Wiggle Worm Worm Castings Organic Fertilizer 15lb
by Unco Industries
Unco Industries has been producing Wiggle Worm worm castings in Union Grove, Wisconsin for over 45 years, and their 15-pound bags represent one of the most trusted sources of pure vermicompost available. The multi-screening process removes worm eggs, sticks, and undigested bedding without heat treatment, preserving the full beneficial microbial ecosystem that gives worm castings their soil-building power. These 100% pure castings won't burn plants at any application rate and improve soil structure, moisture retention, and microbial diversity.
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What We Love
- 100% pure castings — no fillers, wood chips, or undigested material
- Impossible to burn plants — safe at any application rate
- Improves soil microbial diversity, not just nutrient levels
- 45+ year track record from a dedicated vermicompost facility
Worth Knowing
- Relatively low NPK numbers (1-0-0) — more soil amendment than active fertilizer
- Heavier and bulkier than concentrated fertilizers
"Worm castings are genuinely different from fertilizers — they don't just add nutrients, they add life to the soil. The microbial diversity in quality castings like Wiggle Worm actively suppresses soil pathogens, improves water retention, and makes existing nutrients more bioavailable. Mix 10–20% into any potting medium or top-dress established containers. At 4.8 stars with over 5,000 reviews, this is one of the most trusted soil products on Amazon."
