Midwest's Select Bulk Substrate Casing Mix - 7.5 pounds
Midwest's Select Bulk Substrate Casing Mix - 7.5 pounds is backordered and will ship as soon as it is back in stock.
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Midwest's Select Bulk Substrate Casing Mix - 7.5 pounds
Description
Description
Midwest's Select Bulk Substrate Casing Mix – 7.5 Pounds
Pasteurized • Hydrated • Ready to Use
Take the guesswork out of bulk mushroom growing with Midwest’s top-selling Select Bulk Substrate, now available in a convenient 7.5 lb bag. Specially crafted for grain or dung-loving mushrooms, this premium mix is fully hydrated, pasteurized, and ready to use right out of the bag—perfect for monotubs, totes, or container grows.
Designed for the popular bulk or monotub method, our Select Bulk Casing Mix blends all the essential elements for successful fruiting—no measuring or mixing required.
Ingredients Matter
Our proven recipe includes:
- Coco Coir – Naturally mold-resistant and beloved by mushrooms
- Vermiculite – Adds moisture retention and aeration
- Gypsum & Hydrated Lime – Balance pH and boost structure
- pH Buffers & Stabilizers – Maintain a consistent, grow-friendly environment
- Mineral Water – Enhances hydration with added micronutrients
- Select Additives – To resist mold and bacteria while supporting strong colonization
We pasteurize, not sterilize—preserving the natural antimicrobial benefits of coco coir for enhanced contamination resistance.
Product Highlights
- 7.5 LB Pre-Hydrated & Pasteurized Bag
- Perfect for 30–44 QT Containers & Our Grower’s Select Monotub
- Shelf Life: Up to 6 Months (Fridge/Freezer Storage)
- Field Capacity Achieved – Just open and mix with your fully colonized spawn
- PDF Bulk Grow Guide Included
The Midwest Advantage:
We’ve spent years perfecting this formula, and it continues to be our #1 selling product every month. Whether you're fruiting spawn bags, grain jars, or a monotub setup, our Select Bulk Substrate ensures reliable, robust growth and helps resist contamination better than any competing blend we've tested.
Let customers speak for us
Ordered 5-Tier, very easy set up. I searched YouTube videos to make sure I set it up correctly. Perfect size, exactly what I was looking for. My mushrooms started coming out. Highly recommended
Jars came as described. I would buy again.
Well I bought one and a week later I bought another one and a week after that I bought another 😂 so I have 3 stacked up on each other and they work amazing!
For the price I thought it was going to be small, but its not. Its a great deal. I grow for personal and it gets the job done. There's more than enough space for what I need it for. I included a picture with a cigarette light for a frame of reference to the size
Awesome and easy to setup/understand how everything works
These little jars were great for turning spores into ready to use mycelium culture. I could see the spores germinating with in 4 days after I added spores. I can’t wait to use the mycelium when it’s ready!
5 grain spawn jars
Horse Manure Substrate
Cow Manure Substrate
Good stuff✌🏻
Good stuff i prefer the 5 pounders because then i have no left over substrate but for my bigger tubs the 7.5 lb bags are the answer
Just what we needed, worked great, and saved a little putting on our own injection ports
Fast shipping! I’m always satisfied with my purchases. I have been quite successful transferring the bags into a small monotub. Will continue to be a customer. NOT a paid review! 🙅🏻♂️
I was needing something with amuch smaller footprint the bigger tubs were getting in the way a lot. The only gripe I ever have is that the Midwest growkit systems always come with these weird detachable handles that look like something that a dog would like to chew up, or would be easy to misplace... Other than that love you guys, last month I got the Spore culture bottles 30 ml and expanded my pleurotus eryngii culture
It's awesome being able to do microscopy in mycology at home just because I'm weird.
Very easy to use and set up. Yield is as advertised. This is my new go to grow method.
Man I am excited greatly!!!!! Ahahahahhhaahahaha
New to Research, heard complaints of other Company's all-in-one bags getting Contaminated, many recommended Midwest. I know my process wasn't perfect and your bag made it to fruiting. Maxing out Strain size and shape, matching strain descripton and color. Ordered 5 more bags and 2 heating mats.
Ive ordered upwards of 50 bags of this substrate and only had 1 issue so its safe to say this is a quality product every bag has usherd in a succesful flush of my favorit strains so buy it
