44Q Monotub Bulk Spawn Growing & Casing Kit

44Q Monotub Bulk Spawn Growing & Casing Kit is a beginner-friendly bulk mushroom growing system designed for growers who already have colonized grain spawn and are ready to scale up. This kit makes the transition from jars or spawn bags to bulk growing fast, simple, and reliable.

Built around our Grower’s Select 44-Quart Monotub, this kit provides the ideal balance of airflow, humidity retention, and space for consistent colonization and strong fruiting. Just break up your fully colonized grain spawn, mix it with the included bulk casing mix, and let the monotub do the rest.

Why Growers Choose This Kit

• Designed for Bulk Growing – Perfect for growers moving beyond jars into higher-yield methods.
• Spawn-Ready System – Ideal for use with your own grain spawn or spawn bags.
• Beginner-Friendly Setup – No drilling, measuring, or guesswork required.
• Reusable & Scalable – Clean and reuse the monotub for future grows.
• Optimized for Consistent Results – Dialed-in airflow and humidity support healthy fruiting.

What’s Included

• Custom 44-Quart Monotub – 18" × 15.5" × 12", engineered for optimal airflow and humidity
• 7.5 lbs Select Bulk Casing Mix – Pre-mixed, pasteurized, and hydrated for immediate use
• 1 Quart Vermiculite – Ideal for your final casing layer
• 6 Self-Adhesive Monotub Filter Disks – Allows gas exchange while reducing contamination risk
• 6 Incubation Hole Plugs – Seal airflow ports during colonization
• Custom Black Monotub Liner – Prevents side pinning and simplifies cleanup
• 8 oz Fine Mist Spray Bottle
• Step-by-Step Bulk Growing Guide

How This Kit Works

This kit is designed to be used with fully colonized grain spawn. Once your spawn is ready, simply mix it with the provided bulk casing mix inside the monotub, apply the casing layer, and maintain proper conditions for fruiting.

1. Prepare your grain spawn separately (not included).
2. Break up colonized grain and mix evenly with the bulk casing mix.
3. Apply the vermiculite casing layer.
4. Seal airflow holes with plugs during colonization.
5. Replace plugs with filter disks to initiate fruiting.

Suggested Spawn Amounts

• 1 fully colonized spawn bag
• 2 × 32 oz 5-grain jars
• 2 × 32 oz rye jars
• 3 × 24 oz 5-grain jars
• 6 × half-pint substrate jars
• Or 3–4 quarts of any colonized grain spawn

Why It Works

Our Select Bulk Casing Mix is formulated using premium-grade coco coir and moisture-retentive components mushrooms love. Unlike basic coir blends, this mix arrives fully pasteurized and hydrated—ready to use straight out of the bag. Packed into a single 7.5 lb eco-friendly bag, it reduces plastic waste and simplifies your workflow.

Who This Kit Is Best For

• Growers stepping up from jars to bulk cultivation
• Home cultivators seeking higher yields with less complexity
• Anyone looking for a proven, reusable monotub setup

Important Notes

Grain spawn is not included. This kit is designed for growers who already have colonized spawn or plan to prepare their own. This keeps the kit flexible, affordable, and scalable.

Pairs perfectly with grain spawn bags, liquid culture jars, heat mats, and still air boxes for a complete bulk-growing workflow.

Limited Time Offer: Add a liquid graphite heat mat to this kit for only $12.99 and grow confidently—even in cooler environments.