Master's Mix Substrate — 5lb | Premium Wood-Lover's Fruiting Block

🪵 Maximum Yields for Wood-Loving Species

Master's Mix is the substrate of choice for serious growers chasing big flushes from wood-loving mushrooms. Our 5lb fruiting block combines hardwood sawdust with soy hulls — the high-performance formula that delivers exceptional yields from wood-loving species. Autoclave sterilized in a professional mycology facility and ready to use right out of the bag.

📦 What's Inside

5lb of autoclave sterilized Master's Mix:

• Hardwood Sawdust — the structural backbone of the substrate, providing the cellulose and lignin that wood-loving mycelium breaks down to fuel growth
• Soy Hulls — a nutrient-dense supplement that significantly boosts yields compared to straight hardwood alone, with a nutrient profile that wood-loving species absolutely thrive on

✅ Key Features

• 🪵 Master's Mix formula — the gold standard for wood-loving species, trusted by hobby and commercial growers alike
• 🧪 Professional autoclave sterilization — eliminates contaminants before they become your problem
• 🌿 Organic, sustainable ingredients — responsibly sourced from start to finish
• 🌬️ 0.2 micron filter patch — clean gas exchange throughout colonization
• 📦 Ships fresh — we prep bags daily so what arrives at your door is always fresh and ready to perform

🍄 What Grows Best in Master's Mix?

Master's Mix is specifically designed for wood-loving species that thrive on hardwood-based substrates, including:

• 🦁 Lion's Mane — one of the highest yielding species on Master's Mix
• 🌊 Oyster Mushrooms (Pearl, Blue, Pink, Golden) — vigorous, fast-fruiting, and prolific
• 🍄 Shiitake — rich, meaty flushes with excellent flavor
• 🌿 Reishi — slow-growing medicinal species that thrives on hardwood
• And many more wood-decomposing species

🌱 Who Is This For?

• Beginner growers — no sterilization equipment needed, just add your colonized grain spawn and go
• Experienced growers — a reliable, high-yielding substrate that fits any wood-lover workflow

❓ How Do I Use It?

1. Allow your grain spawn to fully colonize
2. Open the bag in a clean environment and mix in your colonized grain spawn
3. Reseal the bag with micropore tape or a heat sealer
4. Allow the substrate block to fully colonize
5. Initiate fruiting conditions, wait for pins, and harvest 🍄

For detailed grow guides and tips, check out our Learn page.

💯 The That Mushroom Guarantee

We stand behind every bag we sell. If something arrives damaged or contaminated, we'll make it right — no hassle, no runaround.