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Uncle Myc's Manure Blend 2lb bag with cartoon mushroom man logo.
Uncle Myc's Manure Blend 4lb bag with a mushroom character logo.
Uncle Myc's 8lb Manure Blend mushroom growing substrate bag with animated mushroom logo.
Uncle Myc's Manure Blend 2lb bag with cartoon mushroom man logo.
Uncle Myc's Manure Blend 4lb bag with a mushroom character logo.
Uncle Myc's 8lb Manure Blend mushroom growing substrate bag with animated mushroom logo.
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Uncle Myc's Manure Blend Mushroom Substrate

Official Uncle Myc's Dealer Model: UN-DNG2
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  • Available in 2lb, 4lb, and 8lb bag sizes to match your specific batch volume.
  • Sterilized at 15 PSI for 8 hours to ensure a clean growing medium.
  • Contains 25 percent locally sourced rabbit manure for high nitrogen availability.
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VOLUME PRICING

Commercial & Bulk Purchasing

We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.

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Contact Information
THROUGH THE Cultivator's LENS Hands-On Evaluation

  • You are scaling up your mycelium production because you are tired of inconsistent results from generic off-the-shelf bulk mediums.
  • You are switching to a specialized manure blend because your current substrate lacks the nitrogen density to push your harvest to its full weight potential.

  • The 25 percent rabbit manure ratio is the real deal, and it creates a density that simple coco-based mixes just cannot touch.
  • Sterilizing at 15 PSI for 8 hours is the industry gold standard, and we see far fewer contamination issues with these bags.

  • Users report that moving to this specific blend allowed them to see denser, more uniform flushes across their entire rack system.
  • Growers who transitioned from DIY mixing say they saved enough time on prep to focus on their climate control settings instead.

Uncle Myc's Manure Blend Mushroom Substrate

Manure-loving mushroom species need a genuinely nutrient-dense substrate to reach their full yield potential, and most bagged mixes fall short on that front. Uncle Myc's Manure Blend Mushroom Substrate solves this with 25% locally sourced rabbit manure, naturally rich in nitrogen and essential minerals, delivering the balanced, slow-release nutrient profile that drives vigorous mycelium growth. To achieve the best results, we recommend inoculating your genetics into an Uncle Myc's Rye Berry Grain Sterilized Mushroom Spawn Bag before transferring to this blend.

Every batch starts with fresh, chemical-free manure sourced directly from small, local farms — never commercial feedlot waste. From there, the substrate is hydrated to field capacity and fully sterilized at 15 PSI for 8 hours, eliminating contaminants and producing a clean, reliable growing medium built specifically for manure-loving species.

Whether you're a home hobbyist running a single tub or a dedicated cultivator scaling up production, this substrate is available in multiple sizes to match your operation. For growers seeking a simplified process, the Uncle Myc's All-In-One Mushroom Spawn Bag offers a convenient alternative by combining growth stages in one bag.

Features

🐇
25% Rabbit Manure

Superior nutrient density from naturally nitrogen-rich rabbit manure for vigorous growth.

🔬
Fully Sterilized

Sterilized at 15 PSI for 8 hours for a clean, contaminant-free growing medium.

🌾
Sourced From Trusted Farms

Fresh, chemical-free manure from small local farms — never commercial feedlot waste.

⚡
Fast Colonization

Supports rapid colonization and healthy, abundant yields batch after batch.

🍄
Built for Manure-Loving Species

Specially formulated to suit mushroom species that thrive on manure-based substrates.

⚖️
Three Sizes Available

Choose 2lb for small batches, 4lb for standard grows, or 8lb for larger-scale operations.

Perfect for Growing

  • Button Mushrooms (Agaricus bisporus)
  • Portobello Mushrooms (Agaricus bisporus mature form)
  • Crimini Mushrooms (Agaricus bisporus brown variety)
  • Almond Mushrooms (Agaricus subrufescens)
  • Shaggy Mane (Coprinus comatus)

Frequently Asked Questions

What makes this substrate different from standard mushroom substrates? +

It's blended with 25% locally sourced rabbit manure, which is naturally rich in nitrogen and minerals. If your species requires a different nutrient profile, we also carry Uncle Myc's CVG Supplemented Bulk Substrate for more general-purpose applications.

Which mushroom species is this substrate best for? +

It's formulated specifically for manure-loving species like button, portobello, crimini, and almond mushrooms, as well as Shaggy Mane. These species thrive on the nutrient profile that manure-based substrates provide.

Is the manure safe and chemical-free? +

Yes. The manure is sourced directly from small, local farms rather than commercial feedlots, and every batch is hydrated to field capacity and sterilized at 15 PSI for 8 hours before packaging.

Do I need to sterilize or prepare this substrate myself? +

No. The substrate arrives fully sterilized and hydrated to field capacity, so it's ready to use straight out of the bag once mixed with your spawn. If you are cultivating wood-loving culinary mushrooms like Lions Mane or Oysters, you should use our Uncle Myc's Master's Mix Bulk Substrate instead.

Which size should I choose — 2lb, 4lb, or 8lb? +

The 2lb bag suits small test batches, the 4lb size fits most home setups, and the 8lb bag is built for larger or multi-container grow operations.

Can beginners use this substrate? +

Yes. Since it arrives pre-hydrated and sterilized, hobbyist growers can go straight from spawning to colonization without needing specialized equipment or prep experience.

Happy To Help

Questions About This Product?

Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)

Call (360) 800-5535

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