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Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems
Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems

Spent Mushroom Substrate (SMS) Additive - Boost Your Worm Castings and Composting Systems

$24.99 $35.00

Take your composting and mushroom cultivation to the next level with our Mushroom Substrate Additive — a powerful supplement designed to work alongside your existing worm castings, vermicompost bins, or traditional compost setups.

This high-performance additive enhances microbial activity, improves substrate structure, and accelerates organic breakdown. It’s the perfect companion for red wigglers, European nightcrawlers, or hot compost piles, creating an environment that supports thriving mushroom mycelium and nutrient-dense compost.

Just sprinkle it into your worm bins, compost piles, or mushroom substrates to promote faster decomposition, better aeration, and optimal moisture balance.

Why Add It?

  • 🔁 Enhances the efficiency of worm bins and compost piles

  • 🍄 Creates a mycelium-friendly environment for mushroom growers

  • 🌱 Stimulates beneficial microbes and soil life

  • 💧 Helps regulate moisture and prevent anaerobic conditions

  • ♻️ Perfect for backyard composters, worm farmers, and mushroom enthusiasts

Best Used With:
Worm castings | Vermicompost systems | DIY compost piles | Mushroom grow kits

Application Tip:
Use as a top-dressing in worm bins or mix into your mushroom grow medium to kickstart biological activity without disturbing your worms or compost balance.

Take your composting and mushroom cultivation to the next level with our Mushroom Substrate Additive — a powerful supplement designed to work alongside your existing worm castings, vermicompost bins, or traditional compost setups.

This high-performance additive enhances microbial activity, improves substrate structure, and accelerates organic breakdown. It’s the perfect companion for red wigglers, European nightcrawlers, or hot compost piles, creating an environment that supports thriving mushroom mycelium and nutrient-dense compost.

Just sprinkle it into your worm bins, compost piles, or mushroom substrates to promote faster decomposition, better aeration, and optimal moisture balance.

Why Add It?

  • 🔁 Enhances the efficiency of worm bins and compost piles

  • 🍄 Creates a mycelium-friendly environment for mushroom growers

  • 🌱 Stimulates beneficial microbes and soil life

  • 💧 Helps regulate moisture and prevent anaerobic conditions

  • ♻️ Perfect for backyard composters, worm farmers, and mushroom enthusiasts

Best Used With:
Worm castings | Vermicompost systems | DIY compost piles | Mushroom grow kits

Application Tip:
Use as a top-dressing in worm bins or mix into your mushroom grow medium to kickstart biological activity without disturbing your worms or compost balance.

A $5.99 handling and packaging charge will be accessed on all orders under $40.00. Shipping is free with an order of $40.00 or more.  Alaska Shipping Charges are $5.99 Flat Rate.

If you are not fully satisfied with your purchase, we will either replace or refund your purchase within 30 days of delivery.

All orders verified by USPS as delivered are assumed to be so.  Contact your postal carrier if your order shows delivered but you do not find it. 

Orders verified as lost by USPS will be refunded or replaced if notified within 30 days of shipment.