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Choosing the Right Mushroom Growing Substrate
Your mushroom growing substrate is the nutrient bed that colonized spawn fruits from — it supplies the moisture, structure, and food that turn a small bag of spawn into pounds of mushrooms. There’s no single best substrate: wood-loving species want something very different from grassland species, and a beginner is better served by a simple mix than a rich one. Match the substrate to what you’re growing and how dialed-in your sterile technique is.
| Substrate type | Best for | Why growers choose it |
|---|---|---|
| CVG (coco coir, vermiculite, gypsum) | Most cultivated species; beginners | The proven default — simplest to work with and the lowest contamination risk |
| Manure-based blends | Grassland species; experienced growers | Extra nitrogen and micronutrients that can push bigger yields, with more sensitivity to handling |
| Wood-based (Master’s Mix & hardwood) | Lion’s mane, shiitake, oyster & other wood-lovers | Supplemented sawdust these species require — they won’t fruit well on CVG |
| Coco coir bricks | Growers mixing their own | Compressed raw coir to hydrate and blend into a custom substrate at the lowest cost per pound |
| Specialty blends & casing layers | Niche species and methods | Custom-formulated mixes for advanced grows |
Shop Substrate by Type
- Bulk Substrate Bags
- Manure-Based Substrate
- Wood-Based Substrate
- Specialty Substrate & Kits
- Grain Spawn
- Monotub Grow Kits
Mushroom Substrate FAQ
What is mushroom substrate?
Mushroom substrate is the growing medium that colonized mycelium feeds on and fruits from. It provides moisture, structure, and nutrients — commonly coco coir with vermiculite and gypsum, manure-based blends, or supplemented hardwood sawdust, depending on the species you’re growing.
What’s the difference between sterilized and pasteurized substrate?
Sterilized substrate is heat-treated to eliminate essentially all competing organisms — necessary for nutrient-rich media like supplemented sawdust. Pasteurized substrate is treated at a lower temperature, which knocks back competitors while leaving some beneficial microbes behind. Bulk substrates like CVG are typically pasteurized; wood-based blends like Master’s Mix are sterilized.
Which substrate should I use for my mushroom species?
Wood-lovers such as lion’s mane, shiitake, and oyster need a wood-based substrate. Most other cultivated species do well on CVG from our bulk substrate bags, with manure-based blends as a step up for experienced growers.
What’s the difference between substrate and grain spawn?
Grain spawn is colonized grain carrying the living mycelium — it’s the starter. Substrate is the much larger bulk material you mix that spawn into so the mycelium can spread out and fruit. You need both: spawn supplies the culture, substrate supplies the growing mass.
Can I make my own mushroom substrate?
Yes. Start with a compressed coco coir brick, hydrate it, and mix in vermiculite and gypsum to make your own CVG. It’s the cheapest route per pound, but you handle hydration and heat treatment yourself — ready-made bags ship already hydrated to field capacity and heat-treated.
How much substrate do I need for a monotub?
Match the bag to the tub: roughly a 5 lb bag for a 28Q tub, 7.5 lb for a 44Q, and about 15 lb (or a 30 lb multi-pack across two tubs) for a 66Q. Full size-by-tub details are on the bulk substrate bags page.