, Top Dress or Compost Tea every 2 weeks.


Add 2 cups of Frass per 30 gallons of water (strain for drip systems). Top dress any grow media (Coco, Clay Pellets, etc.) Add directly to reservoir for ebb and flow or flood to drain systems.

Top Dress

Sprinkle over root zone and water in immediately. 1 pound per 20 sq ft, 1 tablespoon per plant, every 2 weeks.

Foliar Feed

Add 4 teaspoons of Frass for each gallon of water (1 teaspoon per quart). Shake and let sit for 30 minutes. Strain and apply.

Compost Tea

Add 2 cups per 15 gallons of tea (2 tablespoons per gallon) to achieve a fungal dominant tea. Apply as a root drench.


Customer Reviews

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Customer Reviews
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Filter Reviews:
Christopher C.
United States United States

Great service!

Great service, fast delivery. Quality product. Will use again

josiah b.
United States United States


Quality product. Always a smooth experience ordering amendments from KIS

KIS Organics Mealworm Insect Fertilizer (Frass) 2-3-2 Review
Ron G.
United States United States

Always a staple in the garden

I use this In my garden with great results

KIS Organics Mealworm Insect Fertilizer (Frass) 2-3-2 Review
United States United States

Best Frass

I’ve had Frass from other insects but the quality on this product is ‘top notch’.