---
product_id: 148907055
title: "‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | North Spore"
brand: "north spore"
price: "$156.45"
currency: USD
in_stock: true
reviews_count: 8
category: "North Spore"
url: https://www.desertcart.ec/products/148907055-boomr-bag-5-lb-manure-based-sterile-mushroom-bulk-substrate
store_origin: EC
region: Ecuador
---

# 5 lb premium sterile substrate Optimized for maximum mushroom yield Proudly made in the USA ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | North Spore

**Brand:** north spore
**Price:** $156.45
**Availability:** ✅ In Stock

## Summary

> 🍄 Grow Big, Grow Bold — The Ultimate Substrate for Serious Shroomers!

## Quick Answers

- **What is this?** ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | North Spore by north spore
- **How much does it cost?** $156.45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/148907055-boomr-bag-5-lb-manure-based-sterile-mushroom-bulk-substrate)

## 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

- • **Pro Spawn Ratio:** Recommended 1:2-3 spawn to Boomr Bag ratio for optimal colonization and growth success.
- • **Trusted & Proven:** Widely used and perfected over years by dedicated mushroom growers for dung-loving species.
- • **Boost Your Harvest:** Formulated by expert mycologists to maximize mushroom yield with a proprietary manure blend.
- • **Ready for Any Setup:** Perfectly hydrated and sterile for monotubs, filter bags, outdoor beds, or humidity-controlled grow rooms.
- • **Simple Storage & Use:** No refrigeration needed; store at room temperature for months without losing potency.

## Overview

The Boomr Bag is a 5-pound sterile, manure-based bulk substrate designed by mycologists to maximize yields of dung-loving mushrooms. Made in the USA with a secret premium blend of composted horse manure and supplements, it’s hydrated to field capacity and trusted by growers for use in various cultivation setups. Easy to store and optimized for a 1:2-3 spawn to substrate ratio, it’s the go-to choice for professional and hobbyist mushroom cultivators aiming for chunky, high-quality harvests.

## Description

desertcart.com : ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | North Spore : Patio, Lawn & Garden

Review: Fabulous - North spore does not disappoint! Great products. I keep ordering. Never any issues.
Review: A little pricey, but worth it! - I got some chonky mushrooms with my Boomr Bag. If you're a newbie, just know that you have to germinate your spores in an agar plate, or BRF jar first.

## 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 |
| Best Sellers Rank | #25,100 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #374 in Garden Soil |
| Customer Reviews | 4.2 4.2 out of 5 stars (1,188) |
| Item Weight | 5 pounds |
| Manufacturer | North Spore |
| Product Dimensions | 8 x 5 x 5 inches |

## Product Details

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

## Images

![‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | North Spore - Image 1](https://m.media-amazon.com/images/I/71UZ-9FQZGL.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

### ⭐⭐⭐⭐⭐ Fabulous
*by C***H on October 10, 2025*

North spore does not disappoint! Great products. I keep ordering. Never any issues.

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

I got some chonky mushrooms with my Boomr Bag. If you're a newbie, just know that you have to germinate your spores in an agar plate, or BRF jar first.

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

I switched to boomr bags after being unsatisfied with other pre-pasteurized substrates and mixing and sterilizing my own. It's not cheap, but the end result is superior. Keep bag for at least a week before using to check for contam. North Spore will replace for free any contaminated bags if you contact them. I've never seen a contaminated bag even after over 20 orders, but I have had to get north spore to replace a grain bag which they did hassle-free. Just take a pic of the contaminated and the lot number sticker on bag and email them. For anyone saying this substrate doesn't work for manure lovers, I'd say you just don't know how to grow mushrooms. A lot of people contaminate batches themselves without realizing it. The bag may come too wet or dry. Too dry, just spray with distilled water during mixing with spawn in sterilized room. Too wet (you can tell if water separates from substrate and you can see liquid in bag) let it dry out by spraying breather patch with alcohol and unfolding bag a little and let sit a few days. Always spray breather port with alcohol before handling or moving it from box. Airborne bacteria can get pulled into bag from patch.

## 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 Ecuador*
*Store origin: EC*
*Last updated: 2026-02-15*