---
product_id: 453951439
title: "North Spore 'Boomr Bag' Sterile Mushroom Bulk Substrate, Manure-Based, 5 lb"
brand: "north spore"
price: "8861 kr"
currency: ISK
in_stock: false
reviews_count: 5
url: https://www.desertcart.is/products/453951439-north-spore-boomr-bag-sterile-mushroom-bulk-substrate-manure-based
store_origin: IS
region: Iceland
---

# 5 lb sterile manure-based substrate Formulated for maximum mushroom yield Proudly made in the USA North Spore 'Boomr Bag' Sterile Mushroom Bulk Substrate, Manure-Based, 5 lb

**Brand:** north spore
**Price:** 8861 kr
**Availability:** ❌ Out of Stock

## Summary

> 🍄 Grow like a pro with Boomr Bag — the secret weapon for next-level mushroom yields!

## Quick Answers

- **What is this?** North Spore 'Boomr Bag' Sterile Mushroom Bulk Substrate, Manure-Based, 5 lb by north spore
- **How much does it cost?** 8861 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/453951439-north-spore-boomr-bag-sterile-mushroom-bulk-substrate-manure-based)

## 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

- • **Boost Your Harvest:** Scientifically crafted manure blend maximizes mushroom growth and yield.
- • **Trusted by Experts:** Years of refinement and glowing reviews from dedicated mushroom cultivators.
- • **Versatile Growing Options:** Perfect for monotubs, filter bags, outdoor beds, or humidity-controlled setups.
- • **Long Shelf Life & Easy Storage:** No refrigeration needed; store at room temperature for months without losing potency.
- • **Ready-to-Use Sterile Substrate:** Pre-pasteurized and hydrated to field capacity for hassle-free inoculation.

## Overview

The Boomr Bag is a 5 lb sterile, manure-based bulk substrate designed by mycologists to significantly increase yields of dung-loving mushrooms. Featuring a proprietary blend of composted horse manure, coco coir, and premium supplements, it’s pre-pasteurized and hydrated for immediate use. Trusted by growers nationwide, this USA-made substrate supports versatile growing methods and offers long shelf stability 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: The product is the best - Price seems to be in little inflated to make up for delivery. But excellent product.
Review: North Spore Rocks! - Great products and excellent customer service. Boomr Bag is like a shroom cheat code!

## 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 |
| Brand | North Spore |
| Customer Reviews | 4.3 out of 5 stars 1,178 Reviews |
| Global Trade Identification Number | 00851555008931 |
| Item Highlight | Filter Patch Bag for Monotubs & Bulk Grows, Dung-loving Species, Mycologist-formulated, Made in USA Item Highlight Filter Patch Bag for Monotubs & Bulk Grows, Dung-loving Species, Mycologist-formulated, Made in USA See more |
| Item Weight | 5 Pounds |
| Manufacturer | North Spore |
| Number of Packs | 1 |
| Style | Sterile substrate |
| UPC | 851555008931 |
| Unit Count | 2365.88 Milliliters |
| Volume | 4.75 Litres |

## Product Details

- **Brand:** North Spore
- **Global Trade Identification Number:** 00851555008931
- **Item Weight:** 2.27 kg
- **Style:** Sterile substrate
- **UPC:** 851555008931

## Images

![North Spore 'Boomr Bag' Sterile Mushroom Bulk Substrate, Manure-Based, 5 lb - Image 1](https://m.media-amazon.com/images/I/71UZ-9FQZGL.jpg)
![North Spore 'Boomr Bag' Sterile Mushroom Bulk Substrate, Manure-Based, 5 lb - Image 2](https://m.media-amazon.com/images/I/71kz5wQRMfL.jpg)
![North Spore 'Boomr Bag' Sterile Mushroom Bulk Substrate, Manure-Based, 5 lb - Image 3](https://m.media-amazon.com/images/I/51EQ0acpqeL.jpg)
![North Spore 'Boomr Bag' Sterile Mushroom Bulk Substrate, Manure-Based, 5 lb - Image 4](https://m.media-amazon.com/images/I/51w-2+vdTfL.jpg)
![North Spore 'Boomr Bag' Sterile Mushroom Bulk Substrate, Manure-Based, 5 lb - 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

### ⭐⭐⭐⭐⭐ The product is the best
*by B***D on 26 August 2026*

Price seems to be in little inflated to make up for delivery. But excellent product.

### ⭐⭐⭐⭐⭐ North Spore Rocks!
*by T***O on 4 September 2026*

Great products and excellent customer service. Boomr Bag is like a shroom cheat code!

### ⭐ Very disappointed
*by J***R on 30 October 2024*

Thought this was suppose to be one of the best substrates out there to use. It takes time to grow and I’m using for personal use so I only do a few grow bags at a time. With in 6 months when I went to use I noticed bugs in my substrate. Now I kept indoors, I folded and clipped the bag tight when not in use and it was stored in the original bag, box in a closed cabinet. When I looked further I saw it was infested with gnat bugs and I felt like it was no longer usable for indoor use. It was over the return time so it was a complete waste of money on my end. If you’re using for a large grow at one time then it might be better but not in my case. I already disposed of it and did not take pictures because when I noticed this I just wanted to get it out of the house.

## 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
- North Spore Organic Sterilized Hydrated Grain Bag w/Self-Healing Injection Port | Sterile Mushroom Spawn Bags w/ 0.2 Micron Filter Patch | USDA Certified Organic (1 Pack)
- 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 Iceland*
*Store origin: IS*
*Last updated: 2026-09-27*