---
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: "¥16571"
currency: JPY
in_stock: true
reviews_count: 8
category: "North Spore"
url: https://www.desertcart.jp/products/148907055-boomr-bag-5-lb-manure-based-sterile-mushroom-bulk-substrate
store_origin: JP
region: Japan
---

# 5 lb sterile manure substrate Boosts mushroom yield by optimized formula Mycologist-formulated proprietary blend ‘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:** ¥16571
**Availability:** ✅ In Stock

## Summary

> 🍄 Elevate your mushroom game with Boomr Bag – where science meets nature for peak yields!

## 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?** ¥16571 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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

- • **Trusted by the Pros:** Refined over years and widely used by mushroom cultivators for dung-loving species.
- • **Maximize Your Harvest:** Scientifically crafted manure blend designed to significantly increase mushroom yields.
- • **Versatile Growing Options:** Perfect for monotubs, filter bags, outdoor beds, or humidity-controlled grow rooms.
- • **Long Shelf Life & Easy Storage:** No refrigeration needed; store at room temperature for months without losing potency.
- • **Ready-to-Use Sterile Bulk Substrate:** Hydrated to field capacity and sterile, ensuring contamination-free growth from day one.

## Overview

Boomr Bag is a 5-pound sterile manure-based bulk substrate formulated by expert mycologists to maximize mushroom yields. Featuring a proprietary blend of composted horse manure, coco coir, and premium supplements, it supports dung-loving mushroom species across various growing methods. Trusted by growers nationwide, this ready-to-use substrate requires no refrigeration and offers long shelf stability, making it the go-to choice for professional and hobbyist cultivators alike.

## 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: It works - Good stuff all I use

## 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 |
|---------------|-------|
| Best Sellers Rank | #19,378 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #337 in Garden Soil |
| Brand | North Spore |
| Customer Reviews | 4.2 out of 5 stars 1,191 Reviews |
| Item Weight | 5 Pounds |
| Style | Sterile substrate |
| UPC | 851555008931 |

## 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.

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

Good stuff all I use

### ⭐⭐⭐⭐⭐ 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.

## 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 Japan*
*Store origin: JP*
*Last updated: 2026-02-27*