
Premium Insect Nutrition
More Than Just Fertilizer; A Regenerative Soil Amendment
Sonoma Organic Black Soldier Fly Larvae Frass is an exceptional plant fertilizer and soil amendment. It provides a balanced, slow-release nutrient profile, high levels of chitin for disease resistance, pest repellent and beneficial microbial activity. Our BSFL Frass organic fertilizer has an NPK of 4-3-4.
Why choose Sonoma Organic BSFL Frass?
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Immune System Booster (Chitin): Frass contains high amounts of chitin from molted larva skins. When chitin breaks down in the soil, it triggers a plant’s defense mechanisms, acting like a "natural vaccine" that improves resistance against pests, diseases, and fungal pathogens.
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Fights Molds and Mildew: The frass contains beneficial microbes (such as Bacillus) that can outcompete and suppress harmful soil-borne fungi, reducing root diseases. Studies have shown that BSFL frass extracts can inhibit the growth of common plant pathogens, including Fusarium (wilt), Alternaria (blight), and Botrytis (gray mold).It supports healthy plant growth while strengthening the plant's ability to resist disease in moist environments.
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Rich Nutrient Profile: It provides a balanced supply of nitrogen (N), phosphorus (P), and potassium (K) that is readily available to plants, along with micronutrients that promote growth without the risk of nutrient burn.
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Restores Soil Biology: BSFL frass increases soil organic matter, improves soil structure, and enhances water-retention capacity. It feeds beneficial soil microbes, which aids in nutrient cycling and improves long-term soil fertility.
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Safe and Clean: BSFL are highly efficient at digesting food waste, eliminating pathogens like E. coli in the process, making the resulting frass safe for use in gardens.
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Sustainable & Organic: As a byproduct of insect farming, it is a regenerative, closed-loop, sustainable, organic alternative to synthetic fertilizers.
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Sarah Jenkins
Poultry Farm Owner
Trusted by Gardeners, Viticulturists, Cannabis Growers and Soil Companies
Sonoma Organic BSFL Frass has been used in a variety of applications across the globe. From backyard gardeners to industrial farmers we have the nutrient solution to fit your needs.
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David Chen
Aquaculture Manager
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Marcus Thorne
Reptile Specialty Breeder