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8-Pack Organic Sterilized Grain Spawn Bags

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8-Pack Organic Sterilized Grain Spawn Bags

64 Reviews
$176.00$158.00

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Certifications USDA certified organic
Moisture content Hydrated to a target of 50%
Carton size 8 bags (24 lbs)
Bag weight 3 lbs each

A $176 value!

Our best-selling organic sterilized grain spawn bag was formulated by mycologists to maximize the speed and size of your mushroom grow. (All that's required is a spore syringe or liquid culture!)

Each spawn bag contains our proprietary grain blend featuring hydrated, nutrient-rich, organic millet and wheat berries. Bags also include a self-healing injection port for use with a spore or culture syringe plus a 0.2 micron filter patch to block airborne contaminants while providing even gas exchange. (Note: Color of injection port may vary.)

Why millet?

Millet has a much lower endospore load than rye and wheat, making it less prone to contamination. And its small size means your spawn will have many more inoculation points for the same volume of grain. By using millet, the mycelium will spread more evenly and abundantly through the substrate. And, as a high-nutrient medium, it also encourages rapid mycelial expansion.

Sterilization

North Spore grain spawn bags are sterilized in a commercial-grade autoclave. Sterility is verified using biological indicators and temperature sensors.

Spawn to bulk ratio

We recommended 1 lb of colonized grain spawn for every 5 lbs of manure or hardwood sterile substrate. We also recommend using 2.5-5ccs per 3 lb injection port bag. (See Inoculation and Colonization below for full details.)

Recommended add-ons

Customer Reviews
5.0 Based on 65 Reviews
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Filter Reviews:
AK
03/08/2025
ALEXANDER K.
United States
I recommend this product

Value is great

I value is unbelievable only down side is I don’t think I have the set yet to work thru them all in time!

03/08/2025

North Spore

We really appreciate the kind review, Alexander! We're so glad you are enjoying everything so far.

LG
01/03/2025
Larz G.
United States

Working well!

I inoculated several bags of these and some are colonizing, and some have been sent to produce fruit. Pleased with these bags so far!

01/03/2025

North Spore

So great to hear you are enjoying the products so far, Larz. Don't hesitate to reach out if you ever need anything!

DB
01/02/2025
Dez B.
United States

Grain

Arrived quickly and looks just like the picture. I have not had any issues. I will buy again and again and again!

01/03/2025

North Spore

Thank you so much for the continued support, Dez! We so appreciate customers like you!

J
11/11/2024
Jackie
United States
I recommend this product

The best grain bags on the market.

I love my NS grain bags. I tried making my own in jars or other brands and I kind of knew I'd end up liking NS the best. I am a lifer.

11/12/2024

North Spore

We're glad to be a part of your practice! We appreciate the review, Jackie.

SE
11/10/2024
Shane E.
United States
I recommend this product

Very Clean

No contamination

11/10/2024

North Spore

Thanks for sharing, Shane!

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8-Pack Organic Sterilized Grain Spawn Bags

8-Pack Organic Sterilized Grain Spawn Bags

$176.00$158.00
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