Rated 5.0 out of 5 stars
22 Reviews

Grain Spawn Bag (3lb) - Mushroom Grain Bag - Sterile

Sale price$14.99

🍿 3LB Bag of Milo Grain
💨 Injection Port and Filter Patch
💦 Pre-Hydrated & Sterilized

13% OFF
17% OFF
17% OFF

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  • USDA Organic USDA Organic
  • Hand Made Hand Made
  • Fast Shipping Fast Shipping
  • Free Support Free Support
  • Highly Rated Highly Rated
  • Free Return Free Return
  • Discrete Box Discrete Box
  • Small Business Small Business

🍿【3LB Bag of Milo Grain】-Nutrient-rich option for optimal mushroom cultivation

🏬【Check Store for Bundles】-See store for bundled specials!

🦠【100% Sterile】-Sterilized for 2 Hours @ 17 psi in an industrial autoclave.Sealed behind a HEPA Flowhood.

🦄【Unicorn Bag】-Only the highest and thickest quality plastic bags are used. No cheap thin chinese bags.

💉【Injection Ports】-Inject your chosen spores or directly into the bag. No tape needed. Self healing.

💸【Competitive Prices】-Our prices are designed to help you get the best possible price. Helping you grow spores at the best price!



  • Grain Type: Milo (3lb)

Our Process

We take no shortcuts. This provides perfect results. We don't accept anything less than perfect.

Here's my process:

  1. [Step 1] - 24 hour soak w/ gypsum.
  2. [Step 2] - 15 minute simmer.
  3. [Step 3] - 60 minute dry off.
  4. [Step 4] - Fill .2 micron Unicorn.
  5. [Step 5] - 90 minute PC @ 17psi.
  6. [Step 6] - Seal bags w/ flowhood.

Many people take shortcuts to speed up their production. Many use "No Soak" or "No Simmer" Tek.

 Patience + Care = Phenomenal results.

 Just bring your own (clean) spores/culture.

Why Choose ZombieMyco’s Mushroom Grain Spawn?

We don't take shortcuts. We take the time to nurture and produce products. We don't rush things, all because quality takes time. We make sure to deliver the best to our customers.

What Our Customers Are Saying

"So far, so good! This product has met my expectations and made my workflow smoother” - Jake"

"I'd say this product does the job decently well” -Jeff

"I've been pleasantly surprised by the results with this product. It's been a reliable addition to my process”-Carl V.

Ready to take your mushroom cultivation to the next level?

Zombie Myco is here to provide the best quality mycology supplies.

Explore Related Products | Contact Us for More Information

Grains | All in One | Substrate | Agar | Liquid Culture | Equipments | Supplies


  • Arrival Times: See item in cart checkout for accurate arrival times.
  • Processing Times: Most orders can be processed within 0-2 days. Small orders will be processed same day if ordered before 1pm.
  • International Orders: Buyers are responsible for any customs and import taxes that may apply. Seller is not responsible for delays due to customs.
  • Returns accepted on equipment & supplies.
  • Product must be unopened in original manufacturers packaging.
  • Returns accepted for 7 days.
  • Customer provides return shipping.
  • No restocking fees to buyer.
  • Final sale items: Perishable products (grain, substrate, all in ones, agar, liquid culture, cultures) are not returnable.

IF YOUR ITEMS ARRIVES DAMAGED: Reach out to our support team so we can make it right for you. 💪💪

Grain Spawn Bag (3lb) - Mushroom Grain Bag - Sterile
Sale price$14.99

What's in The Box?

we like to be transparent

Discrete Box

Contents shipped in a plain, unmarked brown box. The return to sender name is also discrete.

Red Milo

Red Milo is a very dense grain providing an abundant nutrition source but also provides protection agains wet rot.

Unicorn Bag

We use brand name expensive Unicorn Bags so you have less bag breakages and performance.

Injection Port

Don’t open the bag! Just inject your spores / culture through the bag injection port. Easy peasy!

Filter Patch

The filter allows gas exchange inside the bag giving proper growing conditions without ever opening!

Instruction Card

Full instruction card with scannable QR code. Follow step by step directions to increase success rates!

Free Sticker

Custom designed vinyl sticker. New stickers added monthly. Collect them all!

Alcohol Wipe

Wipe down your injection port prior to injecting the bag!

Nitrile Gloves

Practice proper sterile procedures and make sure you start off on the right foot contamination free!


Gypsum helps ph balance the bulk substrate providing optimal growing conditions.
Rated 5.0 out of 5 stars
Based on 22 reviews
Total 5 star reviews: 21 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
95%would recommend this product
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22 reviews
  • RW Profile picture for RALPH W.
    RALPH W.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 months ago
    Spawn bags

    So far so good. Bags were perfect. Injected all 4 bags and am for waiting colonization.

  • BS Profile picture for Brian S.
    Brian S.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 months ago
    Best quality/value out of 4 different Myco vendors

    Ironically I stumbled across your site immediately after i made a purchase from a different Mycology equipment supplier. Ive made purchases of All in one grow bags, grain spawn, and several other small items from 3 other vendors over the past 3 months. I purchased 5-6 bags from each vendor the first vendor sent 6 bags, 3 were contaminated when they arrived so i tossed the other 3 because there was no refunds second vendor i bought 5 bags 2 arrived contaminated, i attempted to innoculate 2 of the 3 remaining bags was disappointed when i lifted them and the bottome split open. Bags were cheap and got brittle and basically shattered. Vendor 3 supplied clean bags, but i messed up and contaminated 2 of 3 bags.

    I was pretty jaded with mycology when i found your site (your web site is THE BEST myco site out there btw) I purchased a 3 pound bag of grain spawn as well as a monthly subscription for10 3lbs bags because it was the best value. Got them a week later. Packaged securely, quality grains in quality bags and out of 11 inoculations using 4 different strains of mushrooms, i have 11 clean successful inoculations.

    Already looking forward to next month's recurring delivery.

    And thanks for that awesome sticker you included! Love it!!!

    ZM Profile picture for Zombie Mushrooms
    Zombie Mushrooms
    2 months ago

    Brian! Heck yeah!! 🤘💚👍 We love to hear these stories. Unfortunately we hear the horror stories too often and we work hard to make mycology easy and ENJOYABLE. We are are happy your order worked out and welcome you to the zombie fam.

  • V
    Flag of United States
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    10 months ago
    5 Stars

    Their customer service is beyond amazing 🤩

  • A
    I do not recommend this product
    Rated 4 out of 5 stars
    2 months ago
    4 Stars

    First bag had issues before injection and the owner sent me another to replace it. Will update after second bag. 4 stars for customer service fs !

  • YW
    Yaxi W.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 months ago
    Worked great no contam

    Easy to use as a beginner. No contamination in either bag I purchased

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