Soil Amendment Products
Build better soil with mycelium-powered amendments.
Stems ’n Caps soil amendments are made from spent mushroom substrate (SMS) generated during our gourmet mushroom production. Instead of treating it as waste, we transform it into a biologically active soil-building material that improves structure, nutrient cycling, and microbial life.
Our products are designed for growers, gardeners, landscapers, and regenerative agriculture applications seeking sustainable, functional soil inputs.
Soil Amendments
Check out each of our unique soil amendment products below.
Whether you're farming large acres or small pots, we've got you covered.
Our soil amendments are all natural and designed to help build healthy and clean soil.
Aged Soil Conditioner
Aged Spent Mushroom Substrate
A stabilized, composted soil conditioner suitable for general soil improvement and blending.
Best for
- Garden beds and raised beds
- Landscaping and turf improvement
- Mixing into native or depleted soils
Key benefits
- Improves soil structure and moisture retention
- Adds stabilized organic matter
- Mature and stable for direct soil application
Use
- Top dressing or soil incorporation
- Blended into compost or soil mixes
Premium Soil Conditioner
Probiotic for your soil, Re-Myceliated Soil Builder
A biologically active soil amendment made from spent mushroom substrate that has been re-inoculated and re-colonized with beneficial mycelium.
Best for
- Regenerative and fungal-forward growing systems
- Soil restoration and depleted soils
- Garden beds and perennial plantings
Key benefits
- Introduces active fungal biomass
- Supports soil biological activity
- Improves soil aggregation and long-term resilience
Use
- Soil incorporation for long-term conditioning
- Blended with compost or native soil
- Applied during bed preparation or regeneration projects
Vermicompost
Soil Conditioner
Vermicomposted Spent Mushroom Substrate
A biologically processed soil amendment produced by vermicomposting spent mushroom substrate, resulting in a fine-textured, stable material.
Best for
- Garden beds and raised beds
- Container gardening and transplants
- Blending into existing soils or compost
Key benefits
- Adds stabilized organic matter
- Supports soil microbial activity
- Improves soil structure and moisture-holding capacity
Use
- Top dressing or soil incorporation
- Blended into potting mixes or compost
- Applied during planting or general soil preparation
