Monotub Kits & Refills

⭐ Trusted by growers nationwide

Complete kits are for starting fresh. Refill kits are for reloading your next run.

Choose from 6qt and 12qt shoebox refills or scale up to small, medium, large, and extra large monotub kits.

No prep. No pressure cooking. No guessing.

New? Start with a Complete Kit.
Already growing? Grab a Refill Kit.
Complete Kits • Shoebox Refills • Monotub Refill Kits

Monotub Kits & Refill Packs That Keep Your Grows Simple, Clean, and Ready to Run

Whether you are starting from scratch or reloading an existing setup, this collection brings together our complete mushroom monotub kits, shoebox refill kits, and monotub refill kits so you can choose the right size without the guesswork. Each option is built around ready-to-use sterile grain and quality substrate to make your next run easier, more consistent, and more straightforward.

⭐ Great for beginners who want a complete mushroom monotub setup in one place
📦 Easy refill options for growers who already have tubs and just need grain + substrate
⚡ From compact shoebox runs to larger monotub reloads, there is a kit for every workflow

Complete Kits vs Refill Kits — Which One Do You Need?

This page includes both complete mushroom growing kits and refill packs. If you are new and want a ready-to-go setup, start with a complete kit. If you already own a tub and just need fresh materials, go with a refill. That simple distinction helps most growers find the right product in seconds.

Complete Kits

Best for first-time growers or anyone who wants a simple, all-in-one starting point.

  • Includes the tub plus the growing materials
  • Great for learning the process without sourcing extra parts
  • Ideal when you want a straightforward, ready-to-build setup
Shop Small Complete Kit Shop Medium Complete Kit

Refill Kits

Best for returning growers who already have a tub and want clean, reliable materials for the next run.

  • Includes grain and substrate only
  • Perfect for shoebox tubs, mini monotubs, and larger monotubs
  • Helps you restock fast without rebuilding your whole setup
6qt Refill 12qt Refill Small Refill Medium Refill Large Refill Extra Large Refill

Not Sure What To Choose?

Use this quick guide to find the right monotub kit or refill kit for your setup, your space, and your comfort level.

First grow ever Start with a complete kit so you get the tub and the core materials in one order.
Small, low-commitment run Go with the 6qt or 12qt refill if you want a compact project that is easy to manage.
Standard monotub workflow A small or medium monotub refill kit is a strong fit for growers who already know their setup.
Bigger output Choose the large or extra large refill kits when you want more substrate, more grain, and more room to scale.

Shop by Size and Setup

From shoebox tubs to larger monotub refills, this collection is built to make it easier to buy the right sterile grain and substrate combination for your next run.

Complete Kit

Small Complete Kit

Great beginner option with a compact monotub setup and a balanced grain-to-substrate combo.

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Complete Kit

Medium Complete Kit

For growers who want a little more room while still keeping the process simple and organized.

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Shoebox Refill

6qt Refill Kit

Compact and efficient. A strong choice for small tubs, testing, or simple low-footprint runs.

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Shoebox Refill

12qt Refill Kit

A step up from the 6qt option for growers who want more substrate and a little more room to work.

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Monotub Refill

Small & Medium Refills

Great for steady, repeatable monotub runs when you already have the tub and just need fresh materials.

Small Refill Medium Refill
Monotub Refill

Large & XL Refills

Built for bigger monotub reloads and growers who want a more substantial grain and substrate package.

Large Refill Extra Large Refill
No more guessing if your grain or substrate is the problem. Start with clean, ready-to-use materials designed to make your setup simpler and your workflow more repeatable.

What You’re Getting with These Kits

These products are built for growers who want to spend less time sourcing parts and more time actually running their setup. Depending on the option you choose, you are getting a combination of sterile grain spawn, CVG substrate, and in the case of complete kits, the tub and core components needed to get started.

In the Complete Monotub Kits

  • Monotub setup
  • Sterile grain bag
  • Hydrated substrate
  • Core airflow / tub components
  • A simpler path for first-time growers

In the Refill Kits

  • Sterile grain ready for inoculation
  • Hydrated substrate ready for mixing
  • Balanced options for shoebox tubs and monotubs
  • A fast way to reload an existing setup
  • No need to re-buy the tub every time

How the Basic Workflow Works

Whether you choose a compact shoebox refill or a larger monotub kit, the overall workflow stays simple. That is one of the biggest reasons growers like these systems.

1

Inoculate the Grain

Start with the sterile grain bag and let it colonize fully in a clean, stable environment.

2

Mix with Substrate

Once colonized, combine the grain with the included substrate and load your tub or chosen setup.

3

Let It Run

Allow the substrate to colonize, then introduce fruiting conditions and keep your environment dialed in.

Start small if you want to keep things simple. Scale up later with larger refill kits once you know what size and workflow you enjoy most.

Helpful Collections to Pair with Your Monotub Setup

If you want to round out your order, these collections make strong companion products for monotub growers.

Sterile Grain Bags

Stock up on clean grain options for future runs or custom setups.

Sterile Substrates

Browse CVG and other substrate options for refills, experiments, or bulk orders.

Agar Plates & Agar Supplies

Helpful for growers who want to work cleaner, test cultures, or improve consistency.

Lab Supplies

Find filters, tape, ports, and other useful extras that support a cleaner workflow.

Monotub Kit & Refill FAQ

What is the difference between a complete kit and a refill kit?
A complete kit includes the tub setup plus the growing materials. A refill kit is for growers who already have a tub and just need fresh grain and substrate for the next run.
Which option is best for beginners?
Most beginners are best served by a complete kit because it removes a lot of the setup decisions. If you already own tubs and just want materials, a refill kit may make more sense.
Should I choose a shoebox refill or a monotub refill?
Choose a shoebox refill if you want a smaller, easier-to-manage run. Choose a monotub refill if you already run larger tubs or want to scale up from smaller projects.
Can I start small and scale up later?
Yes. That is one of the best parts of this collection. Many growers start with a 6qt or 12qt setup, learn the workflow, then move into small, medium, large, or extra large monotub refill kits over time.

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Let customers speak for us

from 838 reviews
Simple Mushroom Substrate - Ready-to-Use CVG/CVA Mix for Beginners
RICK ZIMMERMAN
Substrate review

The substrate had a perfect moisture content .Ive used it 5 times now with great results. There grains and drippy corn are really good to.

Simple Mushroom Substrate - Ready-to-Use CVG/CVA Mix for Beginners
Sorghum Yeast Agar Plates (SYA) – Pre-Poured Sterile Agar Plates
D.V.

Consistent lab work quality!!

Sorghum Yeast Agar Plates (SYA) – Pre-Poured Sterile Agar Plates
3 lb Sterile Milo Sorghum Grain Spawn Bag – Injection Port Included
D.V.

Shippment was clean & packaged securely! Product quality is top tier too Love it!

3 lb Sterile Milo Sorghum Grain Spawn Bag – Injection Port Included
Not So Simple Mushroom Substrates
D.V.

Better product compared to the mainstream basics that others sell! 2nd time purchasing & i plan on coming back for more! Solid & consistent!

Not So Simple Mushroom Substrates
5lb Mushroom Milo Sorghum Sterile Grain Bag
j.v.

looks good delivered super fast double bagged
so far so good will find out soon(next review)

5lb Mushroom Milo Sorghum Sterile Grain Bag
14A Unicorn Bag - Mushroom Grow Bags - .5 Micron Gas Exchange Filter Patch
C.C.

Quality products from a trusted source.

14A Unicorn Bag - Mushroom Grow Bags - .5 Micron Gas Exchange Filter Patch
Media Bottles - Borosilicate - Round
C.C.

Always right. Great customer service.

Media Bottles - Borosilicate - Round
Masters Mix Substrate - Premium Blend for Gourmet Mushrooms
Mark

Great

Masters Mix Substrate - Premium Blend for Gourmet Mushrooms
Not So Simple Mushroom Substrate - Advanced Mix for Superior Growth
Brandon

Great and very pleased as i always am ordering with yall.
N theres always a different sticker, love it!!

Not So Simple Mushroom Substrate - Advanced Mix for Superior Growth
2 Pack of 3lb Milo Sorghum Sterile Mushroom Grain Bags
Jeramie

Always the best from Mycology Simplified and one of the kindest people I know runs the whole show. Buy with confidence and have consistent results.

2 Pack of 3lb Milo Sorghum Sterile Mushroom Grain Bags
Sorghum Yeast Agar Plates (SYA) – Pre-Poured Sterile Agar Plates
Lee Roistacher
Killer Plates

Clean, sleek colors and loved by the mycelium

Sorghum Yeast Agar Plates (SYA) – Pre-Poured Sterile Agar Plates
Malt Yeast Activated Charcoal Agar Plates (MYAC) – Pre-Poured Sterile Agar Plates
Charles

I love everything Ive ever ordered from mycology Simplified ! You can count on agar plates being sterile with zero condensation every time. Thanks guys.

Malt Yeast Activated Charcoal Agar Plates (MYAC) – Pre-Poured Sterile Agar Plates
Small Monotub Refill Kit – Sterile Grain Spawn & CVG Substrate
M.D.

everything came a day early and both the spawn bag and substrate bag were individually vaccuum sealed.

Small Monotub Refill Kit – Sterile Grain Spawn & CVG Substrate
5lb Mushroom Milo Sorghum Sterile Grain Bag
Karina

The best quality I have ever bought!

5lb Mushroom Milo Sorghum Sterile Grain Bag
Sorghum Yeast Agar Plates (SYA) – Pre-Poured Sterile Agar Plates
D.V.

Exactly what i needed in quality!

Sorghum Yeast Agar Plates (SYA) – Pre-Poured Sterile Agar Plates