---
product_id: 292191030
title: "North Spore ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms |"
brand: "north spore"
price: "€ 31.41"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.sk/products/292191030-north-spore-boomr-bag-5-lb-manure-based-sterile-mushroom
store_origin: SK
region: Slovakia
---

# 5 lb sterile manure substrate Max yield formula by mycologists Proudly made in USA North Spore ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms |

**Brand:** north spore
**Price:** € 31.41
**Availability:** ✅ In Stock

## Summary

> 🍄 Grow like a pro, harvest like a legend.

## Quick Answers

- **What is this?** North Spore ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | by north spore
- **How much does it cost?** € 31.41 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/292191030-north-spore-boomr-bag-5-lb-manure-based-sterile-mushroom)

## Best For

- north spore enthusiasts

## Why This Product

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

## Key Features

- • **No-Fridge Storage:** Store at room temp for months—convenience meets performance.
- • **Boost Your Harvest:** Scientifically crafted manure blend maximizes mushroom yield for serious growers.
- • **Trusted by the Pros:** Years of refinement and 1,100+ happy growers prove Boomr Bag’s reliability.
- • **Versatile Growing Options:** Perfect for monotubs, filter bags, outdoor beds, or controlled grow rooms.
- • **Ready-to-Use Bulk Substrate:** Hydrated to field capacity—just add spawn and watch your crop thrive.

## Overview

North Spore’s Boomr Bag is a 5 lb sterile, manure-based bulk substrate engineered by expert mycologists to maximize yields of dung-loving mushrooms. Featuring a proprietary blend of composted horse manure and coco coir, it’s hydrated and ready for versatile growing setups. Trusted by over 1,100 growers since 2019, this USA-made substrate offers reliable, high-performance mushroom cultivation without refrigeration.

## Description

Our best-selling Boomr Bag is a sterile manure-based bulk mushroom substrate formulated by mycologists to increase the yield of your grow. It features a proprietary blend of composted horse manure, coco coir, and several quality substrate supplements (although we keep the exact blend a secret!) Over several years, it has been perfected for dung-loving mushroom species and is widely-trusted by mushroom growers. Note: Substrate is hydrated to field capacity. Use Boomr Bag in monotubs, filter bags, and outdoor beds. Or, grow mushrooms from the bag or tray in a humidity-controlled grow room or Martha set up.

Review: It works
Review: A little pricey, but worth it!

## Features

- INCREASE YOUR YIELD: Our best-selling Boomr Bag is a sterile manure-based bulk mushroom substrate formulated by mycologists to increase the yield of your grow.
- PREMIUM MANURE BLEND: It features a proprietary blend of composted horse manure, coco coir, and several quality substrate supplements (although we keep the exact blend a secret!)
- TRUSTED BY GROWERS: Over several years, Boomr Bag has been perfected for dung-loving mushroom species and is widely-trusted by mushroom growers. Note: Substrate is hydrated to field capacity.
- FOR EVERY TYPE OF GROWER: Use Boomr Bag in monotubs, filter bags, and outdoor beds. Or, grow mushrooms from the bag or tray in a humidity-controlled grow room or Martha set up.
- SPAWN TO BULK RATIO: We recommended mixing 1 colonized grain spawn bag with 2-3 Boomr Bags. (Higher inoculation rates may improve your success.)
- STORAGE: Boomr 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.
- BEST PRACTICES: We recommend clean hands, latex or nitrile gloves, and sterile technique when using Boomr Bag to reduce the introduction of contaminants. It is also best practice to wait a minimum of 1 week after arrival before using sterile substrates to ensure they were not compromised during transit.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07TTV73RM |
| Customer Reviews | 4.2 4.2 out of 5 stars (1,120) |
| Date First Available | 26 November 2019 |
| Item volume | 4.75 Liters |
| Manufacturer | North Spore |
| Product Dimensions | 20.32 x 12.7 x 12.7 cm; 2.27 kg |

## Product Details

- **Brand:** North Spore
- **Item weight:** 5 Pounds
- **Style:** Sterile substrate
- **UPC:** 851555008931

## Images

![North Spore ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | - Image 1](https://m.media-amazon.com/images/I/71UZ-9FQZGL.jpg)
![North Spore ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | - Image 2](https://m.media-amazon.com/images/I/71kz5wQRMfL.jpg)
![North Spore ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | - Image 3](https://m.media-amazon.com/images/I/51EQ0acpqeL.jpg)
![North Spore ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | - Image 4](https://m.media-amazon.com/images/I/51w-2+vdTfL.jpg)
![North Spore ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | - Image 5](https://m.media-amazon.com/images/I/715F5iDtowL.jpg)

## Questions & Answers

**Q: how long can the substrate last in the bag?**
A: Not long mine was green when it arrived.

**Q: Do I just need this kit and a spore syringe to grow or would I need something different or additional?**
A: You would want something like rye berries or straw depending on the mushroom. To inoculate with a spore syringe to colonize then mix in this substrate but if you have myceilium already colonized you would just mix it into this substrate. You wouldn't want to just inject this with spores, from my understanding.

**Q: How long will this product last before use when stored properly? And what would be recommended storage if possible?**
A: The sooner you use it, the better. Because it's a sterilized substrate, it will probably be fine for 6 months to a year. I'd keep it in a cool dry place. This is a good option and I've been pleased with the product.

**Q: Where do I acquire a rye, vermiculite, pearlite substrate?  Thanks**
A: amazon, home depot, hydroponic store...... but if you are planning to add it to this substrate you would need to sterilize it.  This bag is made to be used without adding anything to it

## Customer Reviews

### ⭐⭐⭐⭐⭐ It works
*by N***K on 11 February 2026*



### ⭐⭐⭐⭐⭐ A little pricey, but worth it!
*by C***S on 14 December 2025*



### ⭐⭐⭐⭐⭐ Best pre-pasteurized substrate I've found.
*by T***E on 21 January 2023*



## Frequently Bought Together

- ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | North Spore
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- 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 Slovakia*
*Store origin: SK*
*Last updated: 2026-03-22*