---
product_id: 525745433
title: "Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Monotubs | Mushroom Substrate"
brand: "boomer shroomer"
price: "$90.14"
currency: USD
in_stock: true
reviews_count: 8
category: "Boomer Shroomer"
url: https://www.desertcart.us/products/525745433-dry-bulk-substrate-for-mushroom-cultivation-coco-coir-vermiculite-gypsum
store_origin: US
region: United States of America
---

# 500g Coco Coir for moisture retention 500g Vermiculite for optimal aeration 100g Gypsum for pH stabilization Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Monotubs | Mushroom Substrate

**Brand:** boomer shroomer
**Price:** $90.14
**Availability:** ✅ In Stock

## Summary

> 🍄 Cultivate Confidence: Premium substrate for unstoppable mushroom yields!

## Quick Answers

- **What is this?** Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Monotubs | Mushroom Substrate by boomer shroomer
- **How much does it cost?** $90.14 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/525745433-dry-bulk-substrate-for-mushroom-cultivation-coco-coir-vermiculite-gypsum)

## Best For

- boomer shroomer enthusiasts

## Why This Product

- Trusted boomer shroomer brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Bulk Powerhouse:** Produces 10 lbs of pasteurized substrate—enough for two full monotub grows, maximizing your harvest potential.
- • **Effortless Prep:** Just add boiling water and pasteurize for 24 hours—simple, foolproof hydration for busy cultivators.
- • **Woman-Owned Quality:** Backed by Ashley’s expert support and a community of passionate mycologists—join the movement cultivating success.
- • **Balanced Growth Environment:** Premium CVG blend ensures ideal moisture, airflow, and pH balance for vigorous mycelial expansion.
- • **Versatile & Beginner-Friendly:** Perfect for monotubs, trays, or filter bags—trusted by novices and pros alike for consistent results.

## Overview

Boomer Shroomer Dry Bulk Substrate combines 500g coco coir, 500g vermiculite, and 100g gypsum to create 10 pounds of pasteurized substrate, ideal for two monotub mushroom grows. Designed for optimal moisture retention, aeration, and pH balance, this beginner-friendly mix simplifies preparation with just boiling water and 24-hour pasteurization, delivering reliable, high-yield cultivation supported by expert customer care.

## Description

desertcart.com : Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Monotubs | Mushroom Substrate : Patio, Lawn & Garden

Review: I love Boomer Shroomer! Always on point! - I love this brand. Ashley is great too work with if you have any questions. She always gets back and very helpful and pleasant! These are quality sterile products you can count on. Always a fruitful result 🍄 🍄 Great, easy to follow instructions included. Woman owned company! Buy Boomer shroomer! Thank you Ashley 😊
Review: This is an excellent substrate that 100% works. Sanitize and Sanitize again! :) - Excellent quality substrate mix. The price is also more than reasonable. I was able to make out 2 monotubs and 6 shoe boxes with what I got from this kit and still have a least a quart left over. Heat or pressure sterilization before you use this substrate or any online bought substrate is critical. This simply mean you have to mix the substrate mixture with boiling water or pressure cook it. Also it can't be just kind of hot or luke-warm. The water has to be at a rolling boil when you pick it up to dump it in. I have used two methods the first is the easiest: I put my substrate mix in a generic hardware store bucket (make sure when you get one you include a sealing lid preferably with a rubber gasket! Hit it with iso when you get it home for good measure!) from there you put whatever ammount of boiling water; you have decided to use I honestly kind of wing it every time. I just make sure that the ammout of water I add is sufficient to cover the mix. Then once boiled-water is poured in put the lid on the bucket (yes the plastic will be hot and the lid will swell) the heat that is trapped in the bucket with the substrate will kill off all the microbes, bacteria, mold, mildew, etc. you have to let it sit for at least 8 hours in my experience if you try mixing your grainspawn with this super heated substrate the small ammount of still escaping steam will cook your mycelium alive like an omlet so don't rush it (it's also really easy to misjudge how hot the substrate is then burning your hand when reaching in to grab some, so be careful!) The second method just replaces the bucket with a large gasketed cooler with toggle locks. I just figured out that I can microwave the substrate to purify it as well so I got a large cheapo microwave off FB market and I use it only for sterilizing substrate and genetics saving equipment like glass petri dishes. It should be well thought out that this isnt a one time sanitize all thing - you can develop a contaminated substrate in your bucket while waiting to use it for another tub weeks later. That's where the microwave came in for me now I can dole out as much as I want and steam it clean in the microwave. So far I havent had any contams. I have how ever had some serious success! Thanks my myco peeps and I hope this helps someone.

## Features

- Premium CVG Bulk Substrate — Includes 500g coco coir, 500g vermiculite, and 100g gypsum, the ideal coco-coir, vermiculite & gypsum blend for mushroom cultivation.
- Just Add Boiling Water — Easily hydrate in a 5-gallon bucket using 16 cups of boiling water, then pasteurize for 24 hours to reach optimal field capacity.
- Large Yield for Multiple Flushes — This dry mix makes about 9 lbs of hydrated bulk substrate, enough for two full monotub grows or other fruiting setups.
- High Moisture Retention & Aeration — Coco coir offers water-holding capacity, vermiculite adds air pockets, and gypsum stabilizes pH — creating a balanced environment for strong mycelial growth.
- Versatile & Beginner-Friendly — Perfect for spawn-to-bulk transfers (S2B) in monotubs, trays, or filter bags; a popular and reliable choice for both new and experienced mycologists.
- Any questions or concerns please contact Ashley at ashley@boomershroomer.com

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C21QDHXX |
| Best Sellers Rank | #12,746 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #477 in Garden Fertilizers |
| Customer Reviews | 4.7 4.7 out of 5 stars (258) |
| Item Weight | 2.53 pounds |
| Item model number | BSBULK001 |
| Manufacturer | Boomer Shroomer |
| Product Dimensions | 12 x 9 x 3 inches |

## Product Details

- **Brand:** Boomer Shroomer
- **Global Trade Identification Number:** 00196852195749
- **Style:** Coco Coir,Vermiculite
- **UPC:** 196852195749

## Images

![Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Monotubs | Mushroom Substrate - Image 1](https://m.media-amazon.com/images/I/71-0PHHRPPL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ I love Boomer Shroomer! Always on point!
*by J***C on January 13, 2026*

I love this brand. Ashley is great too work with if you have any questions. She always gets back and very helpful and pleasant! These are quality sterile products you can count on. Always a fruitful result 🍄 🍄 Great, easy to follow instructions included. Woman owned company! Buy Boomer shroomer! Thank you Ashley 😊

### ⭐⭐⭐⭐⭐ This is an excellent substrate that 100% works. Sanitize and Sanitize again! :)
*by M***N on February 1, 2025*

Excellent quality substrate mix. The price is also more than reasonable. I was able to make out 2 monotubs and 6 shoe boxes with what I got from this kit and still have a least a quart left over. Heat or pressure sterilization before you use this substrate or any online bought substrate is critical. This simply mean you have to mix the substrate mixture with boiling water or pressure cook it. Also it can't be just kind of hot or luke-warm. The water has to be at a rolling boil when you pick it up to dump it in. I have used two methods the first is the easiest: I put my substrate mix in a generic hardware store bucket (make sure when you get one you include a sealing lid preferably with a rubber gasket! Hit it with iso when you get it home for good measure!) from there you put whatever ammount of boiling water; you have decided to use I honestly kind of wing it every time. I just make sure that the ammout of water I add is sufficient to cover the mix. Then once boiled-water is poured in put the lid on the bucket (yes the plastic will be hot and the lid will swell) the heat that is trapped in the bucket with the substrate will kill off all the microbes, bacteria, mold, mildew, etc. you have to let it sit for at least 8 hours in my experience if you try mixing your grainspawn with this super heated substrate the small ammount of still escaping steam will cook your mycelium alive like an omlet so don't rush it (it's also really easy to misjudge how hot the substrate is then burning your hand when reaching in to grab some, so be careful!) The second method just replaces the bucket with a large gasketed cooler with toggle locks. I just figured out that I can microwave the substrate to purify it as well so I got a large cheapo microwave off FB market and I use it only for sterilizing substrate and genetics saving equipment like glass petri dishes. It should be well thought out that this isnt a one time sanitize all thing - you can develop a contaminated substrate in your bucket while waiting to use it for another tub weeks later. That's where the microwave came in for me now I can dole out as much as I want and steam it clean in the microwave. So far I havent had any contams. I have how ever had some serious success! Thanks my myco peeps and I hope this helps someone.

### ⭐⭐⭐⭐⭐ Best bag to grow mushrooms
*by R***F on March 4, 2026*

out of all the different bags I believe these are the best

## Frequently Bought Together

- Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Boomer Shroomer Inflatable Monotub
- Boomer Shroomer Inflatable Monotub Kit, Mushroom Growing Kit Includes a Drain Port, Plugs & Filters, Removeable Liner [Patent No: US 11,871,706 B2]
- Myco Labs Premium 5-Grain Mushroom Spawn Bags | Sterilized Grain Spawn | Injection Ports | 2 Quarts Each Bag | 2 Bags per Box

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-16*