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| Species | Dung-loving mushrooms |
| Moisture content | Hydrated to field capacity |
| Bag weight | 5 lbs |
The next generation of home mushroom cultivation is here.
HB4 (Home Blend v4) is a premium, ready-to-use substrate developed by Mountain Made Mushrooms in collaboration with North Spore. Representing the fourth evolution of their acclaimed Home Blend, HB4 was fine-tuned through rigorous side-by-side comparison grows to deliver maximum yields, cleaner results, and multi-flush performance for advanced home cultivators.
This high-performance formula features a 50/50 mix of worm castings and coco coir, enhanced with a custom nutrient pack formulated specifically for the legal cultivation of dung-loving mushroom species. It’s the same substrate that fueled the award-winning strain crowned at the Denver Psychedelic Cup 2024 — a true benchmark for consistency and potency.
Clean, nutrient-rich, and eco-conscious, HB4 offers a manure-free alternative to traditional dung-based substrates without compromising results.
Key Features & Benefits
- Precision-Tuned Formula: Fourth-generation substrate refined through multiple controlled grow trials.
- Optimized Nutrition: Nutrient profile designed to enhance growth, fruiting, and vitality.
- Manure-Free Alternative: Worm casting–based mix reduces contamination risk vs. traditional manure substrates.
- Proven Performance: The choice substrate behind the 2024 Denver Psychedelic Cup–winning strain.
- Multi-Flush Durability: Engineered to support consistent yields across multiple harvests.
- Eco-Conscious: Made with sustainable, natural materials — worm castings and coco coir.
Why Grow with HB4
A next-gen substrate built from collaboration between two trusted mushroom brands, HB4 is scientifically refined, competition-proven, and 100% optimized for dung-loving cultivation. HB4 delivers cleaner results, stronger yields, and a premium experience for serious home growers who demand the best.
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- We recommend clean hands, latex or nitrile gloves, and sterile technique when using sterile substrates to reduce the introduction of contaminants.
- Be sure to mix colonized grain spawn thoroughly into your substrate.
- It is best practice to wait a minimum of 1 week after arrival before using sterile substrates to ensure they were not compromised during transit. Rest assured that your purchase is 100% guaranteed. If your substrate was compromised, we will replace it.
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Sterile substrate bags should be stored at room temperature out of direct sunlight. No refrigeration is necessary. They can also be stored for several months before use.
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Our sterile substrates are sterilized in a commercial-grade autoclave. Sterility is verified using biological indicators and temperature sensors.
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North Spore promotes the use of its products for lawful purposes only. North Spore does not encourage the procurement, use or growing of any illegal substance. North Spore does not condone, encourage, facilitate, solicit, or promote any illegal activity. Certain substances are illegal under state and federal laws, and it is the consumer’s responsibility to be informed about the legal status of any substance the consumer grows, procures, or uses.
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